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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Anthoxanthum pusillum

HABIT Perennial. Rhizomes elongated. Culms 5–10 cm long. Leaf-sheaths inflated; pubescent. Ligule an eciliate membrane; erose; truncate. Leaf-blades curved; flat, or conduplicate; 1–3 cm long; 2–3 mm wide. Leaf-blade surface puberulous; hairy adaxially.

INFLORESCENCE Inflorescence a panicle. Peduncle pubescent above.

Panicle spiciform; oblong; 1–2 cm long; 0.7–1 cm wide; bearing few spikelets. Panicle axis smooth.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent; hairy at tip.

FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; 4.5–5 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 4.5–5 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein extending to apex. Lower glume apex obtuse. Upper glume ovate; 4.5–5 mm long; membranous; 1-keeled; 3 -veined. Upper glume lateral veins all falling short of apex. 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; 5 mm long; chartaceous; 1-keeled; 5 -veined; scaberulous; rough above; truncate, or obtuse; muticous. Palea of lower sterile floret 3.5 mm long. Lemma of upper sterile floret oblong; 1 length of lower sterile floret; chartaceous; scabrous; truncate, or obtuse; muticous. Fertile florets female. Fertile lemma ovate; 3–3.5 mm long; cartilaginous; light brown; without keel; 5 -veined. Lemma margins convolute; covering most of palea. Lemma apex acute. Palea linear; 1 -veined; without keels.

FLOWER Anthers 3; 2.5 mm long. Staminodes two present. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Fl Pat 1995.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.