Dichanthelium laxiflorum (Lam.) Gould

First published in Brittonia 26: 60 (1974)
This species is accepted
The native range of this species is Central & E. U.S.A. to Central America, Cuba to Hispaniola. It is a perennial and grows primarily in the temperate biome.

Descriptions

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: confident
[AERP]

Morphology General Habit
Perennial; mat forming. Culms 15-40 cm long. Culm-internodes distally glabrous. Culm-nodes bearded. Lateral branches lacking. Leaves heterophyllous with a basal winter rosette. Leaf-sheaths glabrous on surface, or hirsute; with simple hairs, or reflexed hairs; outer margin hairy. Ligule an eciliate membrane, or a ciliolate membrane. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 7-16 cm long; 3-10 mm wide; yellowish green. Leaf-blade surface glabrous, or pubescent; sparsely hairy. Leaf-blade margins ciliate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; pyramidal; loose; 7-12 cm long; bearing few spikelets. Panicle axis hirsute. Panicle branches hirsute. Spikelets spreading; solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate; dorsally compressed; obtuse; 1.7-2.3 mm long; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate; dorsally compressed; obtuse; 1.7-2.3 mm long; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.5 mm long; 0.25-0.33 length of spikelet; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 1.7-2.3 mm long; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface pubescent. Upper glume apex obtuse.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1.7-2.3 mm long; 1 length of spikelet; membranous; 5 -veined; pubescent; obtuse. Fertile lemma elliptic; dorsally compressed; 1.5-2 mm long; indurate; shiny; without keel. Lemma margins involute. Palea involute; indurate.
Morphology Reproductive morphology Flowers
Anthers 3.
Distribution
North America: northeast USA, south-central USA, southeast USA, and Mexico. South America: Mesoamericana and Caribbean.
Reference
Paniceae. Gr Texas 1997.
[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

    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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