Leymus arenarius (L.) Hochst.

First published in Flora 31: 118 (1848)
This species is accepted
The native range of this species is Europe. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Rhizomes elongated. Culms erect, or geniculately ascending; 60-200 cm long. Leaves cauline. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs lacking. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 0.3-1 mm long; truncate. Leaf-blades flat, or involute; 20-60 cm long; 8-22 mm wide; stiff; glaucous. Leaf-blade surface ribbed; scaberulous; rough adaxially. Leaf-blade apex acuminate; hardened.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 1; single; erect; bilateral; 15-35 cm long. Rhachis flattened; scabrous on margins. Spikelet packing broadside to rhachis; regular; 2 -rowed. Spikelets appressed; in pairs. Fertile spikelets sessile; 2 in the cluster.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 3-6 fertile florets; with diminished florets at the apex. Spikelets oblong, or cuneate; laterally compressed; 20-32 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus glabrous; base truncate. Rhachilla internodes definite; obscured by lemmas; pubescent.
Fertile
Spikelets comprising 3-6 fertile florets; with diminished florets at the apex. Spikelets oblong, or cuneate; laterally compressed; 20-32 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus glabrous; base truncate. Rhachilla internodes definite; obscured by lemmas; pubescent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; subequal in width; reaching apex of florets, or shorter than spikelet. Lower glume lanceolate; 18-30 mm long; 1 length of upper glume; coriaceous; 1-keeled; 3-5 -veined. Lower glume surface pubescent. Lower glume apex attenuate. Upper glume lanceolate; 18-30 mm long; 1.2 length of adjacent fertile lemma; coriaceous; 1-keeled; 3-5 -veined. Upper glume surface pubescent. Upper glume apex attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 15-25 mm long; coriaceous; keeled; keeled above; 7 -veined. Lemma surface pubescent. Lemma apex acute. Palea lanceolate; 1 length of lemma; 2 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; elliptic; membranous. Anthers 3; 7-8 mm long. Stigmas 2; protandrous; laterally exserted. Ovary pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform; isodiametric; estipitate; without sulcus; 10 mm long; smooth; apex unappendaged. Embryo 0.2 length of caryopsis. Hilum linear; 0.9 length of caryopsis. Endosperm farinose.
Distribution
Europe: northern, central, southwestern, and eastern. Australasia: Australia and New Zealand. North America: Subarctic, western Canada, eastern Canada, and northwest USA. South America: southern South America. Antarctic: Subantarctic islands.
Reference
Triticeae. CEH.
[GB]

Common Names

English
Lyme Grass

Sources

  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora.
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Herbarium Catalogue Specimens

    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/
  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Living Collection Database

    • Common Names from Plants and People Africa http://www.plantsandpeopleafrica.com/
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Science Photographs

    • Copyright applied to individual images