Dichanthelium dichotomum (L.) Gould

First published in Brittonia 26: 59 (1974)
This species is accepted
The native range of this species is SE. Canada to Nicaragua. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Rootstock evident. Culms slender; 20-80(-100) cm long. Culm-nodes glabrous, or bearded. Lateral branches fastigiate. Leaves basal and cauline; heterophyllous with a basal winter rosette. Leaf-sheaths outer margin hairy. Ligule an eciliate membrane, or a fringe of hairs; 0.2-1 mm long. Leaf-blades 4-12(-15) cm long; 3-10(-13) mm wide. Leaf-blade surface glabrous, or pilose. Leaf-blade margins glabrous, or ciliate; hairy at base. Leaf-blade apex attenuate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; oblong; 3-8(-10) cm long. Primary panicle branches spreading. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or obovate; dorsally compressed; 1.5-2.4 mm long; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or obovate; dorsally compressed; 1.5-2.4 mm long; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.25-0.33 length of spikelet; membranous; without keels; 3 -veined. Lower glume apex obtuse. Upper glume oblong; 0.7-0.8 length of spikelet; membranous; without keels; 7-9 -veined. Upper glume surface glabrous, or puberulous. Upper glume apex obtuse.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; oblong; 1 length of spikelet; membranous; 7-9 -veined; glabrous, or puberulous; obtuse. Fertile lemma oblong; dorsally compressed; 1.5-2.4 mm long; indurate; pallid; without keel. Lemma margins involute. Lemma apex obtuse. Palea involute; indurate.
Distribution
North America: eastern Canada, north-central USA, northeast USA, south-central USA, southeast USA, and Mexico. South America: Mesoamericana and Caribbean.
Reference
Paniceae. Gould.
[GB]

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/179376/1576703

Conservation
EN - endangered
[IUCN]

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
  • 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
  • Kew Science Photographs

    • Copyright applied to individual images