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Pilularia americana A. Braun. American Pillwort. Phen: Apr-Oct. Hab: Vernal pools and seepage areas on granitic flatrocks, other ponds, drawdown shores of lakes. Dist: This peculiar plant has a puzzling distribution, being known from several disjunct regions: WA to s. CA; NE and MO south to e. and c. TX; SC, GA, TN, AL, and Mexico (Durango and Baja California Norte); similar plants, perhaps conspecific, occur in South America and Africa. The apparently fragmented distribution may be partly explainable by the inconspicuous nature of the plant. First reported for SC in 1993 (J. Allison, pers. comm.).

Origin/Endemic status: Native

Synonymy: = AqW, Ar, ETx1, FNA2, GrPl, K1, K3, K4, Mo1, S13, Sf, Tn, Tx, TxFerns; = n/a – C, RAB

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: OBL
  • Eastern Mountains and Piedmont: OBL
  • Great Plains: OBL
  • Midwest: OBL

Heliophily: 9

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image of plant© Keith Bradley | Original Image ⭷
image of plant© Keith Bradley | Original Image ⭷
image of plant© Alan Cressler: Pilularia americana, Hood Road Flatrock, Walton County, Georgia 3 by Alan Cressler source | Original Image ⭷


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