[Panicum lagascae var. quadrifarium (Lam.) Kuntze, morePaspalum ferrugineum Trin., Paspalum quadrifarium var. ferrugineum (Trin.) Herter, Paspalum quadrifarium var. majus Döll, Paspalum quadrifarium var. minus Döll]
Plants perennial; cespitose. Culms (50)100-180 cm, erect; nodes
pubescent. Sheaths pubescent, margins extending into auricles; ligules
1-6.3 mm; blades 15-62 cm long, 4.9-6.1 mm wide, involute to flat, glabrous.
Panicles terminal, with 15-44 racemosely arranged branches; branches
1.2-8.5 cm, straight, erect to ascending, lower branches longer than those above;
branch axes 0.5-0.6 mm wide, narrowly winged, glabrous, margins scabrous,
pubescent, terminating in a spikelet. Spikelets 2-2.5(3) mm long, 0.9-1.3
mm wide, paired, divergent to spreading from the branch axes, elliptic, brown
to stramineous, often purple-tinged. Lower glumes usually absent, if present,
to 0.9 mm, triangular; upper glumes shortly pubescent, 3-veined, purple-spotted,
margins entire; lower lemmas glabrous or pubescent, lacking ribs over the
veins, 3-veined, margins entire; upper florets 2.2-2.5 mm, white. 2n
= 20, 30, 40.
Paspalum quadrifarium is native to Uruguay, Paraguay, Brazil, and Argentina.
It is grown as an ornamental in Florida, but has also become established in disturbed
habitats of the southeastern United States. It is considered a noxious weed in
New South Wales, Australia.