Pediomelum cuspidatum |
Pediomelum canescens |
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largebract Indian breadroot, tallbread scurfpea |
buckroot |
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Habit | Herbs caulescent, to 100+ cm, mostly glandular throughout, strigose becoming glabrate. | Herbs caulescent, to 100 cm, mostly glandular throughout and strigose or canescent. |
Stems | 1+, decumbent to erect-ascending, much branched, leaves dispersed along stems; pseudoscapes rarely branched, 0–14 cm; cataphylls 0–13 mm. |
usually 1, rarely 2, erect, unbranched proximally to much branched distally, leaves dispersed along distal branches; pseudoscapes 0; cataphylls 6–11 mm (when present), glabrous. |
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. |
palmately 1 or 3-foliolate; stipules absent; petiole not swollen or jointed basally, slightly canaliculate, (0 or)2–6(–10) mm, usually shorter than petiolule, rarely to 1 mm longer, strigose; petiolules often adnate to leaf spur, 5–9 mm; leaflet blades broadly elliptic to obovate or oblanceolate to orbiculate, 3–5 × 2–3.2 cm, base attenuate, apex acute to rounded, surfaces abaxially densely canescent, adaxially glabrous or glabrate. |
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. |
persistent, loose, much of rachis exposed, ovoid-ellipsoid or shortly elongate; rachis loose, 1.5–5.5 cm, elongating in fruit, nodes (2 or)3–6, 3 flowers per node; bracts persistent or tardily deciduous, lanceolate to broadly elliptic, 7–12 × 4–5 mm, appressed-pubescent to canescent. |
Peduncles | 0.6–15 cm, longer than subtending petiole, strigose. |
2.7–8.2 cm, longer than subtending petiole, canescent. |
Pedicels | 2–3 mm. |
4–5 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. |
11–16 mm; calyx broadly campanulate in fruit, 8–12 mm abaxially, 7–9 mm adaxially, glandular, strigulose to canescent; tube 3–5 mm; lobes triangular or narrowly elliptic, abaxial 4.5–6 × 2.5 mm, adaxial 2–3.5 × 1.5–2 mm; corolla blue to blue-purple, sometimes fading yellowish green, banner oblanceolate, 11–15 × 6–8 mm with claw 3–5 mm, wings 10–13 × 2.5–3 mm with claw 4–5 mm, keel 7.5–9 × 2–2.5 mm with claw 4–5 mm; filaments 9–9.5 mm; anthers broadly elliptic, 0.5 mm; ovary glabrous or pubescent, style pubescent on proximal 1/2. |
Legumes | ovoid to obovate, 6–8 × 4–4.5 mm, glandular, pubescent distally, beak 1.5–2 mm, shorter than calyx. |
ellipsoid, 5–6 × 4–5 mm, densely glandular, pubescent, beak 4–6 mm, equal to or slightly shorter than calyx. |
Seed | reddish brown, reniform to globose, 3.5–4 × 4.5–5 mm. |
gray-green to red-brown, reniform, 4–5 × 3–4 mm. |
Pediomelum cuspidatum |
Pediomelum canescens |
|
Phenology | Flowering spring–summer. | Flowering summer. |
Habitat | Grasslands, meadows, woodlands. | Sandy soils, open woodlands, pine barrens. |
Elevation | 50–1500 m. (200–4900 ft.) | 0–200 m. (0–700 ft.) |
Distribution |
CO; KS; MT; NE; OK; SD; TX
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AL; FL; GA; NC; SC; VA
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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 canescens is found only in the Atlantic Coastal Plain in Florida and southern portions of Alabama and Georgia, with isolated populations known from the Carolinas and Sussex County, Virginia. It is well distinguished within the genus by the petioles being shorter than petiolules, particularly in middle and distal leaves. (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 canescens |
Name authority | (Pursh) Rydberg in N. L. Britton et al.: N. Amer. Fl. 24: 19. (1919) | (Michaux) Rydberg in N. L. Britton et al.: N. Amer. Fl. 24: 18. (1919) |
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