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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 aurea

HABIT Perennial; mat forming, or caespitose. Butt sheaths pubescent, or pilose. Culms 50–150 cm long. Ligule a ciliolate membrane. Leaf-blades 3–15 cm long; 3–6 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acuminate; filiform.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2–4(–15); digitate; 3–14 cm long. Rhachis fragile at the nodes; subterete; pilose on surface; villous on margins. Rhachis hairs dark brown; 1 mm long. Rhachis internodes linear. Rhachis internode tip transverse.

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

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 3.5–4.5 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 elliptic; 1 length of spikelet; cartilaginous; dark brown; 2-keeled; keeled above. Lower glume intercarinal veins distinct. Lower glume surface pilose. Lower glume hairs dark brown. Lower glume apex truncate. Upper glume elliptic. Upper glume surface pilose. Upper glume hairs dark brown. Upper glume muticous.

FLORETS Basal sterile florets with vestigial lower floret. Fertile lemma cuneate; 1 mm long; hyaline; without keel; 3 -veined. Lemma margins ciliate; hairy above. Lemma apex lobed; 2 -fid; incised 0.3 of lemma length; muticous, or awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 0–20 mm long overall; with twisted column. Column of lemma awn hispidulous. Palea absent or minute.

FRUIT Caryopsis with adherent pericarp; oblong. Embryo 0.5 length of caryopsis. Hilum punctiform.

DISTRIBUTION Africa: west-central tropical, east tropical, southern tropical, south, and western Indian ocean. Asia-tropical: Indo-China and Malesia. Australasia: Australia.

NOTES Andropogoneae. FTEA.

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