Panicum ischaemum Schreb., Spec. Fl. Erlang. 16. 1804.
Annuals; culms tufted, erect or ascending, 30-60 cm high. Sheaths loose, keeled, usually shorter
than internode; ligule membranaceous, ca. 2 mm long; blade 2-10 cm long, 2-5 mm wide, leaf-base
rounded. Racemes 2-5, 1-20 cm long, digitately arranged; rachis 0.8-1.2 mm wide, indurate, margins
scabrous, green; midrib white, narrow, each node with 2-3 spikelets. Spikelets elliptic, 1.5-2.3 mm long,
greyish green or purplish; lower glume minute or absent, translucently membranaceous, veinless; upper
glume equaling spikelet or slightly shorter, narrow, 3-veined, interveins and margins coverd with soft
clavate hairs; lower lemma 5-veined, interveins and margins also clavate hairs; upper floret coriaceous,
blackish brown when mature, equaling spikelet. Caryopsis ca. 1.2 mm long.
TAIPEI: Chinshan, Hsu 1300.
The temperate regions of the world. Taiwan, in open waste places of the northeastern part.