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Descriptions

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

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

Eulalia tetraseta

HABIT Perennial; caespitose. Culms 40–70 cm long; 4–5 -noded. Culm-nodes pubescent. Leaf-sheaths 4–11 cm long; smooth; pilose. Ligule an eciliate membrane; 0.2 mm long; truncate. Leaf-blades filiform, or linear; conduplicate; 10–30 cm long; 1–3 mm wide. Leaf-blade surface pilose; sparsely hairy; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; 3–11.5 cm long. Rhachis fragile at the nodes; ciliate on margins. Spikelet packing lax. Rhachis internodes filiform; 0.75 length of fertile spikelet.

Spikelets in pairs. Fertile spikelets sessile and pedicelled; 2 in the cluster. Pedicels filiform; 1 length of internode; ciliate.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 3.5–4.5 mm long; falling entire; deciduous from the base, or with accessory branch structures. Spikelet callus square; 1 mm long; base obtuse; attached transversely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma; shiny. Lower glume lanceolate; 1 length of spikelet; chartaceous; 2-keeled. Lower glume primary vein pubescent. Lower glume surface with a longitudinal median groove. Lower glume margins ciliate. Lower glume apex dentate; 2 -fid; awned; 2 -awned. Lower glume awn 5–9 mm long. Upper glume lanceolate; chartaceous; 1-keeled. Upper glume margins ciliate. Upper glume apex dentate; 2 -fid; awned; 1 -awned.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 0.66 length of spikelet; hyaline; 0 -veined; without midvein; without lateral veins; obtuse. Fertile lemma linear, or lanceolate; hyaline; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 18–30 mm long overall; with twisted column. Column of lemma awn scabrous; glabrous. Palea absent or minute.

FLOWER Anthers 3; 3.5 mm long; orange.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Andropogoneae. Veldkamp 2003.

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