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Descriptions

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

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

Cleistogenes mucronata

HABIT Perennial; caespitose. Culms erect; 37–45 cm long; 0.5 mm diam. Culm-internodes smooth; distally glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs bearded; 4 mm long. Ligule a fringe of hairs; 0.2–0.3 mm long. Leaf-blades involute; 1.1–6 cm long; 1–1.5 mm wide; stiff. Leaf-blade surface scabrous; rough adaxially; glabrous. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes borne along a central axis; erect, or ascending; unilateral; 2–4 cm long; bearing few fertile spikelets. Central inflorescence axis 8–11 cm long. Rhachis scaberulous on margins. Spikelet packing lax. Raceme-bases pilose.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 8–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1 mm long; scaberulous. Floret callus pubescent.

GLUMES Glumes persistent; dissimilar; shorter than spikelet. Lower glume lanceolate; 3 mm long; 0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4.5 mm long; membranous; keeled; 5 -veined. Lemma midvein scaberulous. Lemma lateral veins obscure. Lemma margins pubescent. Lemma apex entire; mucronate. Palea 2 -veined. Palea keels scabrous; adorned above; with 0.33 of their length adorned. Palea apex emarginate, or truncate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 2 mm long; yellow.

FRUIT Caryopsis with adherent pericarp.

CLEISTOGENES AND VIVIPARY Cleistogenes present; in upper sheaths.

DISTRIBUTION Asia-temperate: China.

NOTES Eragrostideae. Keng 1996.

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