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Published In: A Flora of North America: containing . . . 1(1): 77–78. 1838. (Fl. N. Amer.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 7/24/2009)

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11. Streptanthus cordatus Nuttall in Torrey & A. Gray, Fl. N. Amer. I: 77. 1838.

     Herbs, perennial, glabrous throughout except for petioles of basal leaves and sometimes sepals, glaucous; caudex simple or few branched. Stems (1–)3–9(–11) dm, simple or few branched. Basal leaves rosulate, with broadly winged, setose-ciliate petioles, spatulate to obovate, rarely narrowly oblanceolate, 1.5–8(–11) cm, dentate at least distally; middle cauline leaves broadly oblong to ovate or suborbicular to lanceolate, 2–9 x 0.7–4.5(–6) cm, sessile, auriculate to amplexicaul, entire or few-toothed, rounded or acute to acuminate at apex, not overlapping; upper leaves smaller in size, reduced. Racemes ebracteate, lax, without a terminal cluster of sterile flowers; fruiting pedicels divaricate-ascending, straight, 3–11(–14) mm. Flowers: sepals forming campanulate calyx, greenish brown to purple, lateral pair basally subsaccate, broadly oblong, 5–12 mm, not keeled, glabrous or subapically bristly; petals purple to brownish, 9–15 mm; blade 2–6 x 0.7–1 mm, recurved or not, not crisped; claw purplish, 7–10 mm, wider than blade; filaments in 3 pairs of unequal length, free; adaxial pair 7.5–10 mm; abaxial pair 5–7 mm; lateral pair 4–5 mm; anthers of all stamens fertile, 2.5–5 mm. Fruits 5–10.5(–14.5) cm x (2.5–)3–6(–7) mm, ascending to divaricate-ascending, flattened, straight, not torulose; valves glabrous, with a distinct midvein; gynophore 0.5–1.5 mm; replum straight; style 0.2–3 mm; stigma slightly to prominently 2-lobed; ovules and seeds 20–38(–46) per fruit. Seeds broadly oblong to suborbicular, 2.5–5 x 2.2–5 mm; wing continuous, 0.1–0.9 mm wide.

Flowering: Apr–Jul.

Habitat: dry stony slopes, sandy draws, limestone ledges, gravelly knolls, pinyon-juniper woodlands, sagebrush, open pine forests; open chaparral, cypress woodland.

Elevation: 500–3100 m.

Distribution: United States (Arizona, California, Colorado, Idaho, New Mexico, Nevada, Oregon, Utah, Wyoming).

Two varieties, W United States.



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                                          Key to the varieties of Streptanthus cordatus

1. Middle cauline leaves ± rounded to obtuse at apex, broadly oblong to ovate or

     suborbicular; basal leaves obovate to spatulate, obtuse or rounded at apex.................. 11a. var. cordatus

1. Middle cauline leaves acuminate or acute at apex, lanceolate; basal leaves narrowly 

    oblanceolate, acuminate at apex   ................................................................................ 11b. var. piutensis



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