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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 ingratus

HABIT Perennial. Culms erect; slender; 70–100 cm long. Lateral branches sparse. Ligule an eciliate membrane. Leaf-blades 14–35 cm long; 2–3 mm wide. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2–3; paired, or digitate; 5–6 cm long. Rhachis fragile at the nodes; villous on margins. Rhachis hairs 5 mm long. Rhachis internodes linear. 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; villous.

STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas; linear, or lanceolate; 5 mm long; shorter than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; scaberulous; glabrous; acute; muticous. Companion sterile spikelet lemmas enclosed by glumes; 3.5 mm long.

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 bearded; 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; asperulous. 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; incised 0.33 of lemma length; muticous, or awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 8–12 mm long overall; with twisted column. Column of lemma awn glabrous.

FLOWER Anthers 3.

DISTRIBUTION South America: Brazil.

NOTES Andropogoneae. Gr Bahia 1995.

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