What’s a dichotomous key?
Help
Alisma
See list of 3 species in this genus-
1a. Leaves linear, 0.2–2 (–3) cm wide; abaxial edge of achenes with 2 grooves; style ± coiled
-
1b. Emersed leaves with narrow-lanceolate to ovate blades 3–12 cm wide; abaxial edge of achenes with a single groove; style merely curved
-
2a. Achenes 1.8–3 mm long; petals 3.8–4.5 ×3–3.9 mm, noticeably longer than the sepals; styles 0.4–0.6 mm long
-
2b. Achenes 1.5–2.2 mm long; petals 1.8–2.5 ×1.4–2 mm, scarcely, if at all, longer than the sepals; styles 0.2–0.4 mm long
-
Show photos of:
Each photo represents one species in this genus.