Deschampsia pusilla Petrie

First published in Trans. & Proc. New Zealand Inst. 23: 403 (1890 publ. 1891)
This species is accepted
The native range of this species is New Zealand South Island. It is a perennial or subshrub and grows primarily in the subalpine or subarctic biome.

Descriptions

Morphology General Habit
Perennial; caespitose; clumped densely. Culms 2-5 cm long. Ligule an eciliate membrane; acute. Leaf-blades curved; filiform; convolute; 1-2 cm long; 0.5 mm wide.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted, or spiciform; lanceolate, or oblong; 1 cm long. Primary panicle branches bearing 1-3 fertile spikelets on each lower branch. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; glabrous. Floret callus glabrous, or pubescent.
Fertile
Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; glabrous. Floret callus glabrous, or pubescent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; reaching apex of florets; similar to fertile lemma in texture; shiny. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume elliptic; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 2-2.5 mm long; membranous; shiny; without keel; 5 -veined. Lemma apex erose, or dentate; 4 -fid; mucronate. Principal lemma awn (mucro) subapical. Rhachilla extension glabrous.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum punctiform.
Distribution
Australasia: New Zealand.
Reference
Aveneae. Cheeseman 1995.
[GB]

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: threatened. Confidence: low confidence
[AERP]

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