Helictochloa hookeri (Scribn.) Romero Zarco

First published in Candollea 66: 102 (2011)
This species is accepted
The native range of this species is E. Europe to Mongolia and Central Asia, Subarctic America to N. & W. Central U.S.A. It is a perennial and grows primarily in the subalpine or subarctic biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial; caespitose. Culms erect; 30-40 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1-3 mm long; lacerate. Leaf-blades flat, or conduplicate; 2-4 mm wide. Leaf-blade surface scaberulous; glabrous. Leaf-blade margins cartilaginous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; linear, or lanceolate; 5-10 cm long. Primary panicle branches appressed; bearing 1-2 fertile spikelets on each lower branch. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 4-6 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose. Floret callus pubescent.
Fertile
Spikelets comprising 4-6 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose. Floret callus pubescent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume elliptic; 12 mm long; 0.8-0.9 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume apex acute. Upper glume elliptic; 14 mm long; 1-1.4 length of adjacent fertile lemma; membranous; 1-keeled; 5 -veined. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma elliptic; 10-13 mm long; cartilaginous; without keel; 5-7 -veined. Lemma surface scaberulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; 10-15 mm long overall; with twisted column.
Morphology Reproductive morphology Flowers
Lodicules 2; 2 mm long. Anthers 3; 4-5 mm long. Ovary pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; hairy at apex. Hilum linear.
Distribution
Europe: eastern. Asia-temperate: Siberia, Soviet far east, Soviet Middle Asia, China, and Mongolia. North America: Subarctic, western Canada, eastern Canada, northwest USA, north-central USA, and south-central USA.
Reference
Aveneae. Fl Pac NW 1994.
[GB]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0
  • 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