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Calystegia collina subsp. venusta

Higher Taxonomy
Family: ConvolvulaceaeView DescriptionDichotomous Key

Habit: Annual, perennial herb, subshrub, generally twining or trailing. Leaf: 0 or alternate. Inflorescence: cyme or flowers 1 in axils; bracts subtending flowers 0 or 2. Flower: bisexual, radial; sepals (4)5, +- free, overlapping, persistent, often unequal; corolla generally showy, generally bell-shaped, +- shallowly 5-lobed, generally pleated and twisted in bud; stamens 5, epipetalous; pistil 1, ovary superior, chambers generally 2, each generally 2-ovuled, styles 1--2. Fruit: generally capsule. Seed: 1--4(6).
Genera In Family: 55--60 genera, 1600--1700 species: warm temperate to tropics; some cultivated for food or as ornamental (Ipomoea). Note: Monophyletic only if Cuscutaceae included, as treated here. Ipomoea cairica (L.) Sweet, Ipomoea hederacea Jacq. [Ipomoea nil L., misappl.], Ipomoea indica (Burm.) Merr. (including Ipomoea mutabilis Ker Gawl.), Ipomoea purpurea (L.) Roth, Ipomoea triloba L., all included in TJM (1993), not naturalized.
eFlora Treatment Author: Robert E. Preston, except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: CalystegiaView DescriptionDichotomous Key

Habit: Perennial herb, subshrub from caudex or rhizome, glabrous to tomentose. Stem: short to high-climbing, generally twisting, twining. Leaf: generally > 1 cm, linear to reniform or sagittate to hastate (deeply divided). Inflorescence: peduncle generally 1-flowered; bracts generally +- opposite, lobed or not, > 1 mm below calyx, not hiding it, small, to < 1 mm below calyx, hiding it or +- so, large. Flower: generally showy; corolla glabrous, white or yellow to pink or purple; ovary chamber 1, style 1, stigma lobes 2, oblong, tips obtuse. Fruit: +- spheric, +- inflated. Seed: generally +- 4.
Species In Genus: +- 25 species: temperate, worldwide. Etymology: (Greek: hiding calyx, by bracts of some) Note: Intermediates common, often difficult to identify. Molecular evidence indicates close relationship with Convolvulus (Carine et al. 2004 Amer J Bot 91:1070--1085). Bracts qualify as bractlets by some definitions. Leaf blade length measured along midrib.
eFlora Treatment Author: R.K. Brummitt
Species: Calystegia collinaView Description 

Habit: Perennial herb from rhizome, tomentose. Stem: decumbent, not or weakly climbing. Leaf: generally < 3 cm, reniform (basal lobes indistinct) to distinctly lobed; margin generally wavy. Inflorescence: peduncle < 6 cm, > subtending leaf or not; bracts partly to entirely hiding calyx, entire. Flower: sepals 8--13 mm; corolla 25--55 mm, white.

Calystegia collina subsp. venusta Brummitt
Habit: Plant densely spreading-hairy or tomentose. Stem: 8--30 cm. Leaf: +- triangular to +- reniform; lobes distinct or not. Inflorescence: bracts spreading, not hiding calyx, 8--16 mm, 4--10 mm wide, lanceolate to widely ovate, +- flat. Flower: sepals finely tomentose; corolla 25--44 mm.
Ecology: Open grassy or rocky places or in open oak/pine woodland, often serpentine; Elevation: < 600 m. Bioregional Distribution: SCoR. Flowering Time: Apr--Jun Note: Intergrades with Calystegia subacaulis subsp. episcopalis, Calystegia malacophylla subsp. pedicellata.
eFlora Treatment Author: R.K. Brummitt
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

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Next taxon: Calystegia longipes

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botanical illustration including Calystegia collina subsp. venusta


Citation for this treatment: R.K. Brummitt 2017. Calystegia collina subsp. venusta, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 21, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora,, accessed on October 21, 2017.

Calystegia collina subsp. venusta
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© 2005 Dieter Wilken
Calystegia collina subsp. venusta
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© 2008 Keir Morse
Calystegia collina subsp. venusta
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© 2007 California Academy of Sciences
Calystegia collina subsp. venusta
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© 2008 Keir Morse
Calystegia collina subsp. venusta
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© 2015 Neal Kramer
Calystegia collina subsp. venusta
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© 2003 Keir Morse

More photos of Calystegia collina subsp. venusta in CalPhotos

Geographic subdivisions for Calystegia collina subsp. venusta:
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.
Blue line denotes eFlora flowering time.