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Indian breadroot, large Indian breadroot, prairie turnip

skunktop

Habit Herbs usually caulescent, rarely subacaulescent to acaulescent, to 50 cm, eglandular and pubescent throughout. Herbs acaulescent or subacaulescent, 4–16 cm, mostly glandular (with obvious blond to dark brown glands) and pubescent throughout.
Stems

erect, usually unbranched, sometimes branched basally, leaves dispersed along stem and arising nearly perpendicular to it;

pseudoscapes 0.5–2 cm;

cataphylls 0.5–15 mm, striate.

erect, unbranched, retrorsely hairy, leaves clustered;

pseudoscapes mainly subterranean, to 4 cm;

cataphylls 0–5 mm, glabrous or pubescent.

Leaves

palmately (3–)5-foliolate;

stipules persistent, broadly lanceolate proximally to linear-lanceolate distally, 10–20 × 2–8 mm, stramineous basally, eglandular, glabrate to sparsely pubescent, hairs semi-erect;

petiole not jointed basally, (2–)30–100(–150) mm;

petiolules 1.5–4 mm;

leaflet blades elliptic to oblanceolate, 2–4(–6) × 0.7–2.3 cm, base attenuate to cuneate, apex broadly acute to rounded or retuse, surfaces abaxially pubescent, adaxially glabrate except on midvein.

palmately 5(or 6)-foliolate;

stipules usually persistent, sometimes tardily deciduous, lanceolate to elliptic, (4–)7–11 × 2.5–8 mm, glabrate to pubescent;

petiole jointed basally, (30–)50–120 mm, retrorse-hairy;

petiolules 2–3 mm;

leaflet blades abaxially gray-green, adaxially green to yellow-green, cuneate-obovate to orbiculate, (1.5–)2–4 × (0.8–)1.5–3.5 cm, base cuneate, apex broadly acute to rounded or retuse, surfaces glandular and pubescent.

Inflorescences

persistent (not disjointing at base of peduncle in fruit), elliptic to oblong;

rachis 1.6–7 cm, elongating slightly in fruit, nodes (6–)8–15, (2 or)3 flowers per node;

bracts persistent, oblanceolate to elliptic, 5–15 × (0.5–)4–9 mm, glabrate to sparsely pubescent, hairs semi-erect.

disjointing in age at peduncle base, globose to elongate, 1.5–5(–8) cm;

rachis 1.5–2.5 cm, nodes 4–6(–10), (2 or)3 flowers per node, internodes to 8 mm;

bracts tardily deciduous or persistent, ovate to elliptic, 5–12 × 3–7 mm, long-pubescent.

Peduncles

(0.5–)5–12(–15) cm, shorter than subtending petiole, pilose.

(2–)4–8(–10) cm, equal to or shorter than subtending petiole, pilose, hairs spreading or spreading-retrorse.

Pedicels

1–3 mm.

2–4(–6) mm.

Flowers

12–20 mm;

calyx strongly gibbous-campanulate in fruit, 13–16 mm abaxially, 12–14 mm adaxially, eglandular, pubescent;

tube 5–6 mm;

lobes linear or linear-lanceolate to elliptic, abaxial 7.5–10 × 2–2.5 mm, adaxial 4–7 × 1–1.5 mm;

corolla violet to blue-purple, banner sometimes paler, oblanceolate, 17–18 × 6 mm with claw 7–8 mm, wings 15–16.5 × 3–3.5 mm with claw 6–6.5 mm, keel 12–12.5 × 3 mm with claw 6–6.5 mm;

filaments 11–14 mm;

anthers elliptic, 0.5 mm;

ovary pubescent apically, style glabrous apically.

10–13 mm;

calyx gibbous-campanulate in fruit, 10–12.5 mm abaxially, 10–12 mm adaxially, glandular, pubescent;

tube 2.5–4 mm;

lobes linear or linear-lanceolate to elliptic, abaxial 7–9 × 2–3 mm, adaxial 4–8 × 1–1.5 mm;

corolla mostly purple, banner white to ochroleucous, elliptic to oblanceolate, 9–12 × 6 mm with claw 2–4 mm, wings 10–12 × 2–2.5 mm with claw 4–4.5 mm, keel 8–9 × 2–3 mm with claw 3.5–4.5 mm;

filaments 7–8.5 mm;

anthers elliptic, 0.3 mm;

ovary glabrous or pubescent apically, style glabrous or pubescent proximally.

Legumes

oblong, 4–6 × 2.5–3.5 mm, eglandular, pubescent, beak 9–13(–16) mm, exserted beyond calyx.

globose to ovoid, 5–7 × 3.5–5 mm, eglandular, pubescent on adaxial 1/2, beak 1–4 mm, not exserted beyond calyx.

Seed

brown, reniform, 4 × 3 mm, somewhat rugose.

red-brown to dark brown or gray-green and black-mottled, ellipsoid to reniform, 4–5 × 3 mm.

2n

= 22.

Pediomelum esculentum

Pediomelum mephiticum

Phenology Flowering late spring–summer. Flowering spring–summer.
Habitat Prairies, grasslands, open pine woodlands. Rocky or sandy soils, pine, juniper, or oak woodlands.
Elevation 500–2000 m. (1600–6600 ft.) 700–2000 m. (2300–6600 ft.)
Distribution
from FNA
AR; CO; IA; IL; KS; MN; MO; MT; ND; NE; NM; OK; SD; TX; WI; WY; AB; MB; SK
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NV; UT
[WildflowerSearch map]
[BONAP county map]
Discussion

Pediomelum esculentum was once one of the main sources of starch for Native American tribes of the Great Plains, eaten fresh, boiled, dried, or ground into flour and used as a thickening agent. Use of the root for food and barter was documented by Lewis and Clark on their historic expedition across the United States (Mer. Lewis and W. Clark 2003).

Pediomelum esculentum ranges in morphology from strongly caulescent to acaulescent with no apparent geographical structuring in this most widespread species. J. W. Grimes (1990) placed this species in subg. Pediomelum due to its persistent inflorescences. Molecular phylogenetic and network analyses suggest a split affinity for P. esculentum between both subgenera, suggesting that this may be an intermediate form and bridge between his subgenera or the groupings suggested by D. J. Ockendon (1965) based on habit—groupings somewhat supported by molecular phylogenies (A. N. Egan and K. A. Crandall 2008, 2008b).

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

The type locality of Pediomelum mephiticum is stated as Beaver City, Utah, which is largely agreed to be erroneous. The type locality is more likely Beaver Dam, Arizona (J. W. Grimes 1990). Pediomelum mephiticum is known from Mohave County in Arizona, Clark and Lincoln counties in Nevada, and Washington County in Utah.

(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. cuspidatum, P. cyphocalyx, P. digitatum, P. epipsilum, 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. castoreum, P. cuspidatum, P. cyphocalyx, P. digitatum, P. epipsilum, P. esculentum, P. humile, P. hypogaeum, P. latestipulatum, P. linearifolium, P. megalanthum, P. palmeri, P. pariense, P. pentaphyllum, P. piedmontanum, P. reverchonii, P. rhombifolium, P. subacaule, P. tenuiflorum, P. verdiense
Synonyms Psoralea esculenta Psoralea mephitica
Name authority (Pursh) Rydberg in N. L. Britton et al.: N. Amer. Fl. 24: 20. (1919) (S. Watson) Rydberg in N. L. Britton et al.: N. Amer. Fl. 24: 22. (1919)
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