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Descriptions

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

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

Hymenachne assamica

HABIT Perennial. Culms decumbent; 20–40 cm long; rooting from lower nodes. Culm-internodes solid. Leaf-sheaths glabrous on surface; outer margin hairy. Ligule an eciliate membrane. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 5–10 cm long; 3–5 mm wide. Leaf-blade surface pubescent; sparsely hairy; hairy abaxially. Leaf-blade margins unthickened; glabrous, or ciliate; hairy at base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; continuous, or interrupted; 7–10 cm long; 0.7–1 cm wide. Panicle axis scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels oblong; scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; acute; 3 mm long; falling entire.

GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; clasping; 1.5 mm long; 0.5 length of spikelet; hyaline; without keels; 3 -veined. Lower glume lateral veins ribbed. Lower glume surface smooth, or asperulous; rough on veins. Lower glume apex acute. Upper glume elliptic; 3 mm long; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume lateral veins ribbed. Upper glume surface smooth. Upper glume apex acute; awned; 1 -awned. Upper glume awn 0.5 mm long.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; oblong; 3 mm long; 1 length of spikelet; membranous; 5 -veined; ribbed; smooth; obtuse. Fertile lemma ovate; 2.5 mm long; cartilaginous; pallid; without keel; 3 -veined. Lemma margins involute. Lemma apex acute. Palea separating from lemma above; involute; 0.8 length of lemma; cartilaginous; 2 -veined; without keels. Palea apex acuminate.

FLOWER Anthers 3; 0.75 mm long.

DISTRIBUTION Asia-temperate: China. Asia-tropical: India and Indo-China.

NOTES Paniceae. Fl Assam.

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