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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 scabriglumis

HABIT Perennial; caespitose. Culms erect; 70–80 cm long. Lateral branches sparse. Leaf-sheaths keeled; glabrous on surface. Ligule an eciliate membrane; 1 mm long. Leaf-blades 18–20 cm long; 4–5 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2; paired; 3–5 cm long. Rhachis fragile at the nodes; ciliate on margins. Rhachis hairs 2 mm long. Rhachis internodes clavate; 4 mm long. Rhachis internode tip transverse; cupuliform; with simple rim.

Spikelets appressed; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels clavate; 3 mm long; ciliate; with 2 mm long hairs.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; 7 mm long; longer than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; glabrous; acute; mucronate, or awned; one glume awned; with 0.5–1 mm long awn. 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; 6 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 laterally. Lower glume primary vein scabrous. Lower glume intercarinal veins distinct. Lower glume surface flat, or 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; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 15–18 mm long overall; with twisted column. Column of lemma awn glabrous.

FLOWER Anthers 3.

DISTRIBUTION South America: western South America.

NOTES Andropogoneae. Swallen 1995.

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