Phacelurus cambogiensis

HABIT Perennial; caespitose. Culms erect; 60–100 cm long. Ligule a fringe of hairs. Leaf-blades 30–50 cm long; 6–8 mm wide. Leaf-blade surface scaberulous; rough on both sides.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; 3.5–5 cm long. Rhachis semiterete; glabrous on surface. Rhachis internodes oblong. Rhachis internode tip transverse; flat.

Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels linear; semiterete.

STERILE SPIKELETS Companion sterile spikelets well-developed; comprising 2 subequal glumes without lemmas, or containing empty lemmas; lanceolate; laterally compressed; 20–40 mm long; longer than fertile; separately deciduous. Companion sterile spikelet callus linear (5–10mm); truncate. Companion sterile spikelet glumes coriaceous; winged on keels; attenuate. Companion sterile spikelet lemmas 0–2; enclosed by glumes.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 22–24 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus pubescent; base truncate; attached transversely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume ovate; 1 length of spikelet; coriaceous; 2-keeled; winged on keel; winged narrowly; winged above; 10–12 -veined. Lower glume apex caudate. Upper glume oblong; 12–15 mm long; chartaceous; 1-keeled. Upper glume apex acuminate.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret oblong; 0.7–1 mm long; hyaline; 5–7 -veined; acuminate; mucronate. Fertile lemma oblong; 0.5–1 mm long; hyaline; without keel. Lemma apex acuminate. Palea hyaline.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Andropogoneae. WDC.

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