Chusquea circinata Soderstr. & C.E.Calderón

First published in Brittonia 30: 156 (1978)
This species is accepted
The native range of this species is Mexico (Sinaloa to Chiapas). It is a bamboo and grows primarily in the seasonally dry tropical biome.

Descriptions

Morphology General Habit
Perennial. Culms erect; 500-700 cm long; 10-15 mm diam.; woody; without nodal roots. Culm-internodes terete; solid; smooth. Lateral branches dendroid. Branch complement many; girdling the culm; with 1 branch dominant; thinner than stem. Culm-sheaths antrorsely scabrous. Ligule an eciliate membrane; 0.4 mm long. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades deciduous at the ligule; lanceolate; 4.5-5.5 cm long; 6-7 mm wide. Leaf-blade venation without cross veins. Leaf-blade surface pilose; sparsely hairy; hairy on both sides.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 20-40 fertile spikelets. Panicle contracted; linear; 5-9 cm long. Primary panicle branches appressed. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 6-8 mm long; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 6-8 mm long; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.2-0.4 mm long; 0.75-0.9 length of upper glume; membranous; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 0.2-0.4 mm long; 0.02-0.05 length of adjacent fertile lemma; without keels; 0 -veined. Upper glume primary vein absent. Upper glume lateral veins absent. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets similar; barren; without significant palea; attached to and deciduous with the fertile. Lemma of lower sterile floret lanceolate; 6-6.4 mm long; 0.75-0.8 length of fertile lemma; membranous; 5-7 -veined; obtuse; mucronate. Lemma of upper sterile floret lanceolate; 6.1-6.6 mm long; 1 length of lower sterile floret; membranous; obtuse; mucronate. Fertile lemma lanceolate; 6.3-7.5 mm long; coriaceous; without keel; 7 -veined. Lemma margins ciliolate; hairy above. Lemma apex acute. Palea 7 mm long; 6-8 -veined. Palea surface glabrous.
Morphology Reproductive morphology Flowers
Lodicules 3; 1.5-1.8 mm long; membranous; veined; ciliate. Anthers 3; 4.1-4.3 mm long. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; apex unappendaged.
Distribution
North America: Mexico.
Reference
Bambuseae. Sod & Cald 1995.
[GB]

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/44393191/44520505

Conservation
LC - least concern
[IUCN]

Sources

  • GrassBase - The Online World Grass Flora

    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Herbarium Catalogue Specimens

  • 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 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