细穗肠须草 xi sui chang xu cao

Chloris unispicea F. Mueller, Fragm. 7: 118. 1870; C. cheesemanii Hackel ex Cheeseman; Enteropogon gracilior Rendle.

Perennial. Culms tufted, delicate, wiry, rooting at lower nodes, densely branched above base, 30–60 cm tall. Leaf sheaths glabrous or tuberculate-pilose, pilose at mouth; leaf blades linear, inrolled or flat, glaucous, 10–15 cm, 1–2 mm wide, scabrous, sometimes tuberculate-pilose on adaxial surface, apex finely acuminate; ligule ca. 0.3 mm. Raceme 1(–4), 4.5–11 cm; rachis triquetrous, scaberulous. Spikelets with 2 florets; lower glume lanceolate, 1.5–3.5 mm, acute; upper glume elliptic-oblong, 3.5–5.5 mm, mucronate; lemma of fertile floret oblong-lanceolate, ca. 3.5 mm, smooth or scabrous above middle; awn 5–10 mm; palea narrowly lanceolate, scabrous on upper part; upper floret reduced to a rudimentary ca. 0.5 mm lemma with 1.3–1.5 mm awn, loosely appressed to fertile floret. Fl. and fr. Sep. 2n = 20.

Dry open slopes. S Taiwan [Australia (Queensland), Cook Island].