Brachiaria reptans (L.) C.A.Gardner & C.E.Hubb.
Brachiaria (Trin.) Griseb., in C.F. von Ledebour, Fl. Ross. 4: 469 (1853). From the Latin brachium (arm), alluding to the manner of bearing the racemes.
reptans- from the Latin repo (crawl). Culms ascending from a creeping rhizome of runner.
Hooker's Icon. Pl. t. 3363: 3 (1938).
Urochloa reptans (L.) R.D.Webster
Annual. Stolons present. Culms decumbent, 1060 cm tall, rooting from lower nodes. Mid-culm internodes glabrous. Mid-culm nodes pubescent. Ligule a fringe of hairs. Leaf-blade base broadly rounded. Leaf-blades lanceolate, 1.58 cm long, 315 mm wide. Leaf-blade surface glabrous or hairy. Leaf-blade margins scabrous.
Inflorescence compound, a panicle of racemes. Racemes 515, unilateral, 14 cm long, 0.10.5 mm wide. Central inflorescence axis 18 cm long. Rhachis wingless, angular, smooth on surface or scabrous on surface. Spikelet packing imbricate, irregular or regular, 2-rowed.
Spikelets in pairs. Pedicels ciliate, tip discoid. Fertile spikelets 2-flowered, comprising 1 fertile floret, lower floret male, upper fertile, without rhachilla extension, elliptic or oblong, slightly dorsally compressed, acute, 1.52.2 mm long, falling entire. Rhachilla internodes brief up to lowest fertile floret.
Glumes dissimilar, thinner than fertile lemma. Lower glume orbicular, clasping, 0.40.6 mm long, 1525% of length of spikelet, hyaline, 01-nerved. Lower glume lateral nerves absent. Lower glume apex truncate. Upper glume ovate, 1.72.2 mm long, 100% of length of spikelet, membranous, 7-nerved. Upper glume surface glabrous. Upper glume apex acute, muticous.
Basal sterile floret 1, with palea. Lemma of lower sterile floret similar to upper glume, ovate, 1.72.2 mm long, 100% of length of spikelet, membranous, 5-nerved, glabrous, acute. Fertile lemma elliptic, 12 mm long, indurate. Lemma surface rugulose or rugose. Lemma margins involute. Lemma apex acute, mucronate. Palea involute, indurate, without keels.
Africa, Temperate Asia, Tropical Asia, Australasia, Pacific, North America, South America.
Western Australia, Northern Territory, Queensland.
Western Australia: Gardner, Fitzgerald. Giles. Northern Territory: Darwin & Gulf, Victoria River. Queensland: Burke, North Kennedy, South Kennedy, Port Curtis, Leichhardt, Moreton.
Native (?). Native to Asia but now occurs throughout the tropics. Flowers Jan.Aug.
Inflorescence and detail of inflorescence (scanned specimen)
© Queensland Herbarium
by D. Sharp