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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.
Bouteloua warnockii
HABIT Perennial; caespitose. Culms erect; 20–35(–50) cm long. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs; 1–1.5 mm long. Leaf-blades straight, or curved; involute; 5–15(–25) cm long; 1–1.5(–2.5) mm wide; glaucous. Leaf-blade margins tuberculate-ciliate; hairy at base. Leaf-blade apex attenuate; filiform.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 9–15(–25); borne along a central axis; unilateral; 0.4–0.6 cm long; bearing 2–6 fertile spikelets on each. Central inflorescence axis 5–10 cm long; tip filiform. Rhachis deciduous from axis; angular; terminating in a barren extension; extension subulate. Spikelet packing broadside to rhachis; lax.
Spikelets appressed; solitary. Fertile spikelets sessile.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 5–6.5 mm long; falling entire; deciduous with accessory branch structures.
GLUMES Glumes similar; shorter than spikelet; thinner than fertile lemma; gaping. Lower glume lanceolate; 3–5 mm long; 0.7–0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 4–6 mm long; 0.7–0.8 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acuminate.
FLORETS Fertile lemma ovate; 5–6.5 mm long; coriaceous; keeled; 3 -veined. Lemma apex dentate; 3 -fid; awned; 3 -awned. Principal lemma awn 0.5–1 mm long overall. Lateral lemma awns arising on margin of lemma; 0.5–1 mm long; subequal to principal. Palea apex with excurrent keel veins. Rhachilla extension glabrous. Apical sterile florets 1 in number; barren; rudimentary. Apical sterile lemmas awned; 3 -awned. Apical sterile lemma awns unequal; 4–5 mm long.
FLOWER Anthers purple.
FRUIT Caryopsis with adherent pericarp; ovoid; 3.2–3.6 mm long.
DISTRIBUTION North America: south-central USA.
NOTES Cynodonteae. Gould.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
