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Descriptions

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

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

Bouteloua reflexa

HABIT Perennial; caespitose. Rootstock evident. Culms erect; 60–120 cm long; 4–9 -noded. Ligule a ciliolate membrane. Leaf-blades 20–30 cm long; 2–6 mm wide.

INFLORESCENCE Inflorescence composed of racemes.

Racemes numerous; 40–100; borne along a central axis; deflexed; cuneate; unilateral; 0.6–1 cm long; bearing few fertile spikelets; bearing 1–5 fertile spikelets on each (per raceme). Central inflorescence axis 15–20 cm long. Rhachis deciduous from axis; flattened; terminating in a barren extension; extension bristle-like. Spikelet packing broadside to rhachis.

Spikelets ascending; solitary. Fertile spikelets sessile.

STERILE SPIKELETS Basal sterile spikelets well-developed; 4–6 in number; deciduous with the fertile; barren, or male; equalling fertile.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 4–5 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes similar; shorter than spikelet; thinner than fertile lemma; gaping. Lower glume lanceolate; 2–3 mm long; 0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 2.5–3.5 mm long; 0.6–0.7 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 4–5 mm long; coriaceous; without keel; 3 -veined. Lemma apex dentate; 3 -fid; mucronate, or awned; 3 -awned. Principal lemma awn 0.5 mm long overall. Lateral lemma awns arising on apex of lobes; 0.5 mm long; subequal to principal. Rhachilla extension glabrous. Apical sterile florets 1 in number; barren; rudimentary. Apical sterile lemmas awned; 1 -awned. Apical sterile lemma awns 1–4.5 mm long.

FLOWER Anthers orange.

FRUIT Caryopsis with adherent pericarp; 2.5 mm long.

DISTRIBUTION North America: Mexico.

NOTES Cynodonteae. Gould.

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