Poaceae
Eragrostis

Eragrostis pilosiuscula Ohwi

First published in Bot. Mag. (Tokyo) 55: 279 (1941)
This species is accepted
The native range of this species is SE. China, Taiwan. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial. Culms erect; 50-90 cm long; 1 mm diam. Lateral branches lacking. Leaf-sheaths smooth; glabrous on surface. Leaf-sheath oral hairs lacking, or ciliate. Ligule a fringe of hairs; 0.2 mm long. Leaf-blades erect; flat, or involute; 7-18 cm long; 1.5-2.5 mm wide. Leaf-blade surface glabrous, or pilose; sparsely hairy; hairy adaxially.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; ovate; 12-35 cm long. Primary panicle branches ascending; 1 -nate; 4-6 cm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1-10 mm long; scaberulous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 12-60 fertile florets; with diminished florets at the apex. Spikelets linear, or oblong; laterally compressed; 5-25 mm long; 1.5-2 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas. Rhachilla internodes 0.5 mm long.
Fertile
Spikelets comprising 12-60 fertile florets; with diminished florets at the apex. Spikelets linear, or oblong; laterally compressed; 5-25 mm long; 1.5-2 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas. Rhachilla internodes 0.5 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes similar; shorter than spikelet. Lower glume ovate; 0.8-1.2 mm long; 0.66-0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute, or acuminate. Upper glume ovate; 1.2-1.5 mm long; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute, or acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 1.5-2 mm long; membranous; keeled; 3 -veined. Lemma lateral veins prominent. Lemma apex acute. Palea bowed outwards; 2 -veined. Palea keels scaberulous. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; cuneate; fleshy. Anthers 3; 0.3 mm long; purple.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; 0.6 mm long.
Distribution
Asia-temperate: China and eastern Asia.
Reference
Eragrostideae. Keng 1996.
[GB]

Morphology General Habit
Perennial; caespitose. Culms erect; slender; 40-90 cm long; 1 mm diam.; 2-3 -noded. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs. Leaf-blades involute; 3-8 cm long; 1-2.5 mm wide. Leaf-blade surface pilose.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; elliptic; loose; 7-25 cm long; 4-9 cm wide. Primary panicle branches 1 -nate; 4-8 cm long; bearing 2-5 fertile spikelets on each lower branch. Panicle branches glabrous in axils. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 5-10 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 6-60 fertile florets; with diminished florets at the apex. Spikelets linear, or oblong; laterally compressed; 5-25 mm long; 3 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas.
Fertile
Spikelets comprising 6-60 fertile florets; with diminished florets at the apex. Spikelets linear, or oblong; laterally compressed; 5-25 mm long; 3 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes similar; shorter than spikelet. Lower glume ovate; 1.2 mm long; 0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume ovate; 1.5 mm long; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate; 2 mm long; membranous; keeled; 3 -veined. Lemma midvein scabrous. Lemma lateral veins distinct. Lemma apex acute. Palea 1.8 mm long; 2 -veined. Palea keels ciliate. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Anthers 3; 0.3 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; 0.6 mm long.
Distribution
Asia-temperate: China and eastern Asia.
Reference
Eragrostideae. Fl China 2007.
[GB]

Sources

  • 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 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 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 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0