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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 hirtum
HABIT Perennial; culms solitary, or caespitose; clumped loosely. Rhizomes elongated. Culms erect; 40–85(–110) cm long. Ligule an eciliate membrane; 2.5–5.5 mm long. Leaf-blades 18–30 cm long; 2.5–5.5 mm wide; aromatic. Leaf-blade surface pilose; hairy adaxially.
INFLORESCENCE Inflorescence a panicle; comprising 20–100 fertile spikelets.
Panicle open; pyramidal; 7.5–15 cm long; 2–10 cm wide.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 4–6.3 mm long; breaking up at maturity; disarticulating below each fertile floret.
GLUMES Glumes persistent; similar; reaching apex of florets; thinner than fertile lemma; shiny. Lower glume ovate; 4–6.3 mm long; 1 length of upper glume; membranous; 1-keeled. Lower glume apex obtuse. Upper glume ovate; 4–6.3 mm long; 1.3–1.8 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume apex obtuse.
FLORETS Basal sterile florets similar; male; with palea; attached to and deciduous with the fertile. Lemma of lower sterile floret elliptic; 3–5 mm long; 1–1.4 length of fertile lemma; membranous; 1-keeled; 5 -veined; pubescent; ciliate on margins; bearing hairs 0.5–1 mm long; emarginate; muticous, or mucronate, or awned. Awn of lower sterile floret 0.1–1 mm long. Fertile lemma ovate; 2.9–3.5 mm long; cartilaginous; shiny; without keel; 3–5 -veined. Lemma surface pubescent, or pilose; hairy above. Lemma margins convolute; covering most of palea. Lemma hairs 0.5–1 mm long. Lemma apex acute. Palea elliptic; 0.8 length of lemma; 1 -veined; without keels.
FLOWER Lodicules 2. Anthers 2 (bisexual), or 3 (male); 1.2–2.1 mm long. Stigmas sparsely hairy.
DISTRIBUTION Europe: northern, central, and eastern. North America: Subarctic, western Canada, eastern Canada, northwest USA, north-central USA, and northeast USA.
NOTES Aveneae. Fl N Amer 2007.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
