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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.
Anthoxanthum davidsei
HABIT Perennial; culms solitary. Rhizomes elongated. Culms erect; 30–60 cm long; 2–3 mm diam. Culm-internodes hollow; distally glabrous. Lateral branches lacking. Leaves 5–7 per branch. Leaf-sheaths ribbed; glabrous on surface, or pilose; with reflexed hairs. Ligule an eciliate membrane; 1.5–5 mm long; pubescent on abaxial surface; truncate. Leaf-blades 6–15 cm long; 5–8 mm wide; aromatic. Leaf-blade surface pilose; hairy adaxially.
INFLORESCENCE Inflorescence a panicle. Peduncle 10–15 cm long; glabrous.
Panicle spiciform; linear; continuous, or interrupted; 3–11 cm long.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–3 mm long; pubescent.
FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; 5.5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret.
GLUMES Glumes persistent; dissimilar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 4–4.5 mm long; 0.7–0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 5.5–6.5 mm long; 1.8–2.2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
FLORETS Basal sterile florets dissimilar; barren; without significant palea; attached to and deciduous with the fertile. Lemma of lower sterile floret lanceolate, or oblong; 5 mm long; membranous; without keels; 5 -veined; ciliate on margins; dentate; 2 -fid; obtuse; mucronate, or awned. Awn of lower sterile floret dorsal; arising 0.65–0.85 way up back of lemma; 1 mm long. Lemma of upper sterile floret oblong; 5 mm long; membranous; ciliate on margins; dentate; 2 -fid; obtuse; awned. Awn of upper sterile floret dorsal; arising 0.5 way up back of lemma; geniculate; 4–5.5 mm long. Fertile lemma oblong; 3 mm long; cartilaginous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma margins convolute; covering most of palea. Lemma apex emarginate; muticous, or mucronate. Palea oblong; 3 mm long; 1 length of lemma; 1 -veined; without keels.
FLOWER Lodicules absent. Anthers 2; 1.5 mm long; yellow. Stigmas 2; protogynous; pubescent.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform.
DISTRIBUTION South America: Mesoamericana.
NOTES Aveneae. Fl Costa Rica 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
