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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 glaziovii

HABIT Perennial. Basal innovations intravaginal. Culms 150–200 cm long; 5–6 mm diam. Leaf-sheaths smooth; glabrous on surface. Ligule a ciliolate membrane. Leaf-blades 15–50 cm long; 4–7 mm wide. Leaf-blade surface pilose; hairy abaxially. Leaf-blade apex abruptly acute.

INFLORESCENCE Synflorescence compound; linear; 20–50 cm long. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole; enclosed. Spatheole lanceolate; 2.5–3 cm long.

Racemes 2; paired; 2 cm long. Rhachis fragile at the nodes; villous on margins. Rhachis hairs on upper part of internode; 4 mm long. Rhachis internodes linear; 3 mm long. Rhachis internode tip transverse; cupuliform; with simple rim.

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

STERILE SPIKELETS Companion sterile spikelets represented by single glumes; linear; 4 mm long; as long as fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; glabrous; acute; muticous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 4–5 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 dorsally. 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; hyaline; without keel. Lemma apex lobed; 2 -fid; incised 0.33 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 9–10 mm long overall; with twisted column. Column of lemma awn glabrous.

FLOWER Anthers 3.

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

NOTES Andropogoneae. WDC 1995.

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