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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 chapmanianus
HABIT Annual, or perennial; culms solitary, or caespitose. Rhizomes absent. Culms geniculately ascending, or decumbent; 20–60 cm long. Leaves distichous. Leaf-sheaths without keel; outer margin glabrous. Leaf-sheath oral hairs lacking. Ligule a ciliate membrane; 0.2–0.3 mm long. Leaf-blade base broadly rounded. Leaf-blades lanceolate; (1.3–)2–7(–8.5) cm long; 2–6 mm wide; stiff. Leaf-blade midrib indistinct.
INFLORESCENCE Inflorescence composed of racemes.
Racemes (5–)12–26; borne along a central axis; ascending; straight; unilateral; (6–)11–17(–21) cm long. Rhachis angular; scabrous on margins. Spikelet packing broadside to rhachis; lax.
Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels oblong.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 2.7–5.9 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; (2.7–)3.2–4.2(–5.9) mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume linear; (2.7–)2.9–4.5(–4.9) mm long; 1.8–2.2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acuminate.
FLORETS Fertile lemma elliptic; (1.2–)1.6–2(–2.2) mm long; membranous; keeled; 3 -veined. Lemma midvein ciliate. Lemma margins ciliate. Lemma apex dentate; 2 -fid; muticous, or mucronate, or awned; 1 -awned. Principal lemma awn subapical; 0–2 mm long overall. Palea 1 length of lemma. Apical sterile florets 1–2 in number; barren; rudimentary. Apical sterile lemmas awned; 1 -awned. Apical sterile lemma awns 0.5–1.5 mm long.
FLOWER Anthers 3; 0.5–0.7 mm long.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION North America: southeast USA.
NOTES Cynodonteae. Smith.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
