Desmodium triflorum
Prodr. 2: 334. 1825.
Herbs, annual or perennial, often mat-forming; stoloniferous. Stems prostrate, densely branched, 20–80 cm, ascending-pilose or strigose. Leaves trifoliolate; stipules persistent, narrowly ovate, 3–5 mm; petiole 3–7.5 mm; leaflet blades broadly obovate or cuneate-obovate, often folding downwards, apex emarginate, surfaces usually sparsely uncinate-puberulent or subappressed-pilose along midrib abaxially, rarely entire surface, glabrous adaxially; terminal blade 5–10 × 3–11 mm, length 0.8–1.2 times width. Inflorescences terminal fascicles opposite distal leaf, appearing axillary, unbranched; rachis pubescent; primary bracts narrowly ovate, 4 mm. Pedicels 8–12 mm. Flowers: calyx 2.5–3 mm, appressed-pubescent, tube 1.2 mm; abaxial lobes 1.5–1.7 mm, lateral lobes 1.5–1.7 mm, adaxial lobes deeply 2-toothed; corolla pale pink to purplish, 4–5 mm, keel distinctly longer than wings. Loments: sutures weakly crenate abaxially, with broad connection between segments, barely sinuate adaxially; connections 2/3–4/5 as broad as segments; segments 3–5, nearly square, 2.5–3.5 × 2.5–3 mm, symmetrically convex abaxially, slightly concave adaxially, inconspicuously uncinate-pubescent or glabrescent; stipe 0 mm. 2n = 22.
Phenology: Flowering year-round.
Habitat: Ruderal areas, lawns, disturbed open woodlands.
Elevation: 0–50 m.
Distribution
Introduced; Fla., La., Mexico (Jalisco, Sinaloa), West Indies, Central America, South America, Asia, Africa, introduced also in Indian Ocean Islands, Pacific Islands, Australia.
Discussion
Inflorescences of Desmodium triflorum are produced opposite the leaf at the distal end of stem and are usually described as axillary. The branching system of D. triflorum is a monopodial sympodium and the inflorescences are terminal (H. Ohashi and T. Nemoto 1986). Evolution of inflorescences in Desmodium is inferred from comparative morphology and anatomy with Campylotropis, Kummerowia, and Lespedeza (Nemoto and Ohashi 1990, 1993, 1996).
Based on molecular and morphological data, H. Ohashi and K. Ohashi (2018) transferred Desmodium triflorum and the other species formerly in Desmodium sects. Nicolsonia (de Candolle) Bentham and Sagotia (Duchassaing & Walpers) Bentham to the genus Grona Loureiro.
Selected References
None.