Elatine rubella |
Elatine heterandra |
|
---|---|---|
red-stem waterwort, Southwestern waterwort, three-flower waterwort |
mosquito waterwort |
|
Habit | Herbs, emergent on wet substrates, 1–6(–16) cm. | Herbs, emersed on wet substrates, 0.5–3 cm. |
Stems | ascending or prostrate, branched. |
ascending or prostrate, branched. |
Leaves | reddish green; stipules lanceolate, 0.5–0.6 mm, margins dentate, apex acute; petiole 0.5–1(–3) mm; blade oblong-lanceolate, 3–8 × (0.5–)1–2(–2.2) mm, base attenuate to rounded, apex obtuse to slightly emarginate. |
usually green, sometimes reddish green; stipules ovate-lanceolate, 1 mm, margins irregularly toothed, apex acute; petiole 0.5–2 mm; blade obovate to broadly elliptic-oblong, 2–4 × 0.5–1.5 mm, base usually cuneate, sometimes rounded, apex acute to obtuse, notched. |
Pedicels | 0–0.5 mm, erect. |
absent. |
Flowers | sepals (2–)3, if 2, equal, if 3, 1 smaller, oblong-ovate or widely lanceolate, 1–1.5 × 1–1.5 mm; petals 3, pinkish white to reddish, elliptic or ovate, 1–1.5 × 0.5 mm; stamens 3; styles 3. |
sepals 2(–3), if 2, equal, if 3, 1 smaller, oblong, 1.1–1.3 × 0.3 mm; petals 3, pinkish, elliptic to ovate, 1–1.5 × 0.5 mm; stamens 1–6 (number variable within plant); styles 3. |
Capsules | oblong-ovoid, 3-locular, 1.5–2.5 mm diam. |
globose, 3-locular, 1.1–1.7 mm diam. |
Seeds | 10–20(–30) per locule, narrowly oblong, straight or curved to 15°, 0.5–0.7 × 0.1–0.3 mm; pits angular-hexagonal, length 1–2 times width, in 8–10 rows, 16–25(–30) per row. |
8–12 per locule, broadly ellipsoid to oblong, straight or curved 15–30°, 0.3–0.5 × 0.1–0.2 mm; pits rounded-hexagonal, length 1–2 times width, in 9–10 rows, 12–18 per row. |
Elatine rubella |
Elatine heterandra |
|
Phenology | Flowering summer. | Flowering summer. |
Habitat | Muddy shores, shallow vernal pools, ditches, rice fields. | Wet mud of montane ponds. |
Elevation | 0–2900 m. (0–9500 ft.) | (400–)1000–1500 m. ((1300–)3300–4900 ft.) |
Distribution |
AZ; CA; CO; ID; KS; MT; NE; NM; NV; OR; SD; UT; WY
|
CA; NM; TX |
Discussion | Reports of Elatine rubella from southern British Columbia and Washington are based on misidentifications of E. brachysperma and E. chilensis, respectively. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
In California, Elatine heterandra is known from the North Coast Ranges and the Sierra Nevada; additionally, two disjunct localities are known for the species in McKinley County, New Mexico, and Kenedy County, Texas. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 352. | FNA vol. 12, p. 353. |
Parent taxa | Elatinaceae > Elatine | Elatinaceae > Elatine |
Sibling taxa | ||
Name authority | Rydberg: Mem. New York Bot. Gard. 1: 260. (1900) | H. Mason: Madroño 13: 240. (1956) |
Web links |