Hoffmannseggia glauca
Hoffmannseggia oxycarpa
hoffmanseggia, hog potato, Indian rushpea, pig-nut
sharppod rushpea
38–150 ×13–42 mm;
stipules ovate, 1.5–4 × 1.5–3 mm, ciliate;
pinnae 4–13;
leaflets 7–27 per pinna, blades obtuse-ovate, 2–6 × 1–4.5 mm, surfaces strigose abaxially, glabrous adaxially.
4–15-flowered, terminal, 5–23 cm;
rachis and pedicels puberulent to strigose and stipitate-glandular.
turning downward, broadly flared, 10–16 × 10–18 mm;
calyx persistent, densely pubescent abaxially, with multicellular, glandular trichomes;
banner yellow, drying pink with red markings, 5–14 × 5 mm, conspicuous multicellular, glandular trichomes on claw and abaxial surface, with few hairs at base of folded claw adaxially;
lateral petals bright yellow, 13 × 6 mm, with multicellular, glandular trichomes on claw margins and base abaxially.
tan, rectangular to arcuate, sometimes expanded near apex, 20–40 × 5–8 mm, indehiscent, margins ± parallel, obscure, apex obtuse to acute;
valves flat, sparsely tomentose, with a few scattered multicellular, glandular trichomes appearing as brown dots.
1–10.
= 24.
Hoffmannseggia glauca
Hoffmannseggia oxycarpa
Hoffmannseggia glauca is considered a noxious weed in agricultural and pasture lands of the middle and southwestern United States, spreading aggressively by tuberous roots. While it is possible that it was introduced into North America by humans, historical use of the tubers by indigenous people in the American Southwest indicates a long association and, perhaps, natural long-distance dispersal from South America.
Hoffmannseggia falcaria Cavanilles, an illegitimate and superfluous name, pertains here.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Subspecies 2 (1 in the flora).
Subspecies arida (Rose) B. B. Simpson occurs in Hidalgo and Querétaro, Mexico, and differs from subsp. oxycarpa by being more robust and by legumes having black-tipped, multicellular trichomes.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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