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heterodraba, ladiestongue mustard, spreading athysanus

Habit Plants pubescent.
Stems

(0.3–)0.7–2.5(–3.5) dm.

Basal leaves

subsessile or petiole to 0.3 cm;

blade oblanceolate, obovate, or oblong, (0.3–)0.7–2(–2.2) cm × (2–)4–7 mm, margins entire or with a tooth on each side, apex obtuse, surfaces uniformly pubescent, trichomes cruciform with fewer, 3-rayed ones.

Cauline leaves

2–5;

blade similar to but smaller than basal, (base cuneate, not auriculate).

Flowers

sepals 0.6–1 × 0.4–0.6 mm;

petals spatulate, 1.3–1.7 × 0.5–0.8 mm;

filaments 0.5–0.9 mm;

anthers 0.1–0.2 mm.

Fruiting pedicels

stout, 1–2(–3) mm.

Fruits

elliptic, obovate, or orbicular, flattened or slightly twisted;

valves thickened, veins often prominent, glabrous or uniformly pubescent, trichomes subsessile or short-stalked, cruciform and 3-rayed, sometimes mixed with stouter, simple or forked, subsetiform ones to 0.6 mm, not hooked;

septum complete, (membranous);

ovules 6–12 per ovary;

style 0.1–0.2 mm.

Seeds

often 2 or more, 0.9–1.2 × 0.6–0.8 mm.

Athysanus unilateralis

Phenology Flowering Feb–May.
Habitat Open grassy slopes and flats, friable clay, flood plains, adobe and heavy gumbo clay, gypsum clay slopes
Elevation 100-900 m (300-3000 ft)
Distribution
from FNA
CA; OR; Mexico (Baja California)
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[BONAP county map]
Discussion

It appears that Athysanus unilateralis is known in Oregon only from Jackson County; it is more widespread in California.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 7, p. 268.
Parent taxa Brassicaceae > tribe Arabideae > Athysanus
Sibling taxa
A. pusillus
Synonyms Draba unilateralis, Heterodraba unilateralis
Name authority (M. E. Jones) Jepson: Fl. W. Calif., 224. (1901)
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