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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 aequatoriensis

HABIT Perennial; caespitose. Culms erect; 55–100 cm long. Lateral branches ample. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1–2 mm long; truncate. Leaf-blades 15–30 cm long; 3–8 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous.

INFLORESCENCE Synflorescence compound; linear. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole. Spatheole linear; 20–30 cm long. Peduncle 5–10 cm long; glabrous.

Racemes 2–3; paired, or digitate; 2–4 cm long. Rhachis fragile at the nodes; villous on margins. Rhachis hairs 3–4 mm long. Rhachis internodes linear; 3–4 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; 3.5–4 mm long; villous.

STERILE SPIKELETS Companion sterile spikelets represented by single glumes; linear; 1–4 mm long; shorter than fertile. Companion sterile spikelet glumes herbaceous; 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 pubescent; 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 primary vein scabrous. Lower glume surface concave. Upper glume linear; membranous; 1-keeled. Upper glume muticous.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline; 2 -veined. Fertile lemma lanceolate; hyaline; without keel. Lemma apex lobed; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; straight, or flexuous, or geniculate; 5–8 mm long overall; with twisted column. Column of lemma awn glabrous.

FLOWER Anthers 3.

DISTRIBUTION South America: western South America.

NOTES Andropogoneae. Hitchcock 1995.

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