Chusquea arachniformis L.G.Clark & Londoño

First published in Novon 8: 425 (1998)
This species is accepted
The native range of this species is N. Central Colombia. It is a bamboo and grows primarily in the wet tropical biome.

Descriptions

Morphology General Habit
Perennial. Culms scandent; pendulous at the tip; 200-300 cm long; 3-5 mm diam.; woody; without nodal roots. Culm-internodes terete; 20-28 cm long; distally glabrous. Culm-nodes with distinct supra-nodal ridge. Lateral branches dendroid; infravaginal. Branch complement many; in a clump; thinner than stem. Culm-sheaths persistent; 9-26.5 cm long; retrorsely scabrous; pubescent; hairy above; hairy on margins. Culm-sheath ligule 0.5 mm high. Culm-sheath blade lanceolate; indistinctly demarcated from sheath; erect; 0.3-28 cm long; pubescent. Leaves 3-6 per branch. Leaf-sheaths keeled (above); striately veined; glabrous on surface; outer margin hairy. Ligule an eciliate membrane; 1.5-3.5 mm long. Collar with external ligule. Leaf-blade base asymmetrical; with a brief petiole-like connection to sheath; petiole 0.3-0.4 cm long. Leaf-blades lanceolate, or ovate; 9-14 cm long; 16-25 mm wide. Leaf-blade venation without cross veins. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; bracteate at branch bases (1.5-2mm); subtended by an inflated leaf-sheath. Panicle capitate; linear; continuous, or interrupted; 2-4 cm long; 1.5 cm wide. Panicle axis angular; pubescent. Panicle branches angular; pubescent. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 10.5-11.5 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 oblong; laterally compressed; 10.5-11.5 mm long; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 3.5-4 mm long; membranous; 1-keeled; 3 -veined. Lower glume surface puberulous. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 8.5-16 mm long. Upper glume lanceolate; 4-4.5 mm long; 0.33 length of adjacent fertile lemma; membranous; 1-keeled; 5 -veined. Upper glume surface puberulous. Upper glume apex obtuse; awned; 1 -awned. Upper glume awn 2.4-4 mm long.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea; attached to and deciduous with the fertile. Lemma of lower sterile floret lanceolate; 9-11.7 mm long; 0.9 length of fertile lemma; chartaceous; 9 -veined; puberulous; hairy above; acute; awned. Awn of lower sterile floret 2.4-4 mm long. Lemma of upper sterile floret lanceolate; 10.9-13 mm long; chartaceous; pubescent; obtuse. Fertile lemma ovate; 9.8-10.7 mm long; coriaceous; without keel; rounded except near apex; 7 -veined. Lemma surface pilose; hairy above. Lemma apex acute. Palea 8.6-9.8 mm long; 4 -veined.
Morphology Reproductive morphology Flowers
Lodicules 3; 1.5-2.5 mm long; membranous; ciliate. Anthers 3; 6 mm long. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; apex unappendaged.
Distribution
South America: western South America.
Reference
Bambuseae. Londono 2001.
[GB]

Distribution
Biogeografic region: Andean. Elevation range: 1650–1900 m a.s.l. Endemic to Colombia. Colombian departments: Antioquia.
Habit
Climbing.
[UPFC]

Bernal, R., Gradstein, S.R. & Celis, M. (eds.). 2015. Catálogo de plantas y líquenes de Colombia. Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá. http://catalogoplantasdecolombia.unal.edu.co

Distribution
Endémica y nativa en Colombia; Alt. 1650 - 1900 m.; Andes.
Morphology General Habit
Trepadora
Conservation
No Evaluada
[CPLC]

Sources

  • Catálogo de Plantas y Líquenes de Colombia

    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • 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
  • Useful Plants and Fungi of Colombia

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