Digitaria jansenii

HABIT Annual; caespitose; clumped loosely. Culms geniculately ascending; 30–60 cm long; rooting from lower nodes. Leaf-sheaths pubescent. Ligule an eciliate membrane; 1.5–2 mm long; erose; truncate. Leaf-blades linear, or lanceolate; 2–10 cm long; 2–6 mm wide. Leaf-blade surface pubescent.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2–4; digitate; unilateral; 6–9 cm long. Rhachis narrowly winged; angular; scabrous on margins.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 5.25–6 mm long; falling entire.

GLUMES Glumes shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.15–0.2 mm long; 0.03 length of spikelet; membranous; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse, or acute. Upper glume ovate; 0.1–0.25 mm long; 0–0.05 length of spikelet; membranous; without keels; 0–1 -veined. Upper glume primary vein absent, or obscure. Upper glume lateral veins absent. Upper glume surface villous. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; 0.9–1 length of spikelet; membranous; 11–13 -veined; scabrous; glabrous; pubescent on margins, or setose on margins; truncate to acute. Fertile lemma elliptic; 5.25–6 mm long; cartilaginous; much thinner on margins; yellow; without keel. Lemma margins flat; covering most of palea. Lemma apex acute. Palea cartilaginous.

FLOWER Anthers 3; 3–3.25 mm long; purple.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Paniceae. Veldkamp 1993.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.