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Indian breadroot, large Indian breadroot, prairie turnip

California Indian breadroot, Indian breadroot

Habit Herbs usually caulescent, rarely subacaulescent to acaulescent, to 50 cm, eglandular and pubescent throughout. Herbs subacaulescent to shortly caulescent, to 26 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.

short-erect, branched sparsely proximally and often with decumbent lateral branches, to 26 cm at maturity, these with terminal cluster of leaves and inflorescences, very rarely branched again, leaves dispersed along short main stem or appearing clustered at base;

pseudoscapes to 4 cm;

cataphylls 0.5–7 mm, glabrous.

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 5–7-foliolate;

stipules tardily deciduous or persistent, lanceolate to slightly falcate, 7–10 × 2.5–3 mm, stramineous, appressed-spreading pubescent;

petiole slightly enlarged and jointed basally, (20–)40–100(–110) mm, sparsely glandular abaxially, appressed-spreading pubescent;

petiolules 1.5–2.5 mm;

leaflet blades obovate to slightly rhombic, 1.3–3 × 1–1.7 cm, base attenuate, apex broadly acute to rounded or retuse, surfaces glandular and appressed-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 slightly elongate;

rachis 0.7–2.5 cm, fairly crowded, nodes (2–)4–10, (1 or)2 or 3 flowers per node, internodes to 9 mm;

bracts tardily deciduous or persistent, oblanceolate to elliptic, 6.5–8 × 2–4 mm, appressed-spreading pubescent.

Peduncles

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

(1.5–)2.5–6.5 cm, shorter than subtending petiole, appressed-spreading pubescent.

Pedicels

1–3 mm.

3–5(–7) 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.

8–12 mm;

calyx gibbous-campanulate in fruit, 9.5–10.5 mm abaxially, 8.5–10 mm adaxially, glandular, white-villous;

tube 2–3 mm;

abaxial lobe elliptic to oblanceolate, 6.5–8.5 × 1.5–2 mm, adaxial lobe linear to linear-lanceolate, 6.5–7.5 × 1–1.5 mm;

corolla blue to violet, banner usually white or lighter than other petals, oblanceolate, 10–11 × 6 mm with claw 2.5–3 mm, wings 9.5–10.5 × 2–2.5 mm with claw 2.5–3.5 mm, keel 7–8 × 2–3 mm with claw 3–4 mm;

filaments 6.5–7 mm;

anthers elliptic, 0.3 mm;

ovary pubescent apically, style pubescent basally.

Legumes

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

ellipsoid to ovoid, 4–9 × 3.5–5 mm, eglandular, short-pubescent, beak linear, 1–4 mm, not exserted beyond calyx.

Seed

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

red-brown to brown, black-mottled, narrowly reniform, 5–5.5 × 3–3.5 mm.

2n

= 22.

= 22.

Pediomelum esculentum

Pediomelum californicum

Phenology Flowering late spring–summer. Flowering late spring–summer.
Habitat Prairies, grasslands, open pine woodlands. Rocky soils, chaparral, pine, juniper, or oak woodland openings.
Elevation 500–2000 m. (1600–6600 ft.) 500–2500 m. (1600–8200 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
CA; Mexico (Baja California)
[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.)

Pediomelum californicum is morphologically similar to P. mephiticum, and some have chosen to combine them into a single species (A. M. Vail 1894), suggesting that P. californicum is simply a disjunct P. mephiticum. Others have relied on the distinct geographic separation and difference in caulescent versus acaulescent habit as distinguishing characters (J. W. Grimes 1990; S. L. Welsh et al. 1993).

Pediomelum californicum is found from Tehama County southward to San Diego County and northern Mexico.

(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. canescens, P. castoreum, 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 esculenta Psoralea californica, P. monticola
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: 21. (1919)
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