Pediomelum esculentum |
Pediomelum megalanthum |
|
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Indian breadroot, large Indian breadroot, prairie turnip |
breadroot, intermountain Indian breadroot, large-flower Indian breadroot |
|
Habit | Herbs usually caulescent, rarely subacaulescent to acaulescent, to 50 cm, eglandular and pubescent throughout. | Herbs mostly acaulescent, 4–25 cm, glandular (with obvious blond to dark brown glands) and pubescent. |
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 to decumbent, short and hidden by stipules, sometimes with decumbent lateral stems with dense cluster of leaves and inflorescences distally, unbranched, leaves clustered; pseudoscapes to 0.5 cm; cataphylls to 15 mm, conspicuously veined. |
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(–8)-foliolate; stipules persistent, lanceolate to elliptic, 5–14 × 2.5–5 mm, pubescent; petiole jointed to leaf spur, 4–13(–15) mm, glabrate to sparsely pubescent; petiolule 0.5–2 mm; leaflet blades broadly ovate, orbiculate, oblanceolate, or ± rhombic, 1–4 × 0.6–4 cm, base cuneate or attenuate, apex rounded to broadly acute, surfaces gray-green to yellow-green, sometimes bicolor, glandular, 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, subglobose to elongate; rachis 0.5–7 cm, elongating in fruit, nodes 2–10, (1–)3(or 4) flowers per node, internodes relatively short or to 9 mm; bracts tardily deciduous, oblanceolate, lanceolate, or elliptic, (6–)8–13(–18) × 2.5–10 mm, eglandular to sparsely glandular, strigose abaxially. |
Peduncles | (0.5–)5–12(–15) cm, shorter than subtending petiole, pilose. |
2.5–7.5(–10) cm, shorter than subtending petiole, pubescent, with relatively long, erect to reflexed hairs or with hairs of 2 types: short, appressed to incurved-ascending hairs and long, spreading-erect to reflexed, straight to curly hairs. |
Pedicels | 1–3 mm. |
1.5–6(–8) 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. |
(13–)15–20(–22) mm; calyx gibbous-campanulate in fruit, (14–)16–19 mm abaxially, (13–)15–17 mm adaxially, eglandular or minutely glandular, setose or with appressed hairs; tube 6–8(–10) mm; lobes lanceolate to oblanceolate or elliptic, abaxial 7–10 × 2.5–3 mm, adaxial 6–8 × 1–2 mm; corolla whitish blue to purple, banner lighter than or similar to wings and keel, obovate-lanceolate, 16–22 × 6–9 mm with claw 6–7 mm, wings 13–20 × 2–3 mm with claw 8–10 mm, keel 14–16 × 2–3 mm with claw 8–9 mm, blade with darker blotch distal to middle; filaments 13–17 mm; anthers elliptic, 0.3 mm; ovary pubescent throughout or on distal 1/2, style pubescent at base. |
Legumes | oblong, 4–6 × 2.5–3.5 mm, eglandular, pubescent, beak 9–13(–16) mm, exserted beyond calyx. |
oval-ellipsoid, 6–9 × 4–5 mm, eglandular, erect- to appressed-pubescent distally, beak attenuate, (3–)5–8 mm, included within calyx. |
Seed | brown, reniform, 4 × 3 mm, somewhat rugose. |
brown, reniform-elliptic, 4–5 × 3–4 mm, shiny. |
2n | = 22. |
|
Pediomelum esculentum |
Pediomelum megalanthum |
|
Phenology | Flowering late spring–summer. | Flowering spring–late summer. |
Habitat | Prairies, grasslands, open pine woodlands. | Decaying sandstone and clay soils on rock outcrops, desert shrub and pinyon-juniper communities. |
Elevation | 500–2000 m. (1600–6600 ft.) | 500–2000 m. (1600–6600 ft.) |
Distribution |
AR; CO; IA; IL; KS; MN; MO; MT; ND; NE; NM; OK; SD; TX; WI; WY; AB; MB; SK
|
AZ; CO; NM; NV; UT
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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 megalanthum and its varieties have variably been recognized at specific or varietal levels. J. W. Grimes (1990) and D. Isely (1998) included P. epipsilum as a variety under P. megalanthum along with var. retrorsum and var. megalanthum, while others have recognized these at the specific level (S. L. Welsh et al. 1993), based largely on the directionality and type of peduncle vestiture. A recent morphometric analysis showed no clear break between vars. megalanthum and retrorsum (A. N. Egan 2015). Intrapopulational variation in peduncle vestiture and hair type has also been observed (Max Licher and John Anderson, pers. comm.). Therefore, these are here recognized as a single species. (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 esculenta | Psoralea megalantha, P. megalanthum var. retrorsum, P. retrorsum, Psoralea mephitica var. retrorsa, P. retrorsa |
Name authority | (Pursh) Rydberg in N. L. Britton et al.: N. Amer. Fl. 24: 20. (1919) | (Wooton & Standley) Rydberg in N. L. Britton et al.: N. Amer. Fl. 24: 22. (1919) |
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