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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Andropogon indetonsus
HABIT Perennial; caespitose. Culms erect; 100–200 cm long. Leaf-sheaths mostly shorter than adjacent culm internode; glabrous on surface. Ligule an eciliate membrane; 1.8–2 mm long. Leaf-blades 30–40 cm long; 10–15 mm wide. Leaf-blade surface glabrous; hairless except near base. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
INFLORESCENCE Synflorescence compound; linear; 30 cm long. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole. Spatheole linear.
Racemes 2–3; paired, or digitate; straight, or arcuate; 2.5–8 cm long. Rhachis fragile at the nodes; scabrous on surface; glabrous on surface, or pilose on surface; villous on margins. Rhachis internodes clavate; 3–5 mm long. Rhachis internode tip transverse; cupuliform; with simple rim.
Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels linear; 3–3.5 mm long.
STERILE SPIKELETS Companion sterile spikelets well-developed; male; elliptic; 3.5–5 mm long; longer than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous. Companion sterile spikelet lemmas enclosed by glumes; 3–3.5 mm long.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 4.5–5.5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus 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; 6 -veined. Lower glume surface concave. Upper glume linear; coriaceous; 1-keeled. Upper glume primary vein scabrous. Upper glume muticous.
FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 4 mm long; hyaline; 0 -veined; without midvein; without lateral veins. Fertile lemma lanceolate; 3–3.5 mm long; hyaline; without keel. Lemma apex lobed; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 10–15 mm long overall; with a straight or slightly twisted column. Column of lemma awn glabrous. Palea 1.5 mm long; hyaline; 0 -veined.
FLOWER Lodicules 2; 0.5–0.8 mm long. Anthers 3; 2–2.2 mm long.
DISTRIBUTION South America: northern South America and Brazil.
NOTES Andropogoneae. Sohns 2004.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
