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FOC | Family List | FOC Vol. 22 | Poaceae

219. Rottboellia Linnaeus f., Suppl. Pl. 114. 1782 [“1781”].

筒轴茅属 tong zhou mao shu

Authors: Bi-xing Sun & Sylvia M. Phillips

Annual. Culms robust. Leaf blades linear, flat; ligule membranous. Inflorescence of single axillary racemes; racemes cylindrical, fragile, transversely articulated; rachis internodes stout, flattened or semi-cylindrical, deeply cupped at apex, truncate at base with a prominent central peg broadened into a flared elaiosome. Sessile spikelet sunk within rachis; lower glume ovate-oblong, leathery, shallowly convex, marginally 2-keeled, apex obtuse or acute, narrowly winged; upper glume boat-shaped; lower floret staminate, palea present; upper floret with entire awnless lemma. Pedicelled spikelet tightly erect, as long as or shorter than sessile spikelet, herbaceous; pedicel broad, of similar texture to, and partly or wholly adnate to adjacent rachis internode.

Five species: Old World tropics; introduced in the Caribbean region; two species (one endemic) in China.

1 Sessile spikelet ovate, 5–6 mm, pallid; lower glume of sessile spikelet scaberulous on back; leaf sheaths hispid.   1 R. cochinchinensis
+ Sessile spikelet oblong-lanceolate, 7–10 mm, dull green; lower glume of sessile spikelet smooth on back; leaf sheaths ± glabrous.   2 R. laevispica

Lower Taxa


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