Pediomelum cuspidatum |
Pediomelum castoreum |
|
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largebract Indian breadroot, tallbread scurfpea |
beaver dam breadroot, beaver Indian breadroot, Indian breadroot |
|
Habit | Herbs caulescent, to 100+ cm, mostly glandular throughout, strigose becoming glabrate. | Herbs acaulescent or subacaulescent, to 16 cm, glandular (with obvious blond to dark brown glands) on leaflets, less so on bracts and stipules, mostly silver-strigose throughout. |
Stems | 1+, decumbent to erect-ascending, much branched, leaves dispersed along stems; pseudoscapes rarely branched, 0–14 cm; cataphylls 0–13 mm. |
short-erect, sometimes with proximal, decumbent lateral stems to 25 cm, unbranched or sparsely branched, leaves appearing clustered at base or alternate along short stem, with clusters of leaves or inflorescences distally; pseudoscapes to 10(–14) cm; cataphylls 5–20 mm, glabrous or strigose. |
Leaves | palmately 3–5-foliolate; stipules persistent, erect to reflexed, linear-lanceolate to lanceolate, 6–15 × 1–5 mm, glandular, pubescent; petiole enlarged but not jointed basally, often canaliculate, 5–40 mm, sparsely strigose; petiolules 1.5–3.5 mm; leaflet blades oblanceolate to elliptic, oblong, or obovate, 2–4.8 × 0.5–2 cm, base cuneate, apex acute to obtuse or apiculate, surfaces abaxially pubescent, adaxially glabrous. |
usually palmately, rarely pseudopalmately, (3–)5 or 6-foliolate; stipules persistent, triangular or lanceolate to narrowly oblong, 5–13.5 × 2–5 mm, pubescent; petiole slightly enlarged and jointed basally, slightly canaliculate, (30–)65–150 mm; petiolules 1.5–2.5 mm; leaflet blades oblanceolate or orbiculate to elliptic, (1.5–)2–4.5 × (1.5–)2.3–4 cm, base attenuate, apex broadly acute to rounded or retuse, surfaces abaxially gray-green and pubescent, adaxially yellow-green and sparsely pubescent along veins to pubescent, not white-veined. |
Inflorescences | persistent, ellipsoid to elongate; rachis 1.5–8.5 cm, nodes (2–)6–17, 3 flowers per node, internodes to 13 mm; bracts persistent, erect to reflexed, lanceolate, 4–17 × 1–6 mm, glandular, pubescent. |
disjointing in age at peduncle base, ellipsoid to ovoid; rachis 1.5–1.6 cm, elongating to 2–5.5 cm in fruit, nodes 3–11, 2 or 3 flowers per node; bracts tardily deciduous or persistent, narrowly elliptic or spatulate to oval, 3.5–8 × 3–7 mm, pubescent. |
Peduncles | 0.6–15 cm, longer than subtending petiole, strigose. |
(1.5–)2.4–7 cm, shorter than subtending petiole, appressed-spreading pubescent. |
Pedicels | 2–3 mm. |
0–2 mm. |
Flowers | 12–22 mm; calyx strongly gibbous-campanulate in fruit, 9–15 mm abaxially, 8–12 mm adaxially, glandular, pubescent; tube 4–5.5 mm; abaxial lobe lanceolate to elliptic, 8–19 × 2–3.5 mm, adaxial lobes lanceolate, 4–7 × 1–1.5 mm; corolla blue, purple, or violet, banner broadly oblanceolate to obovate, 13–21 × 7–8 mm with claw 4–6 mm, wings 12–18.5 × 3–4 mm with claw 4–7.5 mm, keel 9–13 × 4–7 mm with claw 2.5–3 mm; filaments 8–12 mm; anthers elliptic, 0.5–0.6 mm; ovary glabrous or pubescent and glandular on distal 1/4–1/3, style pubescent basally. |
9–13 mm; calyx gibbous-campanulate in fruit, 10–12 mm abaxially (elongating to 20 mm in fruit), 9–10.5 mm to adaxial lobe (elongating to 14 mm in fruit), usually eglandular, strigose to setose; tube 3–4 mm; abaxial lobe broadly oblanceolate, 4–5 × 4–4.5 mm, often with 3 prominent veins, adaxial lobes linear, 4–5 × 1–1.5 mm; corolla ochroleucous with purple tinge to purple, banner usually elliptic, 9–13 × 3.5–5 mm with claw 2–4 mm, wings 10–13 × 2 mm with claw 4–4.5 mm, keel 6.5–8 × 2 mm with claw 3–4 mm; filaments 6–7.5 mm; anthers elliptic, 0.4 mm; ovary pubescent apically, style glabrous, sometimes pubescent basally. |
Legumes | ovoid to obovate, 6–8 × 4–4.5 mm, glandular, pubescent distally, beak 1.5–2 mm, shorter than calyx. |
ellipsoid to ovoid, 6–8 × 5–6 mm, eglandular, strigose, beak 8–11(–15) mm, equal to or longer than calyx. |
Seed | reddish brown, reniform to globose, 3.5–4 × 4.5–5 mm. |
gray-green to dark brown, narrowly reniform, 5.5–6 × 3.5–4 mm, rugose, dull. |
Pediomelum cuspidatum |
Pediomelum castoreum |
|
Phenology | Flowering spring–summer. | Flowering spring. |
Habitat | Grasslands, meadows, woodlands. | Sand or sandy soils, open desert scrub communities. |
Elevation | 50–1500 m. (200–4900 ft.) | 400–1000 m. (1300–3300 ft.) |
Distribution |
CO; KS; MT; NE; OK; SD; TX
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AZ; CA; NV |
Discussion | Pediomelum cuspidatum is one of the larger species in the genus, in spite of its procumbent habit with erect-ascending, copious lateral branches. Horizontal stems are often bicolored, purple adaxially and light green abaxially. It is variable, particularly in plant height, flower length, and inflorescence length. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Pediomelum castoreum is known from Mohave County in Arizona, San Bernardino County in California, and Clark and Lincoln counties in Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Pediomelum | Fabaceae > subfam. Faboideae > Pediomelum |
Sibling taxa | ||
Synonyms | Psoralea cuspidata | Psoralea castorea |
Name authority | (Pursh) Rydberg in N. L. Britton et al.: N. Amer. Fl. 24: 19. (1919) | (S. Watson) Rydberg in N. L. Britton et al.: N. Amer. Fl. 24: 22. (1919) |
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