GrassBase - The Online World Grass Flora


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

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

Anthoxanthum arcticum

HABIT Perennial. Rhizomes elongated. Culms erect; 15–30 cm long. Culm-internodes smooth, or scaberulous. Leaves mostly basal; much reduced on the culm. Leaf-sheaths scaberulous. Ligule an eciliate membrane; 0.5–1 mm long. Leaf-blades 10–20 cm long; 1–2 mm wide; aromatic. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; 1.5–3 cm long; bearing few spikelets. Primary panicle branches appressed; bearing 1–2 fertile spikelets on each lower branch.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; 4–5 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma; shiny. Lower glume ovate; 2.5 mm long; 0.75 length of upper glume; hyaline; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 3.5–4.5 mm long; 0.9 length of adjacent fertile lemma; hyaline; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Basal sterile florets similar; male; with palea; attached to and deciduous with the fertile. Lemma of lower sterile floret elliptic; 1 length of fertile lemma; membranous; 1-keeled; 5 -veined; scabrous; entire; acute; muticous, or mucronate. Lemma of upper sterile floret oblong; 1 length of lower sterile floret; membranous; scabrous; entire; acute; muticous, or mucronate. Fertile lemma ovate; 4–5 mm long; cartilaginous; without keel. Lemma surface scabrous; rough above. Lemma margins convolute; covering most of palea. Lemma apex acute. Palea elliptic; 3 -veined; without keels.

FLOWER Anthers 2 (bisexual), or 3 (male). Ovary glabrous.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Europe: eastern. Asia-temperate: Siberia and Soviet far east. North America: Subarctic, western Canada, and eastern Canada.

NOTES Aveneae. N Amer Fl 1994.

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