Flora of North America species comparison

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Desmodium gramineum

grassleaf ticktrefoil
Habit Herbs, perennial.
Stems

stiffly erect or ascending, branched at base and appearing clustered, 40–80 cm, glabrescent or sparsely uncinate-puberulent.
Leaves

unifoliolate;

stipules caducous, narrowly ovate, 3–9 mm;

petiole 10–30 mm;

leaflet blades linear, (40–)70–130 × 2–5 mm, length 10+ times width, apex acute or acuminate, surfaces uncinate-puberulent and sparsely strigose on veins abaxially, uncinate-puberulent adaxially.
Inflorescences

branched or unbranched;

rachis sparsely uncinate-puberulent;

primary bracts ovate, 2–3 mm.
Pedicels

10–20 mm, uncinate-puberulent or glabrescent.
Flowers

calyx 2 mm, puberulent and uncinate-puberulent, tube 0.8 mm;

abaxial lobes 1.2 mm, lateral lobes 1 mm;

corolla ephemeral, purple, 3 mm.
Loments

margins slightly involute, sutures equally crenate;

connections central, 1/4 as broad as segments;

segments 3–6, broadly elliptic, (2–)3–3.5 × 2.5–3 mm, convex or rounded abaxially and adaxially, sparsely uncinate-puberulent, sutures moderately uncinate-puberulent;

stipe to 1 mm.

Desmodium gramineum
Phenology Flowering late summer–fall.
Habitat Dry woodlands, grass­lands, open hillsides.
Elevation 1100–1500 m. (3600–4900 ft.)
Distribution
from FNA
AZ; Mexico (Chihuahua, Colima, Jalisco, Michoacán, Oaxaca, Sinaloa, Sonora, Tamaulipas)
[BONAP county map]
Discussion

In Arizona, Desmodium gramineum is known from Cochise, Pima, Pinal, and Santa Cruz counties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Desmodium
Sibling taxa
D. arizonicum, D. batocaulon, D. canadense, D. canescens, D. cinerascens, D. cuspidatum, D. floridanum, D. grahamii, D. illinoense, D. incanum, D. intortum, D. laevigatum, D. lindheimeri, D. lineatum, D. marilandicum, D. metcalfei, D. nuttallii, D. ochroleucum, D. paniculatum, D. procumbens, D. psilocarpum, D. psilophyllum, D. retinens, D. rosei, D. rotundifolium, D. scopulorum, D. scorpiurus, D. sessilifolium, D. strictum, D. tenuifolium, D. tortuosum, D. triflorum, D. tweedyi, D. viridiflorum, D. ×humifusum
Synonyms D. angustifolium var. gramineum, Meibomia graminea
Name authority A. Gray: Smithsonian Contr. Knowl. 5(6): 46. (1853)
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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