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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 siamensis

HABIT Perennial; caespitose. Butt sheaths woolly; with yellow hairs; persistent and investing base of culm. Culms erect; 100–200 cm long. Culm-internodes solid. Ligule an eciliate membrane. Leaf-blades 50–100 cm long; 5–10 mm wide. Leaf-blade surface pilose; hairy adaxially; with tubercle-based hairs. Leaf-blade margins smooth, or scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes. Peduncle hirsute above.

Racemes 5–7; digitate; 10–20 cm long. Rhachis fragile at the nodes; pilose on surface; ciliate on margins. Rhachis hairs purple; 4 mm long. 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; 6.5 mm long; falling entire; deciduous from the base, or with accessory branch structures. Spikelet callus bearded; base obtuse; attached transversely.

GLUMES Glumes dissimilar; reaching apex of florets; firmer than fertile lemma. Lower glume elliptic; 1 length of spikelet; chartaceous; 2-keeled; keeled above; 2 -veined. Lower glume surface flat, or concave; pilose. Lower glume hairs purple. Lower glume apex dentate; 2 -fid. Upper glume oblong; 1 length of spikelet; yellow; 1-keeled; keeled above; 3 -veined. Upper glume primary vein scaberulous. Upper glume surface pilose; hairy below. Upper glume muticous.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 5 mm long; hyaline; 0 -veined; without midvein; without lateral veins; ciliate on margins; obtuse. Fertile lemma oblong; 3.5 mm long; hyaline; without keel; 1 -veined. Lemma apex lobed; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 35 mm long overall; with twisted column. Column of lemma awn 18 mm long; glabrous.

FLOWER Anthers 3; 4.5 mm long.

DISTRIBUTION Asia-temperate: China. Asia-tropical: Indo-China.

NOTES Andropogoneae. Bor 1993.

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