Calamagrostis arenaria (L.) Roth

First published in Tent. Fl. Germ. 1: 34 (1788)
This species is accepted
The native range of this species is Canary Islands, Europe to Medit. It is a perennial or rhizomatous geophyte and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Rhizomes elongated. Culms erect, or geniculately ascending; 50-120 cm long. Ligule an eciliate membrane; 10-30 mm long. Leaf-blades convolute; 20-60 cm long; 2-6 mm wide; stiff. Leaf-blade surface ribbed; pubescent; hairy adaxially. Leaf-blade apex pungent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle spiciform; linear, or oblong; tapering above; 7-22 cm long; 1-2.5 cm wide. Primary panicle branches appressed. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1-4 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 10-16 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.25-0.33 length of lemma (3-5mm).
Fertile
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 10-16 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.25-0.33 length of lemma (3-5mm).
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 10-15 mm long; 0.9-1 length of upper glume; chartaceous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute. Upper glume lanceolate; 10-16 mm long; 1.2-1.3 length of adjacent fertile lemma; chartaceous; 1-keeled; 3 -veined. Upper glume surface asperulous. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 8-12 mm long; coriaceous; keeled; 5-7 -veined. Lemma surface asperulous. Lemma apex dentate; 2 -fid; mucronate. Principal lemma awn subapical. Palea 0.9 length of lemma; 2-4 -veined. Palea keels approximate; scaberulous; adorned above.
Morphology Reproductive morphology Flowers
Anthers 3; 4-7 mm long. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; obovoid. Hilum linear; 0.8 length of caryopsis.
Distribution
Europe: northern, central, southwestern, southeastern, and eastern. Africa: north and south. Asia-temperate: western Asia and Arabia. Australasia: Australia and New Zealand. Pacific: southwestern and north-central. North America: western Canada, northwest USA, and southwest USA. South America: southern South America. Antarctic: Subantarctic islands.
Reference
Aveneae. CEH.
[GB]

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 2024. 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 Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. 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