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beak streptanthella, fiddle mustard, long beak twist flower, long-beak fiddle mustard, longbeak streptanthella, streptanthella

Stems

often several, ascending distally, (1.2–)2–6(–7.5) dm.

Basal leaves

soon withered.

Cauline leaves

shortly petiolate or (distal) sessile;

blade lanceolate to oblanceolate, or (distal) linear, 2–5.5(–6.5) cm × 3–10(–15) mm, (attenuate to petiolelike base), margins entire, dentate to sinuate, or pinnatifid, (distal cauline (1–)1.7–5.8(–7) cm × (0.7–)1.5–4(–7) mm, base cuneate to attenuate, margins entire, apex obtuse to acute).

Flowers

sepals (2–)2.5–4(–5) × 0.7–1.5 mm;

petals (3.5–)4–6(–7) × 0.7–1.1 mm, claw oblanceolate, 3–5 mm (longer than blade);

filaments with at least dorsal pair exserted, (longest pair) 3–6 mm;

anthers 0.5–1(–1.3) mm.

Fruiting pedicels

usually curved, rarely straight, (1–)2–5(–7) mm.

Fruits

slightly to strongly reflexed, sometimes secund, (2.5–)3.5–6(–7) cm × 1.5–2(–2.2) mm;

valve apex adnate with style and replum, forming indehiscent tip, often 1-seeded;

style (2–)3.5–6(–8) mm.

Seeds

light brown, 2–3 × 1–1.7(–2) mm;

wing 0.3–0.7 mm wide.

2n

= 28.

Streptanthella longirostris

Phenology Flowering early Jan-late Jun.
Habitat Roadsides, rocky areas, sandy ridges, sagebrush and creosote bush deserts, dry slopes, dry washes, decomposed granitic soil, pinyon-juniper areas, alluvial fans, chaparral, sandstone gravel and outcrops, sandstone hills and cliffs
Elevation 60-2200 m (200-7200 ft)
Distribution
from FNA
AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; Mexico (Baja California, Sonora)
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Discussion

Streptanthella longirostris is most widely distributed in southern California, Nevada, and southern and central Utah, and appears to be restricted elsewhere: Colorado (Mesa, Montezuma, Montrose, San Miguel), Idaho (Butte), Montana (Carbon), New Mexico (San Juan), Washington (Franklin, Grant), and Wyoming (Fremont, Natrona, Sweetwater, Uinta).

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

Source FNA vol. 7, p. 700.
Parent taxa Brassicaceae > tribe Thelypodieae > Streptanthella
Synonyms Arabis longirostris, Euklisia longirostris, Guillenia rostrata, S. longirostris var. derelicta, Streptanthus longirostris, Thelypodium longirostris
Name authority (S. Watson) Rydberg: Fl. Rocky Mts., 364. (1917)
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