GrassBase - The Online World Grass Flora


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

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

Elionurus bilinguis

HABIT Perennial; caespitose. Butt sheaths pallid. Basal innovations extravaginal. Culms erect; 40–80 cm long. Lateral branches ample. Leaf-sheaths without keel; antrorsely scabrous. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs. Leaf-blades 15–30 cm long; 3–4 mm wide; glaucous. Leaf-blade surface scabrous; rough adaxially. Leaf-blade margins scabrous.

INFLORESCENCE Synflorescence compound; scanty. Inflorescence composed of racemes; subtended by a spatheole; embraced at base by subtending leaf. Spatheole linear; 7–9 cm long.

Racemes 1; single; 4–6 cm long. Rhachis fragile at the nodes; subterete; villous on surface. Rhachis internodes linear. Rhachis internode tip oblique; flat; with simple rim.

Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels linear; flattened; villous.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; dorsally compressed; 3.5–5.5 mm long; shorter than fertile; deciduous with the fertile. Companion sterile spikelet glumes chartaceous; glabrous, or villous; ciliate on margins; lobed; 2 -fid; acuminate; awned; one glume awned. Companion sterile spikelet lemmas 2; enclosed by glumes.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 4–6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus cuneate; pubescent; base obtuse; attached obliquely.

GLUMES Glumes dissimilar; reaching apex of florets; firmer than fertile lemma. Lower glume ovate; 1 length of spikelet; chartaceous; 2-keeled; 7 -veined. Lower glume primary vein ciliate. Lower glume surface glabrous, or villous. Lower glume apex lobed; 2 -fid; awned; 2 -awned. Lower glume awn 3–7 mm long. Upper glume lanceolate; 1-keeled. Upper glume surface pilose. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; hyaline; ciliolate on margins. Fertile lemma oblong; hyaline; without keel; 3 -veined. Lemma margins ciliolate. Palea 0.25 length of lemma.

FLOWER Anthers 3; 3 mm long.

DISTRIBUTION South America: Brazil.

NOTES Andropogoneae. Hackel 1994.

ADDITIONAL CHARACTERS Buds clustered at base.

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