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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
from FNA
CO; KS; MT; NE; OK; SD; TX
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; NV
[BONAP county map]
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
P. argophyllum, P. aromaticum, P. californicum, P. canescens, P. castoreum, P. cyphocalyx, P. digitatum, P. epipsilum, P. esculentum, P. humile, P. hypogaeum, P. latestipulatum, P. linearifolium, P. megalanthum, P. mephiticum, P. palmeri, P. pariense, P. pentaphyllum, P. piedmontanum, P. reverchonii, P. rhombifolium, P. subacaule, P. tenuiflorum, P. verdiense
P. argophyllum, P. aromaticum, P. californicum, P. canescens, P. cuspidatum, P. cyphocalyx, P. digitatum, P. epipsilum, P. esculentum, P. humile, P. hypogaeum, P. latestipulatum, P. linearifolium, P. megalanthum, P. mephiticum, P. palmeri, P. pariense, P. pentaphyllum, P. piedmontanum, P. reverchonii, P. rhombifolium, P. subacaule, P. tenuiflorum, P. verdiense
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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