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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Arthraxon villosus
HABIT Annual. Culms decumbent, or rambling; 5–40 cm long. Culm-nodes bearded. Leaf-sheaths hirsute; with tubercle-based hairs. Ligule a ciliolate membrane. Leaf-blade base broadly rounded. Leaf-blades ovate; 0.5–3 cm long; 2–8 mm wide. Leaf-blade surface hirsute; densely hairy. Leaf-blade margins ciliate. Leaf-blade apex acute.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 2–3; paired, or digitate; 1–4 cm long. Rhachis fragile at the nodes; villous on margins. Rhachis internodes linear; 3 mm long.
Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels linear; 2 mm long; villous.
STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas; lanceolate; 4 mm long; shorter than fertile. Companion sterile spikelet glumes keeled; 7 -veined; scabrous. Companion sterile spikelet lemmas 2; enclosed by glumes; muticous.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus base truncate; attached transversely.
GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; chartaceous; without keels; 7–9 -veined. Lower glume lateral veins obscure. Lower glume surface convex; scabrous; rough on flanks; villous. Lower glume margins ciliate. Lower glume apex acute. Upper glume lanceolate; chartaceous; 1-keeled; keeled above. Upper glume apex acute.
FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 2–2.5 mm long; hyaline. Fertile lemma lanceolate; 3–3.5 mm long; hyaline; without keel; 1 -veined. Lemma apex lobed; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.2 way up back of lemma; geniculate; 12–15 mm long overall; with twisted column. Column of lemma awn 5–6 mm long; glabrous. Palea absent or minute.
FLOWER Anthers 3; 1 mm long.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION Asia-tropical: India.
NOTES Andropogoneae. Nair 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
