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Comastoma (Wettst.) Toyok. Search in The Plant ListSearch in IPNISearch in Australian Plant Name IndexSearch in Index Nominum Genericorum (ING)Search in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Botanical Magazine 74(874): 198. 1961. (Bot. Mag. (Tokyo)) Name publication detail
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Contributor Text: SAOOD OMER
Contributor Institution: Department of Botany, University of Karachi, Karachi-75270
General/Distribution: A genus of c. 25 species, distributed in the colder or alpine regions of Asia, Europe and America. Represented in Pakistan by 5 species.
Comment/Acknowledgements: Comastoma Toyokuni posseses fimbriate corolla throat, with sessile gynoecium and stigma. The fimbriae in the genus are fairly uniform and are arranged in a definate pattern. The genus is fairly close to Gentianella Moench (s.str.), but differs on the basis of arrangement of fimbriae, and the absrnce of gynophore. It is often regarded as congeneric with Gentianella Moench (s.l.).

 

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Biennial-perennial, glabrous, erect herbs. Basal leaves in a rosette, cauline leaves opposite, loosely arranged. Inflorescence solitary, terminal. Flowers pedunculate, peduncle long, tetramerous, rarely pentamerous, bisexual, actinomorphic-zygomorphic, mostly campanulate-tubular. Calyx divided mostly up to the base, sometimes not forming a tube, not provided by an inner membrane. Corolla campanulate, sometimes tubular, variously coloured: blue, purple, violet, red, pink or white, plicae or subsidiary lobes of the corolla absent, throat fimbriate, fimbriae linear-lanceolate or filiform, entire, acute or obtuse, arising from a crown inserted near the corolla tube. Stamens corresponding to the number of and alternating with the petals. Anthers strictly versatile, with filaments running down approximately to the base of the tube. Nectaries present at the base of the corolla, two each on a petal lobe. Ovary superior, unilocular with numerous ovules and parietal placentation, sessile, stigmas 2, sessile or stipitate, capsule dehiscing septici-daily from apex. Seeds light to dark brown, ovoid or circular in shape, mostly smooth, rarely reticulate.
 

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1 Calyx and corolla tetramerous
+ Calyx and corolla pentamerous (2)
2 (1) Corolla lobes acute. Veins on calyx parallel 2 Comastoma pulmonarium
+ Corolla lobes obtuse. Veins on calyx not parallel (3)
3 (2) Veins on calyx lobes numerous and very finely reticulated
+ Veins on calyx lobes few and not finely reticulated (4)
4 (3) Stem branched, from middle or above. Calyx emarginate or unrimmed 3 Comastoma pseudopulmonarium
+ Stem short and branched from base. Calyx marginate or rimmed 1 Comastoma falcatum
 
 
 
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