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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 leptostachys

HABIT Perennial. Rhizomes elongated; scaly. Culms erect, or geniculately ascending; 40–70 cm long. Leaf-sheaths glabrous on surface, or pubescent. Leaf-sheath oral hairs ciliate. Ligule a ciliolate membrane; 0.5 mm long. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades linear, or lanceolate; 6–15 cm long; 5–10 mm wide. Leaf-blade surface glabrous, or pubescent. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence composed of racemes. Peduncle pubescent above.

Racemes 4–10; digitate; 8–10 cm long. Central inflorescence axis 2–4 cm long. Rhachis fragile at the nodes; pilose on surface. Rhachis hairs tawny. Rhachis internodes linear. Rhachis internode tip transverse.

Spikelets in pairs. Fertile spikelets sessile and pedicelled; 2 in the cluster. Pedicels linear; angular; ciliate.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 3–4 mm long; falling entire; deciduous from the base, or with accessory branch structures. Spikelet callus base obtuse; attached transversely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 1 length of spikelet; chartaceous; 2-keeled; keeled above; 2–4 -veined. Lower glume surface villous. Lower glume margins ciliolate. Lower glume hairs tawny; 5–10 mm long. Lower glume apex erose; truncate. Upper glume oblong; 1 length of spikelet; 1-keeled; 1–3 -veined. Upper glume lateral veins absent, or obscure. Upper glume surface pilose. Upper glume margins ciliolate. Upper glume hairs tawny. Upper glume apex truncate, or obtuse; muticous.

FLORETS Basal sterile florets with vestigial lower floret; barren; without significant palea. Fertile lemma oblong; 1 mm long; hyaline; without keel. Lemma margins ciliolate. Lemma apex lobed; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 10–20 mm long overall; with a straight or slightly twisted column. Column of lemma awn 1 mm long; glabrous. Palea absent or minute.

FLOWER Anthers 3.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Andropogoneae. Reeder 1993.

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