Stanleya confertiflora
(B.L. Rob.) Howell
Family:
Brassicaceae
Biennial Prince's-Plume
FNA
Resources
Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
Annuals or biennials;
(glaucous), glabrous throughout.
Stems
erect, unbranched, (slightly ribbed), 2-6(-8) dm.
Basal leaves
(often withered by flowering); blade obovate to ovate, margins entire.
Cauline leaves
sessile; blade (fleshy), lanceolate, (2.2-)4-13(-16) cm × (5-)10-30(-40) mm, (smaller distally, base auriculate to sagittate), margins entire.
Racemes
dense, (slightly or not elongated in fruit).
Fruiting pedicels
horizontal to divaricate-ascending, 10-20(-26) mm.
Flowers:
sepals oblong-linear, 6-12 mm; petals yellow becoming whitish, narrowly linear to filiform, (12-)14-25 × 0.5-1.5 mm, (margins crisp), claw (nearly linear), 5-11 mm, slightly wider at base; filaments 12-17 mm; anthers 3-4.5 mm; gynophore (6-)10-18 mm.
Fruits
suberect to divaricate-ascending, slightly curved inward, (torulose), subterete, 2-5.2(-6) cm × 1.5-2.2 mm; ovules 40-62 per ovary; style 0.6-1.7 mm.
Seeds
oblong, 1.5-2.5 × 0.8-1 mm.
Flowering Apr-Jun. Barren clay slopes in sagebrush communities, heavy clay flats, loose soil mounds, dry sandy grounds, alkaline meadows and flats; of conservation concern; 600-1500 m; Idaho, Oreg.
Stanleya confertiflora
is distributed in Gooding, Owyhee, and Washington counties in Idaho, and in Baker, Harney, and Malheur counties in Oregon.
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