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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 jubatus
HABIT Annual. Culms rambling; slender; 10–22 cm long. Culm-nodes pubescent. Leaf-sheaths pilose; with simple hairs, or tubercle-based hairs. Ligule a ciliolate membrane; 0.4–0.7 mm long. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 1.4–3.9 cm long; 3–6 mm wide. Leaf-blade surface pubescent; hairy on both sides. Leaf-blade margins ciliate.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 2–3; paired, or digitate; 2 cm long. Rhachis fragile at the nodes; ciliate on margins. Rhachis internodes filiform; 4–5.1 mm long.
Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform; 1.7–2.6 mm long; ciliate.
STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; 3.9–5 mm long; shorter than fertile. Companion sterile spikelet glumes 4–7 -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; laterally compressed; 6–8.4 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus pilose; base truncate; attached transversely. Spikelet callus hairs 1–1.5 mm long.
GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; chartaceous; without keels; 2–4 -veined. Lower glume surface asperulous; rough on veins. Upper glume lanceolate; chartaceous; 1-keeled; keeled above; 3 -veined. Upper glume apex acute.
FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 1.6–2.2 mm long; hyaline; 0 -veined; without midvein; without lateral veins. Fertile lemma lanceolate; 2.2–3.9 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; 75–150 mm long overall; with twisted column. Column of lemma awn 18–46 mm long; glabrous. Palea absent or minute.
FLOWER Anthers 3; 0.7–1.3 mm long.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION Asia-tropical: India.
NOTES Andropogoneae. Welzen 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
