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Descriptions

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

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

Arthraxon epectinatus

HABIT Perennial. Culms decumbent; 40–60 cm long. Culm-nodes bearded. Leaf-sheaths mostly shorter than adjacent culm internode; glabrous on surface; outer margin hairy. Ligule a ciliolate membrane. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 6–9 cm long; 7–12 mm wide. Leaf-blade surface glabrous. Leaf-blade margins tuberculate-ciliate; hairy at base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2–6; digitate; 4–10 cm long. Rhachis fragile at the nodes; ciliate on margins. Rhachis internodes filiform.

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

STERILE SPIKELETS Companion sterile spikelets well-developed; lanceolate; 4.5 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 5–5.5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus attached transversely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; chartaceous; without keels; 5–7 -veined. Lower glume surface convex; glabrous. Lower glume apex acuminate. Upper glume lanceolate; membranous; 1-keeled; keeled above. Upper glume margins ciliate. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 3.5 mm long; hyaline; 2 -veined; obtuse. Fertile lemma oblong; 4.5 mm long; hyaline; without keel; 1 -veined. Lemma apex dentate; 2 -fid; acute; awned; 1 -awned. Principal lemma awn dorsal; arising 0.2 way up back of lemma; geniculate; 10 mm long overall; with a straight or slightly twisted column, or with twisted column. Column of lemma awn glabrous. Palea absent or minute.

FLOWER Anthers 2; 3.5 mm long; yellow.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: China.

NOTES Andropogoneae. Chen & Jin 1996.

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