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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Bothriochloa edwardsiana

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; slender; 35–65 cm long. Culm-nodes glabrous, or pubescent. Leaves mostly basal. Ligule a ciliolate membrane; 1–1.5 mm long. Leaf-blades filiform; 10–25 cm long; 1–2 mm wide; pruinose. Leaf-blade margins ciliate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 3–6; digitate; 6–10 cm long. Central inflorescence axis 0.5–1.8 cm long. Rhachis fragile at the nodes; flattened; ciliate on margins. Rhachis internodes linear. Rhachis internode tip transverse.

Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels linear; flattened; 4.7–5 mm long; with a translucent median line (also present in internodes); ciliate.

STERILE SPIKELETS Companion sterile spikelets well-developed; comprising 2 subequal glumes without lemmas; linear; 3 mm long; shorter than fertile. Companion sterile spikelet glumes smooth, or scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 5–8 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus base obtuse; attached transversely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma; shiny. Lower glume elliptic; 1 length of spikelet; cartilaginous; without keels; keel-less except near apex. Lower glume surface flat; pitted. Upper glume lanceolate; 1-keeled.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline. Fertile lemma linear; hyaline; without keel. Lemma apex entire; awned; 1 -awned. Principal lemma awn apical; geniculate; 20–28 mm long overall; with twisted column. Column of lemma awn glabrous. Palea absent or minute.

FLOWER Anthers 3.

DISTRIBUTION North America: south-central USA. South America: southern South America.

NOTES Andropogoneae. Gr Tex 1993.

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