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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 meeboldii
HABIT Annual. Culms decumbent; weak; 15–20 cm long; 6–8 -noded. Culm-nodes bearded. Leaf-sheaths glabrous on surface, or pilose. Ligule a ciliolate membrane. Leaf-blade base amplexicaul. Leaf-blades lanceolate, or ovate; 2–3.5 cm long; 10–13 mm wide; flaccid. Leaf-blade surface pilose; hairy abaxially; with tubercle-based hairs. Leaf-blade margins tuberculate-ciliate.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 2; paired; 3–4.5 cm long. Rhachis fragile at the nodes; ciliate on margins. Rhachis hairs 2–2.5 mm long. Rhachis internodes filiform; 4 mm long.
Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform; 3 mm long; ciliate.
STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; shorter than fertile. Companion sterile spikelet glumes chartaceous; 7 mm long; keeled; 9 -veined. Companion sterile spikelet lemmas 2; enclosed by glumes.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 9.5–10 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; coriaceous; 2-keeled. Lower glume intercarinal veins distinct; 3 in number. Lower glume surface spinose, or muricate; rough on flanks. Lower glume apex dentate; 2 -fid. Upper glume lanceolate; chartaceous; 1-keeled; keeled above; 3 -veined. Upper glume primary vein scaberulous. Upper glume margins ciliolate. Upper glume apex acute.
FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 4.5 mm long; hyaline; 0 -veined; without midvein; without lateral veins; obtuse. Fertile lemma lanceolate; 6 mm long; hyaline; without keel; 1 -veined. Lemma apex acute; awned; 1 -awned. Principal lemma awn dorsal; arising 0.2 way up back of lemma; geniculate; 19–22 mm long overall; with twisted column. Column of lemma awn 7–8 mm long; glabrous. Palea absent or minute.
FLOWER Anthers 3; 2.5 mm long.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION Asia-tropical: India.
NOTES Andropogoneae. Stapf 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
