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.

Arctagrostis

HABIT Perennial. Rhizomes elongated. Culms 15–120 cm long. Ligule an eciliate membrane.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets elliptic; laterally compressed; 2.5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.75 length of upper glume; hyaline; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface without pits. Lower glume apex acute. Upper glume ovate; 0.75 length of adjacent fertile lemma; hyaline; 1-keeled; 1 -veined. Upper glume apex acute.

FLORETS Fertile lemma oblong; membranous; much thinner above; keeled; wingless; 3 -veined. Lemma lateral veins obscure; less than two thirds length of lemma. Lemma surface scaberulous; unwrinkled; without grooves. Lemma apex obtuse. Palea 1 length of lemma; 2 -veined. Palea keels scaberulous.

FLOWER Anthers 3. Ovary glabrous.

DISTRIBUTION Europe, or Temperate Asia, or North America.

Please cite this publication as detailed in How to Cite Version: 27th January 2014.