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Indian breadroot, large Indian breadroot, prairie turnip

verde breadroot, verde formation breadroot

Habit Herbs usually caulescent, rarely subacaulescent to acaulescent, to 50 cm, eglandular and pubescent throughout. Herbs acaulescent to short-caulescent, 4.5–13(–15) 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, rarely with decumbent laterals, unbranched or with few branches near base, spreading white hairy, leaves appearing clustered or dispersed along short stems;

pseudoscapes to 6 cm (when present);

cataphylls 0–15 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 (3–)5(or 6)-foliolate;

stipules tardily deciduous or persistent, lanceolate to elliptic, 4–16 × 2–8 mm, scarious, strigose to glabrate;

petiole jointed basally, 10–100(–115) mm, hairs appressed-ascending;

petiolules 1.5–3 mm;

leaflet blades abaxially gray-green, adaxially green to yellow-green, cuneate-obovate, (0.8–)1.2–3 × 0.7–1.8(–2.2) cm, base cuneate, apex broadly acute to rounded or retuse, surfaces glandular and pubescent, with more hairs abaxially and also along veins adaxially.

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, cymose;

rachis 1–3 cm, nodes (1 or)2–4(–6), (2 or)3 flowers per node;

bracts tardily deciduous or persistent, elliptic, 3.5–8.5(–10) × 2–6 mm, strigose.

Peduncles

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

(0.5–)1–5.5(–6) cm, shorter than subtending petiole, pilose, spreading or spreading-ascending white-hairy, sometimes with longer spreading hairs.

Pedicels

1–3 mm.

2.5–4.5(–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.

(8–)10–13.5(–15) mm;

calyx gibbous-campanulate in fruit, (7–)9–11.5 mm abaxially, (7–)9–11 mm adaxially, glandular, with blond glands obscured by indument, pubescent;

tube (3.5–)4–5 mm;

lobes lanceolate to oblong or elliptic, abaxial (4–)5–9 × (1.5–)2–3.5 mm, adaxial 4–7(–8) × 1–2.5 mm;

corolla white to purple, banner white, cream, purple, or suffused with pale purple, wings and keel dark purple, wings sometimes lighter, banner broadly elliptic to ± oblanceolate, (7–)9–12(–14) × 6–8 mm with claw 2–5 mm, wings 10–13 × 2–3 mm with claw 4–5 mm, keel 8–10 × 2–3.5 mm with claw 3–5 mm;

filaments 7–8.5 mm;

anthers elliptic, 0.3 mm;

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

Legumes

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

round to ovoid, 5–7 × 3.5–5 mm, eglandular, pubescent, beak 1–4 mm, not exserted beyond calyx.

Seed

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

olive to gray-brown, with or without purple mottling, oval to reniform, 3.5–5 × 2.5–3 mm, shiny.

2n

= 22.

Pediomelum esculentum

Pediomelum verdiense

Phenology Flowering late spring–summer. Flowering spring–summer.
Habitat Prairies, grasslands, open pine woodlands. Limestone soils, desert scrub and pinyon-juniper communities.
Elevation 500–2000 m. (1600–6600 ft.) 1000–1700 m. (3300–5600 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
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 verdiense and P. pauperitense were described as separate taxa by S. L. Welsh and M. H. Licher (2010), with P. verdiense endemic to the silty, white limestone soil of the Verde Formation, Yavapai County, and P. pauperitense endemic to the pink limestone soil of Poverty Mountain, Mohave County. Pediomelum pauperitense was described as having smaller flowers, pedicels, bracts, and seeds. Morphometric analysis showed extensive overlap in all quantitative characters between P. pauperitense and P. verdiense (A. N. Egan 2015). Beyond range and substrate differences, P. pauperitense is said to differ from P. verdiense by having banner and wings suffused with purple, more upright leaves with leaflets held above the inflorescences, and less silvery vestiture—traits that some would argue merit recognition of P. pauperitense at least at varietal status. Both peduncle and petiole length overlap between the taxa, and live specimens of both taxa exhibit inflorescences held below the leaves, and vestiture density varies greatly, even within a population. Banner color may be a character difference, but further research into soil substrate specificity and impacts of soil pH on flower color is needed. Pediomelum pauperitense may represent a hybrid between P. mephiticum and P. verdiense, as several characters overlap or are intermediate between the two. Molecular phylogenetic work would help to clarify the relationships of P. verdiense with morphologically similar congeners, including P. californicum and P. mephiticum.

(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. mephiticum, P. palmeri, P. pariense, P. pentaphyllum, P. piedmontanum, P. reverchonii, P. rhombifolium, P. subacaule, P. tenuiflorum
Synonyms Psoralea esculenta P. pauperitense
Name authority (Pursh) Rydberg in N. L. Britton et al.: N. Amer. Fl. 24: 20. (1919) S. L. Welsh: Licher & N. D. Atwood, W. N. Amer. Naturalist 70: 12, fig. 3. (2010) — (as verdiensis)
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