Poaceae
Drepanostachyum

Drepanostachyum annulatum Stapleton

First published in Edinburgh J. Bot. 51: 305 (1994)
This species is accepted
The native range of this species is S. Bhutan. It is a bamboo and grows primarily in the subtropical biome.

Descriptions

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/83568395/84447276

Conservation
VU - vulnerable
[IUCN]

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: low confidence
[AERP]

Morphology General Habit
Perennial; caespitose; clumped densely. Rhizomes short; pachymorph. Culms pendulous at the tip; 200-300 cm long; 4-6 mm diam.; woody; without nodal roots. Culm-internodes terete; thin-walled; 10-21 cm long; dark green; distally pruinose. Culm-nodes swollen; pubescent. Lateral branches dendroid. Bud prophyll 1-keeled. Branch complement many; in a horizontal line (two lines). Culm-sheaths deciduous; 2 times as long as wide; green and purple; distinctly mottled with last colour; pubescent; hairy at the base; without auricles; ciliate on shoulders. Culm-sheath ligule entire, or ciliolate. Culm-sheath blade linear. Leaf-sheaths glabrous on surface; outer margin hairy. Leaf-sheath oral hairs ciliate; 2 mm long. Ligule an eciliate membrane; 1-3 mm long; obtuse, or acute. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole glabrous. Leaf-blades lanceolate; 8-16 cm long; 9-18 mm wide. Leaf-blade surface puberulous; hairy abaxially (on midrib).
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; without bracts, or bracteate at branch bases. Panicle open. Panicle branches arcuate; pubescent in axils; with insignificant pulvini. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2-8 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2(-3) fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 8-12 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose; hairy at tip.
Fertile
Spikelets comprising 2(-3) fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 8-12 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose; hairy at tip.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 4-7 mm long; chartaceous; without keels. Lower glume surface asperulous. Lower glume margins ciliate. Lower glume apex acute. Upper glume elliptic; 5-7.5 mm long; chartaceous; without keels. Upper glume surface scabrous. Upper glume margins ciliate. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma 7-9.5 mm long; chartaceous; without keel. Lemma surface scabrous. Lemma margins ciliolate; hairy above. Palea 8.5-10 mm long; 1.1-1.3 length of lemma; 2 -veined. Palea keels scabrous. Palea surface scabrous. Palea apex entire, or dentate; 2 -fid. Rhachilla extension 2-5 mm long. Apical sterile florets distinct from fertile; 1 in number; rudimentary.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3; 4-5 mm long; yellow; anther tip apiculate.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; apex unappendaged.
Distribution
Asia-tropical: India.
Reference
Bambuseae. Stapleton 1995.
[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

    • 'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    • 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 2025. 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 2025. 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