Elatine americana |
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American waterwort, élatine américaine |
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Habit | Herbs, submersed, 1.5–5 cm. |
Stems | ascending or prostrate, branched. |
Leaves | green; stipules lanceolate, 0.5–0.6 mm, margins dentate, apex acute; petiole 0.5–3 mm; blade obovate to broadly spatulate, 3–8 × 0.5–3.5 mm, base attenuate or cuneate, apex rounded to shallowly emarginate. |
Pedicels | to 0.1 mm, erect. |
Flowers | cleistogamous when submersed; sepals (2–)3, equal or 1 reduced, oblong-ovate or widely lanceolate, 0.5 × 0.3–0.5 mm; petals 3, greenish white or pinkish white to reddish, elliptic or ovate, 0.6–1.2 × 0.5 mm; stamens 3; styles 3. |
Capsules | oblong-ovoid, 3-locular, 1.5 mm diam. |
Seeds | 9–12 per locule, slenderly cylindric, ± straight, 0.4–0.6 × (0.1–)0.2 mm; pits angular-hexagonal, length 2–3 times width, in 6(–8) rows, (13–)16–25(–30) per row. |
2n | = 36. |
Elatine americana |
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Phenology | Flowering summer–early fall. |
Habitat | Muddy shorelines including estuaries, in water to 50 cm deep. |
Elevation | 0–300(–900) m. (0–1000(–3000) ft.) |
Distribution |
CA; CT; DE; IL; MA; ME; MI; MN; MO; MT; NC; NH; NJ; NY; OK; PA; RI; SD; VA; MB; NB; NT; ON; QC
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Source | FNA vol. 12, p. 352. |
Parent taxa | Elatinaceae > Elatine |
Sibling taxa | |
Synonyms | Peplis americana, E. triandra subsp. americana, E. triandra var. americana |
Name authority | (Pursh) Arnott: Edinburgh J. Nat. Geogr. Sci. 1: 431. (1830) |
Web links |
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