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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.
± 90 genera, 1800 species: worldwide; some cultivated (Eustoma, Exacum, Gentiana). [Struwe & Albert 2002 Gentianaceae. Cambridge Univ Press] Gentianella tenella moved to Comastoma. Key to genera revised by Bruce G. Baldwin. —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Wood & Weaver 1982 J Arnold Arbor 63:441–487; Struwe & Albert 2002 Gentianaceae: Systematics and Natural History. Cambridge Univ Press]
Key to Gentianaceae
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.
± 17 species: temperate to arctic, alpine North America, Eurasia. (Greek: hair, mouth, from fringes on corolla lobes)
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.
2n=10. Open, wet places; 3200–3900 m. c&s High Sierra Nevada, White and Inyo Mountains; to Alaska, Colorado; circumpolar. [Gentiana tenella Rottb.; Gentianella tenella (Rottb.) Börner; Gentianella tenella subsp. tenella; Gentianella tenella var. tenella; Comastoma tenellum (Rottb.) Toyok. var. tenellum] Jul–Aug [Online Interchange]
Previous taxon: Comastoma
Next taxon: Eustoma
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Nov 28 2015
Citation for this treatment: [Author of taxon treatment] 2013. Comastoma, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=20070, accessed on Nov 28 2015
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|Geographic subdivisions indicated for the distribution of Comastoma tenellum|| Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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(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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