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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.
Gymnopogon aristiglumis
HABIT Perennial. Rhizomes short. Culms decumbent; 70–100 cm long. Leaves distichous. Leaf-sheaths without keel; outer margin glabrous. Leaf-sheath oral hairs ciliate. Ligule a ciliate membrane; 0.2 mm long. Leaf-blade base broadly rounded. Leaf-blades linear, or lanceolate; 4–10 cm long; 4–12 mm wide; stiff. Leaf-blade midrib indistinct. Leaf-blade surface glabrous. Leaf-blade margins scabrous.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 8–12; borne along a central axis; spreading, or drooping; flexuous; unilateral; 20–40 cm long. Central inflorescence axis 10–20 cm long. Rhachis angular; scabrous on margins. Spikelet packing broadside to rhachis; distant.
Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels oblong.
STERILE SPIKELETS Basal sterile spikelets rudimentary.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 2.5–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.
GLUMES Glumes persistent; similar; exceeding apex of florets; gaping. Lower glume linear; 2–3 mm long; 0.7–0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 5–10 mm long. Upper glume linear; 2.5–4 mm long; 1.2–1.6 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 5–15 mm long.
FLORETS Fertile lemma elliptic; 2–2.5 mm long; membranous; keeled; 3 -veined. Lemma margins eciliate, or ciliate. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn subapical; flexuous; 10–20 mm long overall. Palea 0.9 length of lemma. Apical sterile florets 1 in number; barren; rudimentary. Apical sterile lemmas awned; 1 -awned. Apical sterile lemma awns 10–20 mm long.
FLOWER Anthers 3; 0.5 mm long.
FRUIT Caryopsis with adherent pericarp; 1.7 mm long.
DISTRIBUTION South America: Mesoamericana.
NOTES Cynodonteae. Smith.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
