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Comastoma tenellum

Higher Taxonomy
Family: GentianaceaeView DescriptionDichotomous Key

Habit: Annual to perennial herb [to trees]. Stem: decumbent to erect, < 2 m, simple or branched. Leaf: simple, cauline, sometimes also basal, opposite or whorled, entire, sessile or basal +- petioled; stipules 0. Flower: bisexual, radial, parts in 4s or 5s except pistil 1; sepals fused, persistent; petals fused, +- persistent, sinus between lobes often unappendaged; stamens epipetalous, alternate corolla lobes; ovary superior, chamber 1, placentas parietal, often intruding, stigmas 1--2. Fruit: capsule, 2-valved. Seed: many.
Genera In Family: +- 90 genera, 1800 species: worldwide; some cultivated (Eustoma, Exacum, Gentiana). Note: Gentianella tenella moved to Comastoma. Key to genera revised by Bruce G. Baldwin.
eFlora Treatment Author: James S. Pringle, except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: ComastomaView Description 

Habit: Annual, glabrous. Leaf: basal, cauline, opposite. Inflorescence: flowers 1, terminal on branches; pedicels >> subtending internode. Flower: parts generally in 4s; calyx tube << lobes; corolla < 2 cm, narrowly funnel-shaped, lobes spreading, < tube, +- entire, with 2 fringed scales on adaxial surface near base, nectary pits 0 (nectaries on lower corolla tube); ovary sessile, style +- 0, stigmas 2, persistent.
Species In Genus: +- 17 species: temperate to arctic, alpine North America, Eurasia. Etymology: (Greek: hair, mouth, from fringes on corolla lobes)

Comastoma tenellum (Rottb.) Toyok.
Habit: Plant < 15(25) cm. Stem: decumbent to erect, 1--25, simple or branched near base. Leaf: generally basal, < 20 mm, elliptic-oblong to spoon-shaped; cauline 1--4 pairs, smaller. Inflorescence: pedicels 2--10 cm. Flower: calyx 4--11 mm, lobes ovate to lanceolate; corolla 6--17 mm, pale violet-blue to white, lobes 2--4.5 mm, ovate-oblong. Chromosomes: 2n=10.
Ecology: Open, wet places; Elevation: 3200--3900 m. Bioregional Distribution: c&s SNH, W&I; Distribution Outside California: to Alaska, Colorado; circumpolar. Flowering Time: Jul--Aug
Synonyms: Gentiana tenella Rottb.; Gentianella tenella (Rottb.) Börner; Gentianella tenella subsp. tenella; Gentianella tenella var. tenella; Comastoma tenellum (Rottb.) Toyok. var. tenellum;
eFlora Treatment Author: James S. Pringle
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botanical illustration including Comastoma tenellum


Citation for this treatment: James S. Pringle 2012, Comastoma tenellum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on September 24, 2018.

Citation for the whole project: Jepson Flora Project (eds.) 2018, Jepson eFlora,, accessed on September 24, 2018.

Comastoma tenellum
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© 2009 Steve Matson
Comastoma tenellum
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© 2017 Neal Kramer
Comastoma tenellum
click for enlargement
© 2009 Steve Matson
Comastoma tenellum
click for enlargement
© 2009 Steve Matson
Comastoma tenellum
click for enlargement
© 2009 Steve Matson
Comastoma tenellum
click for enlargement
© 2009 Steve Matson

More photos of Comastoma tenellum in CalPhotos

Geographic subdivisions for Comastoma tenellum:
c&s SNH, W&I;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.