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Descriptions

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

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

Hemarthria hamiltoniana

HABIT Perennial. Stolons present. Culms prostrate; 100 cm long; 5 mm diam.; rooting from lower nodes. Lateral branches ample. Ligule a ciliate membrane. Leaf-blades 20 cm long; 6 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes; subtended by an inflated leaf-sheath.

Racemes 1; single; smoothly terete; 9–14 cm long. Rhachis fracturing into irregular segments; flattened; glabrous on margins. Rhachis internodes oblong; 5–6 mm long; adherent to upper glume of sessile spikelet. 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; 5–6 mm long; tip rectangular.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; 4–7 mm long; longer than fertile; deciduous with the fertile. Companion sterile spikelet callus truncate. Companion sterile spikelet glumes herbaceous; attenuate; awned; one glume awned; with 1–2 mm long awn. Companion sterile spikelet lemmas 2; enclosed by glumes.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; 5–6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus cuneate; pubescent; base truncate; attached obliquely. Spikelet callus hairs tawny.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 1 length of spikelet; herbaceous; 2-keeled; keeled laterally; winged on keel; winged narrowly. Lower glume intercarinal veins distinct. Lower glume surface flat. Lower glume apex obtuse and rostrate (abruptly constricted to a blunt tip). Upper glume oblong; membranous; without keels; 3 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline; obtuse. Fertile lemma oblong; hyaline; without keel; 0 -veined. Lemma apex obtuse. Palea absent or minute.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. WDC 1993.

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