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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 pseudapricus

HABIT Annual; caespitose. Culms geniculately ascending; 50–150 cm long. Ligule an eciliate membrane. Leaf-blades 8–40 cm long; 1–5 mm wide. Leaf-blade surface glabrous.

INFLORESCENCE Synflorescence compound. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole; exserted, or embraced at base by subtending leaf. Spatheole linear, or lanceolate; 5 cm long.

Racemes 2; paired; 2–4 cm long. Rhachis fragile at the nodes; ciliate on margins. Rhachis internodes oblong, or cuneate. Rhachis internode tip transverse; crateriform; with simple rim.

Spikelets appressed; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels oblong, or cuneate; ciliate.

STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas, or male; elliptic; dorsally compressed; 4–5 mm long; shorter than fertile. Companion sterile spikelet glumes membranous; glabrous to villous; acute; awned; both glumes awned; with 5–11 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 linear; laterally compressed; 5–6 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 linear; 1 length of spikelet; coriaceous; 2-keeled; keeled dorsally. Lower glume surface deeply depressed; glabrous. Upper glume linear; chartaceous; 1-keeled. Upper glume awned; 1 -awned. Upper glume awn 8–16 mm long.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline; 2 -veined. Fertile lemma oblong; hyaline; without keel. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 30–50 mm long overall; with twisted column. Column of lemma awn glabrous. Palea oblong.

DISTRIBUTION Africa: west tropical, west-central tropical, northeast tropical, east tropical, and southern tropical.

NOTES Andropogoneae. FTEA.

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