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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 appendiculatus

HABIT Perennial; caespitose. Rhizomes short. Basal innovations flabellate. Culms 30–130 cm long. Leaves mostly basal. Leaf-sheaths keeled. Ligule a ciliolate membrane. Leaf-blades flat, or conduplicate; 15–50 cm long; 3–6 mm wide.

INFLORESCENCE Inflorescence composed of racemes; terminal.

Racemes 4–20; digitate; (3–)6–15 cm long. Rhachis fragile at the nodes; ciliate on margins. Rhachis internodes clavate. 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 clavate; ciliate.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; dorsally compressed; 5–7 mm long; as long as fertile. Companion sterile spikelet glumes chartaceous; glabrous; acute; awned; one glume awned; with 1–2 mm long awn. Companion sterile spikelet lemmas 2; enclosed by glumes.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; 5–7 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 oblong; 1 length of spikelet; chartaceous; purple; 2-keeled; keeled dorsally. Lower glume intercarinal veins absent. 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 lanceolate; 5 mm long; hyaline; 2 -veined. Fertile lemma oblong; 1.5 mm long; hyaline; without keel. Lemma apex lobed; 2 -fid; incised 0.33–0.5 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 10–15 mm long overall; with twisted column. Column of lemma awn glabrous.

FLOWER Anthers 3.

DISTRIBUTION Africa: southern tropical and south.

NOTES Andropogoneae. Gr S Afr.

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