Poaceae
Isachne

Isachne hoi Keng f.

First published in Acta Phytotax. Sin. 10: 11 (1965)
This species is accepted
The native range of this species is China (Guangdong, Hunan, Zhejiang). It is a perennial and grows primarily in the subtropical biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Butt sheaths glabrous, or pilose. Culms decumbent; 45-85 cm long; rooting from lower nodes. Culm-internodes 3-15 cm long; distally glabrous. Culm-nodes glabrous. Lateral branches lacking, or sparse. Leaf-sheaths 2-7 cm long; mostly shorter than adjacent culm internode; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs; 2 mm long. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 4.5-13.5 cm long; 8-18 mm wide. Leaf-blade midrib indistinct. Leaf-blade surface scabrous; pubescent; hairy on both sides; with tubercle-based hairs. Leaf-blade margins cartilaginous. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; terminal, or terminal and axillary. Panicle open; ovate; effuse; 10-20 cm long; 10-15 cm wide. Primary panicle branches 1 -nate; 8-10 cm long. Panicle axis glandular; scaberulous. Panicle branches straight, or flexuous; glandular; scaberulous. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2 mm long; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2 mm long; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 2 mm long; 1.1-1.3 length of spikelet; herbaceous; much thinner on margins; mid-green and purple; without keels; 7-9 -veined. Lower glume surface pubescent; hairy above. Lower glume apex obtuse. Upper glume ovate; 2 mm long; 1.1-1.3 length of spikelet; herbaceous; with hyaline margins; mid-green and purple; without keels; 7-9 -veined. Upper glume surface pubescent; hairy above. Upper glume apex obtuse.
Morphology Reproductive morphology Flowers Florets
Fertile florets alike but female above. Fertile lemma orbicular; 1.5-1.8 mm long; cartilaginous; light brown; without keel. Lemma surface puberulous. Lemma margins involute. Lemma apex obtuse. Palea cartilaginous.
Morphology Reproductive morphology Flowers
Anthers 3; 1 mm long; brown.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ellipsoid, or orbicular; laterally compressed; 1.2 mm long; dark brown.
Distribution
Asia-temperate: China.
Reference
Isachneae. Keng 1996.
[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: confident
[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

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. 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 2026. 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