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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Parahyparrhenia tridentata

HABIT Perennial; caespitose. Culms erect; 20–70 cm long. Ligule an eciliate membrane. Leaf-blades 5–13 cm long; 1–3 mm wide. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence composed of racemes; subtended by a spatheole. Spatheole linear; 4–5 cm long; herbaceous.

Racemes 1; single; 1.5 cm long; bearing few fertile spikelets; bearing 5–7 fertile spikelets on each. Rhachis fragile at the nodes; pubescent on margins. Rhachis internodes filiform. Rhachis internode tip oblique; flat.

Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform; glabrous.

STERILE SPIKELETS Basal sterile spikelets well-developed; 2–4 in number; barren. Basal sterile spikelet lower glume muticous; lemmas awnless.

Companion sterile spikelets well-developed; lanceolate; 5 mm long; shorter than fertile; separately deciduous. Companion sterile spikelet callus indistinct; obtuse. Companion sterile spikelet glumes herbaceous; lobed (tridentate); muticous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 6–8 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus cuneate; 1 mm long; pilose; base acute; attached obliquely. Spikelet callus hairs dark brown.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; coriaceous; without keels. Lower glume surface convex. Lower glume apex dentate; 3 -fid. Upper glume lanceolate; coriaceous. Upper glume muticous.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 3–4 mm long; hyaline. Fertile lemma linear; 4–5 mm long; hyaline; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 20–35 mm long overall; with twisted column. Column of lemma awn pubescent. Palea absent or minute.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Andropogoneae. WDC.

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