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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 barretoi
HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms erect; robust; 150–200 cm long. Culm-nodes glabrous. Lateral branches sparse. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1.5–3 mm long; truncate. Leaf-blade base tapering to the midrib. Leaf-blades 10–15 mm wide. Leaf-blade surface glabrous; hairless except near base. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
INFLORESCENCE Synflorescence compound; linear. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole. Spatheole linear.
Racemes 5–16; digitate; 7–12 cm long; bearing 12–25 fertile spikelets on each. Rhachis fragile at the nodes; ciliate on margins. Rhachis internodes linear. 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.
STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; 4–7 mm long; longer than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; acute; muticous. Companion sterile spikelet lemmas enclosed by glumes; muticous.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets linear, or lanceolate; dorsally compressed; 3.5–6 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 lanceolate; 1 length of spikelet; coriaceous; 2-keeled; keeled laterally. Lower glume intercarinal veins distinct; 2 in number. Lower glume surface concave; asperulous; rough above. Upper glume lanceolate; coriaceous; 1-keeled.
FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline. Fertile lemma lanceolate; hyaline; without keel. Lemma margins ciliate. Lemma apex lobed; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; curved; 4–8 mm long overall. Palea 1 length of lemma.
FLOWER Anthers 3; 3 mm long.
DISTRIBUTION South America: Brazil.
NOTES Andropogoneae. Norrmann & Quarin 2005.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
