IUCN threat status:

Least Concern (LC)

Morphology

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Description

Plants 40–50(–100) cm. Stem hollow, branched, rooting at basal nodes. Submerged leaves 3–4-pinnate; ultimate segments linear. Aerial leaves 1-pinnate; pinnae 4–9(–15) pairs, basal pairs remote, sessile, ovate-lanceolate or oblong, 1.5–5(–7) ×  0.8–2.5(–3) cm, base obliquely truncate, usually with 1 lobe at basal edge, margins serrate or irregularly incised. Upper leaves smaller, sheaths expanded. Umbels 4–6 cm across; bracts 3–6, oblong or lanceolate, 6–21 mm, entire or incised; rays 5–15 (–20), 2–3 cm, unequal; bracteoles 5–8, 1.5–5 mm, unequal, usually entire, nearly as long as or longer than the pedicels; umbellules 10–20-flowered; pedicels 2–5 mm, unequal. Calyx teeth 0.4–0.8 mm. Fruit 2–2.2 × 1.5–2 mm. Fl. May–Jun, fr. Jul–Aug.

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Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA

Source: Missouri Botanical Garden

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