Pediomelum digitatum |
Pediomelum aromaticum |
|
---|---|---|
palmleaf Indian breadroot |
aromatic Indian breadroot |
|
Habit | Herbs caulescent, 30–90 cm, sparsely glandular on adaxial leaf surfaces, mostly eglandular elsewhere, appressed-canescent. | Herbs caulescent, to 25 cm, mostly glandular and strigose throughout; spreading by rhizomes, often forming patches. |
Stems | erect, several branched distally, leaves dispersed along stems; pseudoscapes to 6 cm (when present); cataphylls 7–14 mm, glabrous or pubescent, at least abaxially. |
suberect to decumbent, branched, leaves dispersed along stems; pseudoscapes 0–12 cm; cataphylls 0–7 mm, prominently veined. |
Leaves | palmately (3–)5(–7)-foliolate; stipules persistent, linear becoming arcuate-recurved, 4–11 × 2–3 mm, eglandular or sparsely glandular, sparsely pubescent; petiole sometimes swollen but not jointed basally, slightly canaliculate, 10–35 mm; petiolules 1.5–3 mm; leaflet blades linear-lanceolate to oblanceolate, 0.9–5.5 × 0.2–0.8 cm, base cuneate, apex acuminate to apiculate, surfaces abaxially eglandular and appressed-pubescent, adaxially glandular and glabrate, or at least pubescent, along midvein. |
palmately (3–)5–7-foliolate; stipules persistent, triangular, 2–8(–9) × 1–5 mm, glandular and strigose abaxially; petiole jointed to stem, 12–80 mm, strigose; petiolules 1–3 mm; leaflet blades oblanceolate, ovate, or rhombic, (0.6–)1.2–2.6 × (0.3–)1–2 cm, base cuneate, apex rounded to retuse, usually apiculate, surfaces glandular, abaxially uniformly strigose, adaxially strigose to glabrate or with hairs concentrated along veins. |
Inflorescences | persistent, elongate, lax; rachis 2–6.5 cm, nodes (1 or)2–8, 3 flowers per node, internodes to 32 mm; bracts persistent, spatulate, obovate, or orbiculate, 2–10 × 1–5 mm, appressed-pubescent abaxially, glabrous adaxially. |
persistent, umbellate or subcapitate, rarely reduced to a single flower; rachis 0–0.8 cm, nodes 1–7, 3 flowers per node, internodes 1–2(–4) mm; bracts tardily deciduous or persistent, lanceolate to narrowly elliptic, sometimes short-cupulate, 2–7 × 1–3 mm, glandular and strigose abaxially. |
Peduncles | 6.5–22 cm, much longer than subtending petiole, strigose. |
0.2–1.3 cm, shorter than subtending petiole, strigose. |
Pedicels | 1–3 mm. |
1–2.5(–4) mm. |
Flowers | 9.5–10.5 mm; calyx broadly and shallowly campanulate in fruit but not gibbous, 6–8 mm abaxially, 5–6 mm adaxially, eglandular to sparsely glandular, with light blond glands, appressed-pubescent, sometimes sparsely so; tube 2–3 mm; lobes deltate to lanceolate, abaxial 4–5 × 1–1.5 mm, adaxial 1.5 × 1 mm; corolla purple, violet, or blue-lavender, banner oblanceolate, 9.5–10 × 5–6 mm with claw 2–3 mm, wings 9–10 × 3 mm with claw 3–4 mm, keel 6.5–7 × 2–3 mm with claw 3 mm; filaments 6–6.5 mm; anthers ovoid, 0.4 mm; ovary glabrous, pubescent apically, style pubescent basally. |
(7–)8–11(–12) mm; calyx gibbous-campanulate in fruit, 5.5–10 mm abaxially, 4.5–8 mm adaxially, glandular, pubescent; tube 3–4 mm; abaxial lobe elliptic to oblanceolate, 2.5–7 × 1.5–2 mm, adaxial lobes triangular, 2–4(–5) × 1 mm; corolla blue-purple, banner white or paler than other petals, oblanceolate, 9–11 × 4–5.5 mm with claw 2.5–3 mm, wings 9–11 × 2–3 mm with claw 3.5–4 mm, keel 7–8 × 2 mm with claw 3–4 mm; filaments 6–6.5 mm; anthers ovate, 0.3 mm; ovary glabrous, style pubescent basally. |
Legumes | obovoid to globose, 5–6 × 3.5–4 mm, glandular, sparsely strigose, at least distally, beak triangular, 1.5–4 mm, shorter than calyx lobes. |
globose to ovoid, 5–6 × 4 mm, glandular and short-strigose distally, beak broad, slightly arcuate, 5–6 mm, exserted beyond calyx. |
Seed | gray-green to red-brown, globose-reniform, 5 × 3–4 mm. |
gray-green to red-brown, oblong-reniform, 4.5–5 × 3.5–4 mm, shiny. |
Pediomelum digitatum |
Pediomelum aromaticum |
|
Phenology | Flowering summer. | Flowering spring–summer. |
Habitat | Grasslands, shrub communities. | Rocky clay or sandstone soils, barren or open places in pinyon-juniper woodlands. |
Elevation | 50–1500 m. (200–4900 ft.) | 1000–2000 m. (3300–6600 ft.) |
Distribution |
AR; CO; KS; LA; NE; NM; OK; SD; TX; WY
|
AZ; CO; UT |
Discussion | Pediomelum digitatum is similar to P. linearifolium in habit, size, and distribution but differs in having more leaflets and pedicels 1–3 mm; pedicels in P. linearifolium can be 3–4 times as long. Furthermore, P. digitatum is eglandular or very sparsely glandular abaxially on leaflet blades whereas P. linearifolium is profusely glandular on both leaflet blade surfaces. Variety parvifolium refers to plants in Texas with narrow leaflets; J. W. Grimes (1990) and D. Isely (1998) stated that variation in leaflet size is found throughout the range, and thus var. parvifolium is not recognized herein as distinct. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Pediomelum aromaticum is known from Mohave County in Arizona, Montrose County in Colorado, and southern Utah. In the past, varieties were recognized based on the number of flowers per node, flower and peduncle length, and stem robustness. These varieties are largely confined to distinct geographical populations or areas. Variety ambiguum was described from Little Valley in Grand County as having long peduncles (5–28 mm) and an often bidentate abaxial calyx tooth. Variety barnebyi was described from populations from the Canaan Mountain region in Washington county and adjacent Arizona, an area at the westernmost edge of the P. aromaticum distribution. These plants are more robust than others, have more flowers per inflorescence, and have longer peduncles, but plants from across the range show similar robustness with number of flowers per inflorescence varying widely. Variety tuhyi was described as differing from var. aromaticum in having flowers smaller than 9 mm, coupled with decumbent stems. J. W. Grimes (1990) pointed out that mature flowers on several collections, including the holotype, are longer than 9 mm, and not all plants are decumbent. (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 digitata, P. digitatum var. parvifolium, Psoralea digitata var. parvifolia, Psoralidium digitatum | Psoralea aromatica, P. aromaticum var. ambiguum, P. aromaticum var. barnebyi, P. aromaticum var. tuhyi |
Name authority | (Nuttall ex Torrey & A. Gray) Isely: Sida 11: 430. (1986) | (Payson) W. A. Weber: Phytologia 53: 188. (1983) |
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