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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 diuturnus

HABIT Perennial; caespitose; clumped densely. Culms erect; 20–65 cm long. Leaves cauline. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs lacking, or ciliate. Leaf-sheath auricles erect. Ligule a ciliate membrane; 1.5–1.7 mm long. Leaf-blades 5–15 cm long; 0.5–5 mm wide. Leaf-blade midrib prominent beneath. Leaf-blade surface smooth, or scaberulous; rough on both sides.

INFLORESCENCE Inflorescence composed of racemes; terminal and axillary.

Racemes (1–)2; paired; 4–5 cm long. Rhachis fragile at the nodes; villous on margins. Rhachis hairs evenly distributed; 2 mm long. Rhachis internodes filiform. 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; 3–5 mm long; villous; hairy all along.

STERILE SPIKELETS Companion sterile spikelets represented by single glumes; linear; 1.1–2.3 mm long; shorter than 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; 4.1–6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus glabrous; 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 intercarinal veins absent. 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; 0.9–1.5 mm long; hyaline; 2 -veined; ciliolate on margins. Fertile lemma lanceolate; hyaline; without keel; 3 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 7.5–14 mm long overall; with twisted column. Column of lemma awn glabrous. Palea 1–2 mm long.

FLOWER Lodicules 2; cuneate; 0.5–0.7 mm long; fleshy. Anthers 3; 1–1.5 mm long.

DISTRIBUTION South America: northern South America.

NOTES Andropogoneae. Sohns 1995.

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