Flora of North America species comparison

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Orbexilum simplex

singlestem leather-root
Habit Herbs to 7.5 dm; with fusiform taproot.
Stems

appressed-pubescent, glabrescent.
Leaves

usually pinnately 3-foliolate, sometimes unifoliolate or palmately 5–7-foliolate;

stipules long-triangular to linear, 4–6 mm;

petiole usually 5–70 mm;

leaflet blades elliptic to elliptic-lanceolate, 40–80 × 6–15 mm, surfaces ± glandular-punctate, sparsely pubescent.
Inflorescences

columnar, 2–6 cm.
Peduncles

3–10 cm.
Flowers

8–10 mm;

calyx 5–7 mm, glandular-punctate, sparsely pubescent;

corolla purple, banner oblanceolate.
Legumes

4–6 × 3–5 mm, glandular-punctate, rugose.
Seeds

depressed-obovate, 3–4 mm.

Orbexilum simplex
Phenology Flowering May–Jun.
Habitat Sandy soils, marshy areas.
Elevation 0–400 m. (0–1300 ft.)
Distribution
from FNA
AL; AR; LA; MS; OK; TX
[BONAP county map]
Discussion

A collection by Buckley labeled as from Carlyle, Illinois, at GH may be mislabeled; Orbexilum simplex is not known to occur so far north (J. W. Grimes 1990).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Orbexilum
Sibling taxa
O. lupinellus, O. macrophyllum, O. onobrychis, O. pedunculatum, O. psoralioides, O. stipulatum, O. virgatum
Synonyms Psoralea simplex, Lotodes simplex, P. palustris
Name authority (Nuttall ex Torrey & A. Gray) Rydberg in N. L. Britton et al.: N. Amer. Fl. 24: 6. (1919)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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