Flora of North America species comparison

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Alisma subcordatum

alisma subcorde, American water plantain, southern water-plantain
Habit Herbs, to 6 dm.
Leaves

emersed, rarely floating, petiolate;

blade ovate to elliptic, to 15 × 10 cm.
Inflorescences

to 1 m. Flowers chasmogamous;

sepals 1.5–2.5(–6) mm;

petals white, 1–3 mm, margins slightly erose, apex mostly acuminate;

anthers rounded, 0.4–0.6 mm;

style ± curved, 0.2–0.4 mm, ¼ length ovary.
Fruiting

heads 2–4 mm diam;

achenes obliquely ovoid, 1.5–2.2 mm, abaxially rounded, with 1 abaxial groove;

beak ascending.
2n

=14.

Alisma subcordatum
Phenology Flowering spring–fall.
Habitat Shallow ponds, stream margins, marshes, and ditches
Elevation 50–1500 m (200–4900 ft)
Distribution
from FNA
AL; AR; CO; CT; DC; DE; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; ND; NE; NH; NJ; NY; OH; OK; PA; RI; SC; SD; TN; TX; VA; VT; WI; WV; NB; ON; QC; Mexico
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 22.
Parent taxa Alismataceae > Alisma
Sibling taxa
A. gramineum, A. lanceolatum, A. plantago-aquatica, A. triviale
Synonyms A. parviflorum, A. plantago-aquatica var. parviflorum
Name authority Rafinesque: Medical Repository hexade 2, 5:354. (1808)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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