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Descriptions

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

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

Andropogon lehmannii

HABIT Perennial. Basal innovations extravaginal. Culms 80–300 cm long. Lateral branches sparse. Leaf-sheaths glabrous on surface. Ligule a ciliolate membrane; truncate. Leaf-blades 20–40 cm long; 5–10 mm wide. Leaf-blade margins scabrous.

INFLORESCENCE Synflorescence compound; paniculate. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole. Spatheole linear; 5–7 cm long.

Racemes 2; paired; 4–6 cm long. Rhachis fragile at the nodes; villous on margins. Rhachis hairs 4 mm long. Rhachis internodes filiform; 3.5 mm long. Rhachis internode tip transverse; cupuliform; with simple rim.

Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform; 4 mm long; villous; with 4 mm long hairs.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; 6–7 mm long; longer than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; 7 -veined; glabrous; acute; muticous. Companion sterile spikelet lemmas enclosed by glumes.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 5–6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus pilose; base obtuse; inserted.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; coriaceous; 2-keeled; keeled laterally. Lower glume surface concave. Upper glume linear; coriaceous; 1-keeled. Upper glume muticous.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline. Fertile lemma lanceolate; 4 mm long; hyaline; without keel. Lemma apex lobed; 2 -fid; incised 0.5 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 7–12 mm long overall; with twisted column. Column of lemma awn glabrous.

FLOWER Anthers 3.

DISTRIBUTION South America: western South America.

NOTES Andropogoneae. Pilger 1995.

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