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Horsetails |
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Botanical Name:
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Equisetum arvense |
Common Name: |
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Common Horsetail |
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Habitat: |
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Dry or wet soil, fields, woods and swamps |
Spores found: |
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Apr.14-June 4. |
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State Status: |
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SC |
Sites in State: |
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— |
Counties w/sites |
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All |

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Upper photo credit: Robbin Moran, NY Botanical Garden.
Lower photo credit: Jan De Laet, plantsystematics.org
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Botanical Name:
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Equisetum fluviatile |
Common Name: |
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Water Horsetail |
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Habitat: |
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In water, marshes, ponds |
Spores found: |
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May(8-)25-July 4(-19) |
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State Status: |
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SC |
Sites in State: |
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3 |
Counties w/sites |
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Providence, Washington |
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Photo credits: Robbin Moran, NY Botanical Garden.
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Botanical Name:
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Equisetum hyemale ssp. affine |
Common Name: |
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Smooth Scouring Rush |
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Habitat: |
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Dry or moist soil, roadsides, stream banks |
Spores found: |
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May(15-)19-Sept.2(-Oct.5) |
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State Status: |
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SC |
Sites in State: |
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7 |
Counties w/sites |
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Providence, Kent, Washington |

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Upper photo credit: By Kondidresher (zdjęcie własne) [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
Lower photo credit: By Caromallo (Own work) [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons |
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Botanical Name:
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Equisetum sylvaticum |
Common Name: |
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Woodland Horsetail |
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Habitat: |
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Moist woods and swampy areas |
Spores found: |
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(June21-)July11-Aug.12(-20) |
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State Status: |
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SC |
Sites in State: |
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10 |
Counties w/sites |
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Providence, Bristol, Washington |
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Photo credits: Robbin Moran, NY Botanical Garden.
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Botanical Name:
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Equisetum variegatum |
Common Name: |
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Variegated Horsetail |
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Habitat: |
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Moist sandy soil |
Spores found: |
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June-Sept |
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State Status: |
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SE |
Sites in State: |
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1 |
Counties w/sites |
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Kent (?) |
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Photo credits: Robbin Moran, NY Botanical Garden.
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Clubmosses |
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Botanical Name:
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Dendrolycopodium hickeyi |
Common Name: |
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Hickey's Tree Clubmoss |
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Habitat: |
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Hardwood forests in acid soil. |
Spores found: |
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— |
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State Status: |
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C |
Sites in State: |
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Counties w/sites |
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All |
Photo credit: Robbin Moran, NY Botanical Garden. |
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Botanical Name:
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Dendrolycopodium obscurum |
Common Name: |
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Flat-branched Clubmoss or Prince's Pine |
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Habitat: |
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Hardwood forests, also sometimes in dry open areas. |
Spores found: |
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July 5-Oct.13 |
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State Status: |
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C |
Sites in State: |
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Counties w/sites |
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All |
Photo credit: Robbin Moran, NY Botanical Garden. |
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Botanical Name:
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Diphasiastrum digitatum |
Common Name: |
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Southern Ground Cedar or Creeping Jenny |
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Habitat: |
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Dry woods. |
Spores found: |
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Aug.20-.Sept.19 |
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State Status: |
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C |
Sites in State: |
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Counties w/sites |
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All |
By Jaknouse [CC-BY-SA-3.0 (http://creativecommons.org/licenses/ by-sa/3.0)], via Wikimedia Commons
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Botanical Name:
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Diphasiastrum tristachyum |
Common Name: |
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Blue or Wiry Ground Cedar |
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Habitat: |
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Dry, acid woods. |
Spores found: |
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July(7-)18-Oct.13 |
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State Status: |
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F |
Sites in State: |
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— |
Counties w/sites |
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All |
Photo credit: kbarton |
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Botanical Name:
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Lycopodiella alopecuroides |
Common Name: |
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Fox-tail Clubmoss |
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Habitat: |
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Wet sandy areas and bogs |
Spores found: |
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July-Oct. |
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State Status: |
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SE |
Sites in State: |
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3 |
Counties w/sites |
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Providence, Kent, Washington |
Photo credit: Robbin Moran, NY Botanical Garden.
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Botanical Name:
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Lycopodiella appressa |
Common Name: |
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Apressed or Bog Clubmoss |
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Habitat: |
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Bogs, borrow pits, wet sandy soil. |
Spores found: |
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— |
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State Status: |
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R |
Sites in State: |
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Counties w/sites |
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Providence |
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Photo credits: Robbin Moran, NY Botanical Garden.
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Botanical Name:
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Lycopodiella inundata |
Common Name: |
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Northern Bog Clubmoss |
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Habitat: |
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Bogs, marshes, wet sands. |
Spores found: |
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July 20-Nov.12. |
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State Status: |
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U |
Sites in State: |
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Counties w/sites |
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All |
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Photo credits: Robbin Moran, NY Botanical Garden. |
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Botanical Name:
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Lycopodium clavatum |
Common Name: |
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Staghorn Clubmoss |
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Habitat: |
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Moist woods and swamps. |
Spores found: |
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July 2-Sept.20 |
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State Status: |
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C |
Sites in State: |
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— |
Counties w/sites |
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All |
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Photo credits: Robbin Moran, NY Botanical Garden.
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Botanical Name:
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Lycopodium lagopus |
Common Name: |
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One-cone Clubmoss |
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Habitat: |
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Open woods. |
Spores found: |
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July 2-Sept. 20. |
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State Status: |
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SE |
Sites in State: |
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1 |
Counties w/sites |
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Providence |
Photo Credit: © Francis R. Underwood 2015
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Botanical Name:
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Spinulum annotinum |
Common Name: |
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Bristly or Stiff Clubmoss |
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Habitat: |
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Coniferous woods. |
Spores found: |
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(June2-) July2-Sept.26 (-Oct.13) |
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State Status: |
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SE |
Sites in State: |
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1 |
Counties w/sites: |
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Providence |
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Photo credits: Robbin Moran, NY Botanical Garden.
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Fir-mosses |
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Botanical Name:
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Huperzia lucidula |
Common Name: |
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Shining Club Moss |
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Habitat: |
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Moist woods. |
Spores found: |
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June 25-Nov. |
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State Status: |
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C |
Sites in State: |
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Counties w/sites |
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All |
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Photo credits: Robbin Moran, NY Botanical Garden.
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Spike-mosses |
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Botanical Name:
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Selaginella apoda |
Common Name: |
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Meadow Spike-moss or Footless Spike-moss |
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Habitat: |
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Wet meadows, swamps, stream banks |
Spores found: |
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7/16-10/18 |
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State Status: |
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R |
Sites in State: |
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4 |
Counties w/sites |
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Kent, Newport, Providence, Washington |
Photo credit: Robbin Moran, NY Botanical Garden.
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Botanical Name:
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Selaginella rupestris |
Common Name: |
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Rock Spike-moss |
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Habitat: |
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Dry soil on rocky outcroppings |
Spores found: |
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(4/27) 5/3-9/19 (10/8) |
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State Status: |
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SC |
Sites in State: |
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3 |
Counties w/sites |
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Newport, Providence, Washington |
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Photo credits: Robbin Moran, NY Botanical Garden.
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Quillworts |
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Botanical Name:
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Isoetes echinospora |
Common Name: |
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Pointed or Spiny-spored Quillwort |
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Habitat: |
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Usually submerged plant of cool acid water in sand or mud. |
Spores found: |
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June (2-)28-Oct. 6(-12) |
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State Status: |
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SC |
Sites in State: |
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2 |
Counties w/sites |
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Providence, Kent |

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Photo 1: W. Carl Taylor. USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento. Courtesy of USDA NRCS Wetland Science Institute. [Public domain], via Wikimedia Commons
Photo 2: Robbin Moran, NY Botanical Garden. Comparison of Isoetes echinospora (left) and I. tuckermanii (right). The latter species has pale reddish leaves and more recurved leaves. |
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Photo 3: Robbin Moran, NY Botanical Garden. Megaspores of Isoetes echinospora (left) and I. riparia (right).
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Photo 4: By Neuchâtel Herbarium (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons |
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Botanical Name:
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Isoetes engelmannii |
Common Name: |
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Engelmann's Quillwort |
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Habitat: |
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Usually submerged plant of fresh water with muddy shores |
Spores found: |
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June 22-Oct. |
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State Status: |
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SC |
Sites in State: |
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2 |
Counties w/sites |
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Providence, Kent |
Photo credit: W. Carl Taylor. USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species. Northeast National Technical Center, Chester. Courtesy of USDA NRCS Wetland Science Institute. [Public domain], via Wikimedia Commons
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Botanical Name:
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Isoetes lacustris |
Common Name: |
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Lake Quillwort |
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Habitat: |
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Submerged plant of acid waters |
Spores found: |
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July-Sept. |
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State Status: |
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R |
Sites in State: |
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— |
Counties w/sites |
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— |

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From top—
photos 1 and 2: Robbin Moran, NY Botanical Garden.
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Photo 3: By W. Carl Taylor. USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species. Northeast National Technical Center, Chester. Courtesy of USDA NRCS Wetland Science Institute. [Public domain], via Wikimedia Commons |
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Photo 4: Robbin Moran, NY Botanical Garden. Megaspores showing trilete markings on the proximal face.
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Botanical Name:
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Isoetes riparia |
Common Name: |
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River or Shore Quillwort |
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Habitat: |
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Usually submerged plant of fresh or brackish water in gravel or mud |
Spores found: |
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July-Sept. |
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State Status: |
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SC |
Sites in State: |
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4 |
Counties w/sites |
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Providence, Kent |
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Top and center photos: Ann Larson, Missouri Botanical Garden. |
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Bottom photo: Robbin Moran, NY Botanical Garden. Megaspores of Isoetes echinospora (left) and I. riparia (right) |
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Botanical Name:
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Isoetes tuckermanii |
Common Name: |
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Tuckerman's Quillwort |
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Habitat: |
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Submerged plant of acid water with sandy shores |
Spores found: |
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(June 10-)July 10-Oct 15 |
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State Status: |
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Rare |
Sites in State: |
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1 |
Counties w/sites |
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Providence |

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Top photo: Robbin Moran, NY Botanical Garden.
Center photo: Robbin Moran, NY Botanical Garden. Comparison of Isoetes echinospora (left) and I. tuckermanii (right). The latter species has pale reddish leaves and more recurved leaves.
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Bottom photo: Ann Larson, Missouri Botanical Garden.
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No image
available
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Botanical Name:
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Isoetes x eatonii |
Common Name: |
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Eaton’s Quillwort |
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Habitat: |
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Submerged plant of acid water with sandy shores |
Spores found: |
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State Status: |
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SH |
Sites in State: |
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0 (1942) |
Counties w/sites |
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Providence |
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