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meadow lotus, riverbar lotus

Habit Plants annual, glabrous or hirsute, often glaucous.
Stems

1–5, decumbent to erect, 0.5–4 dm.

Leaves

subpinnately, pinnately or palmately compound;

leaflets 2–4, often 1 or 2 on one side of the rachis and 2 terminal, elliptic to obovate;

margins entire or denticulate;

tips acute to obtuse;

surfaces hirsute;

rachises 5–12 mm, flattened, petiolate.

Inflorescences

1–2-flowered;

bracts 0; ± sessile.

Flowers

calyces 3–5 mm;

tubes hirsute or glabrous;

lobes subulate; ~1.5 × tube length;

corollas 5–8 mm, cream white, or pink to pale yellow;

banners purple-tinged;

keel tips yellowish.

Fruits

dehiscent; erect or spreading; straight, widely oblong, 8–20 × 1–4 mm; tawny;

tips abruptly downward angled and curved, strigose or glabrous.

Seeds

2–4, gray, faintly mottled.

2n

=14.

Acmispon denticulatus

Distribution
[WildflowerSearch map]
[BONAP county map]
Discussion

Roadsides, fields, slopes, gravel bars, meadows. Flowering May–Aug. 50–1600 m. BW, CR, ECas, Lava, Sisk, WV. CA, ID, WA; north to British Columbia, southeast to UT. Native.

Source Flora of Oregon, volume 2, page 651
Richard Halse
Sibling taxa
A. americanus, A. brachycarpus, A. nevadensis, A. parviflorus, A. wrangelianus
Synonyms Hosackia denticulata, Lotus denticulatus
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