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Nashville breadroot, white-rim scurfpea

Texas plains Indian breadroot

Habit Herbs acaulescent or subacaulescent, to 20 cm, eglandular except leaves or rarely stipules and bracts, pubescent. Herbs caulescent, 5–45 cm, mostly glandular throughout and pubescent.
Stems

absent, leaves clustered;

pseudoscapes erect, 3–10 cm, usually 1, sometimes to 6, rarely branched proximally;

cataphylls 10–20 mm (when present).

1, erect, usually unbranched, rarely branched, leaves dispersed along stem from middle;

pseudoscapes absent or to 8 cm;

cataphylls 5–12 mm, sometimes sparsely pubescent.

Leaves

palmately 5–7-foliolate;

stipules often fragmented on plant, partly connate, ovate, 11–24 × 11–16 mm, scarious, usually eglandular, sparsely pubescent;

petiole jointed basally, 40–150(–190) mm, shorter than peduncle, hirsute-villous;

petiolules 1–2.5 mm;

leaflet blades oblanceolate to elliptic, 1.5–4.5(–6) × 0.5–1.3(–1.8) cm, base cuneate, apex acuminate to obtuse, surfaces glandular, abaxially pubescent, adaxially sparsely so, usually along margins.

palmately 5–7-foliolate;

stipules persistent, narrowly lanceolate to suborbiculate, 8–15 × 2.5–7 mm, glandular, sparsely pubescent;

petiole not swollen or jointed basally, not canaliculate, 27–100 mm, strigose;

petiolules 1.5–2.5 mm;

leaflet blades oblanceolate to elliptic, 2–4.4 × 0.5–1.4 cm, base cuneate, apex acute to obtuse, surfaces glandular, abaxially pubescent, especially along veins and margins, adaxially glabrous.

Inflorescences

disjointing in age at peduncle base, long-ovoid;

rachis 2.5–9.5 cm, elongating through fruiting, nodes 4–11(–15), 3 flowers per node, internodes 1–5 mm, elongating to 25 mm in fruit;

bracts persistent, orbiculate to lanceolate, 7–14 × 2–7 mm, margins pubescent, apex sometimes caudate or emarginate, becoming papery and veined in age.

persistent, ovoid to ellipsoid;

rachis 0.6–4.2 cm, nodes 4–12, 2 or 3 flowers per node, internodes to 7 mm;

bracts persistent, elliptic to spatulate, or ovate, or oblanceolate to orbiculate, 6–11 × 2–8 mm, glandular, glabrous or sparsely pubescent.

Peduncles

4–14 cm (8–19 cm in fruit), longer than subtending petiole, setose.

1.3–4.8 cm, shorter than or slightly longer than subtending petiole, pubescent.

Pedicels

1–2 mm.

2–3 mm.

Flowers

10–15(–22) mm;

calyx weakly gibbous-campanulate in fruit, 6–10 mm abaxially, 5–8 mm adaxially, glabrate and eglandular on gibbous portion, sparsely setose and glandular distally;

tube stramineous, 4.5–6 mm;

lobes triangular, abaxial 2–4 × 2 mm, adaxial 1–2 × 1 mm;

corolla dark blue to purple, banner oblanceolate to oval, 13–23 × 4–5 mm with claw 5–6 mm, wings 12–18 × 2–3 mm with claw 5–7 mm, keel 10–15 × 2–3 mm with claw 2–3 mm;

filaments 10–12 mm;

anthers obovate, 0.3 mm;

ovary pubescent apically, style pubescent basally.

18–26 mm;

calyx strongly gibbous-campanulate in fruit, 12–19 mm abaxially, 10–15 mm adaxially, glandular and sparsely pubescent distally;

tube 6–8 mm;

lobes linear-lanceolate, abaxial 4.5–7.5 × 1.5–2 mm, adaxial 3–6 × 1–1.5 mm;

corolla blue to purple, banner broadly oblanceolate to obovate, 16–25 × 6–9 mm with claw 7–10 mm, wings 15–20 × 2.5–4 mm with claw 6–9 mm, keel 12–16 × 3–3.5 mm with claw 6–9 mm;

filaments 11–16 mm;

anthers elliptic, 0.7–0.8 mm;

ovary glabrous, style glabrous.

Legumes

globose to ovoid, 6–7 × 4–5 mm, eglandular, sparsely pubescent apically, beak triangular, 4–6 mm, exserted beyond calyx.

ovoid, 5–6.5 × 4–4.5 mm, glandular, glabrous, beak 5.5–6 mm, slightly shorter to slightly longer than calyx.

Seed

gray-brown to red-brown, obovoid-reniform, 5–6 × 3–4 mm.

dark green to olive green, reniform, 4 × 5 mm.

2n

= 22.

Pediomelum subacaule

Pediomelum latestipulatum

Phenology Flowering spring.
Habitat Calcareous soils, cedar glades.
Elevation 200–1500 m. (700–4900 ft.)
Distribution
from FNA
AL; GA; TN
[WildflowerSearch map]
[BONAP county map]
from USDA
Texas
[BONAP county map]
Discussion

Pediomelum subacaule is known from Colbert and Franklin counties in Alabama, Catoosa County in Georgia, and Davidson, Maury, Rutherford, and Wilson counties in Tennessee.

Pediomelum subacaule is quite distinct and disjunct from its fellow members of subg. Disarticulatum, this evidenced by its large, partly connate stipules and short, broad calyx lobes, and by being the only species in the subgenus east of the Mississippi River. Pediomelum subacaule is restricted to limestone soil in open cedar glades. Although P. subacaule is well established in the protected cedar glades of Tennessee, its historical range is shrinking due to habitat loss. Several historical sites that were, or still are, active limestone quarries have no remaining evidence of P. subacaule, particularly in Alabama and Georgia.

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

Varieties 2 (2 in the flora).

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

Key
1. Stems with erect to spreading hairs.
var. latestipulatum
1. Stems with appressed hairs.
var. appressum
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. 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. 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. linearifolium, P. megalanthum, P. mephiticum, P. palmeri, P. pariense, P. pentaphyllum, P. piedmontanum, P. reverchonii, P. rhombifolium, P. subacaule, P. tenuiflorum, P. verdiense
Subordinate taxa
P. latestipulatum var. appressum, P. latestipulatum var. latestipulatum
Synonyms Psoralea subacaulis, Lotodes subacaulis Psoralea latestipulata
Name authority (Torrey & A. Gray) Rydberg in N. L. Britton et al.: N. Amer. Fl. 24: 20. (1919) (Shinners) Mahler: Sida 12: 250. (1987)
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