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Descriptions

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

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

Elionurus planifolius

HABIT Perennial; caespitose. Rhizomes short. Butt sheaths persistent and investing base of culm; with compacted dead sheaths. Culms erect; 40–80 cm long. Lateral branches lacking. Ligule a fringe of hairs. Leaf-blades 20–40 cm long; 2–4(–5) mm wide. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; 8–10 cm long; 3–4 mm wide. 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; elliptic; dorsally compressed; 4.5 mm long; shorter than fertile; deciduous with the fertile. Companion sterile spikelet glumes chartaceous; pilose. Companion sterile spikelet lemmas 2; enclosed by glumes.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 5 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; 9 -veined. Lower glume surface villous. Lower glume apex obtuse. Upper glume lanceolate; 1-keeled. Upper glume surface hispid. Upper glume apex obtuse.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; 3.5 mm long; hyaline; 0 -veined; without midvein; without lateral veins. Fertile lemma oblong; 3.3 mm long; hyaline; without keel; 3 -veined. Palea absent or minute.

FLOWER Anthers 3; 2.5 mm long.

DISTRIBUTION South America: northern South America, western South America, Brazil, and southern South America.

NOTES Andropogoneae. Renvoize 1994.

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