GrassBase - The Online World Grass Flora


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

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

Hemarthria depressa

HABIT Perennial. Culms 40–50 cm long. Culm-internodes elliptical in section; distally glabrous, or pubescent. Culm-nodes glabrous. Leaf-sheaths loose; longer than adjacent culm internode; keeled; outer margin glabrous, or hairy. Ligule a ciliolate membrane; 0.5–1.5 mm long. Leaf-blades conduplicate; 5–25 cm long; 1–3 mm wide. Leaf-blade surface scabrous; glabrous, or pubescent; sparsely hairy; hairy adaxially, or abaxially, or on both sides.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; smoothly terete; 10–18 cm long. Rhachis fracturing into irregular segments; flattened. Rhachis internodes columnar; 7–8 mm long. Rhachis internode tip oblique; flat.

Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels fused to internode; united wholly; oblong; flattened; tip rectangular.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; 7.7–10.3 mm long; shorter than fertile; deciduous with the fertile. Companion sterile spikelet callus truncate. Companion sterile spikelet glumes herbaceous; keeled; 11–13 -veined. Companion sterile spikelet lemmas 2; enclosed by glumes; 5–7.6 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets linear, or lanceolate; dorsally compressed; 9–12 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus cuneate; 1.5–4 mm long; glabrous; base truncate; attached obliquely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume linear, or lanceolate; 6.9–9 mm long; 1 length of spikelet; coriaceous; 2-keeled; keeled laterally; 9–15 -veined. Lower glume primary vein scabrous. Lower glume surface flat. Lower glume apex acuminate. Upper glume linear; 6.8–9.2 mm long; coriaceous; without keels; 3–5 -veined.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret oblong; 5.2–7.5 mm long; hyaline. Fertile lemma oblong; 4.4–6 mm long; hyaline; without keel; 0 -veined. Palea absent or minute.

FLOWER Anthers 3; 2.7–3.6 mm long.

FRUIT Caryopsis with adherent pericarp; 2 mm long.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Andropogoneae. Heuvel 2002.

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