Poaceae
Deschampsia

Deschampsia wacei C.E.Hubb.

First published in Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 392 (1981)
This species is accepted
The native range of this species is Tristan da Cunha. It is a perennial and grows primarily in the temperate biome.

Descriptions

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/43904/10835539

Conservation
DD - data deficient
[IUCN]

Morphology General Habit
Perennial; caespitose; clumped densely. Butt sheaths coriaceous; glossy; persistent and investing base of culm. Culms erect; 6-40 cm long; 1-2 -noded. Culm-internodes smooth. Lateral branches lacking. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 2-10 mm long; acute. Leaf-blades curved; filiform; involute; 1-12 cm long; 0.6-1.3 mm wide; stiff. Leaf-blade surface ribbed; grooved adaxially; smooth; glabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; lanceolate, or oblong; 2.5-15 cm long. Primary panicle branches 1-3 cm long. Panicle axis smooth; glabrous. Panicle branches smooth. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1-4 mm long; smooth.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 9-10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite. Floret callus pilose. Floret callus hairs 1-2 mm long.
Fertile
Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 9-10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite. Floret callus pilose. Floret callus hairs 1-2 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; shiny; gaping. Lower glume lanceolate, or elliptic; 9-10 mm long; membranous; 1-keeled; 1-3 -veined. Lower glume primary vein smooth. Lower glume lateral veins absent, or obscure. Lower glume apex acute. Upper glume lanceolate, or oblong; 9-10 mm long; membranous; 1-keeled; 1-3 -veined. Upper glume primary vein smooth. Upper glume lateral veins absent, or distinct. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong, or ovate; 5-6 mm long; membranous; shiny; without keel; 7 -veined. Lemma surface asperulous; rough above. Lemma apex dentate; 2 -fid; with lateral lobes bidentate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; straight; 5-10 mm long overall. Palea oblong; 1 length of lemma; 2 -veined. Palea keels scaberulous. Palea apex dentate; 2 -fid. Rhachilla extension pilose.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 1.2-1.4 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
Antarctic: Subantarctic islands.
Reference
Aveneae. Hubbard 1999.
[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/

  • IUCN Categories

    • IUCN Red List of Threatened Species
    • http://creativecommons.org/licenses/by-nc-sa/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