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Calystegia purpurata subsp. saxicola

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 purpurataView Description 

Habit: Perennial herb from woody caudex, glabrous, often glaucous. Stem: trailing to strongly climbing, < 7 m. Leaf: blade generally 1.5--5 cm, triangular to reniform; lobes spreading, 2(3)-tipped; sinus V-shaped or +- closed. Inflorescence: peduncle 1--5-flowered, generally >> subtending leaf; bracts generally not hiding calyx, 2--16 mm, 0.4--1.5 mm wide, generally linear. Flower: sepals 7--14 mm; corolla 23--52 mm, white or cream to purple (often +- purple-striped).
Note: Subspecies intergrade.

Calystegia purpurata subsp. saxicola (Eastw.) Brummitt
Stem: trailing to weakly climbing, generally < 1 m. Leaf: ovate-triangular to reniform; sinus generally +- closed; tip generally rounded to notched; lobes rounded; margin +- wavy. Inflorescence: bracts often +- alternate, generally lobed +- like leaves.
Ecology: Rocky coastal scrub; Elevation: < 100 m. Bioregional Distribution: c&s NCo, n CCo (Brooks Island, Contra Costa Co.), n SnFrB. Flowering Time: May--Jun
Synonyms: Convolvulus occidentalis A. Gray var. saxicola (Eastw.) J.T. Howell
eFlora Treatment Author: R.K. Brummitt
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

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botanical illustration including Calystegia purpurata subsp. saxicola


Citation for this treatment: R.K. Brummitt 2017. Calystegia purpurata subsp. saxicola, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 18, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora,, accessed on October 18, 2017.

Calystegia purpurata subsp. saxicola
click for enlargement
© 2009 Vernon Smith
Calystegia purpurata subsp. saxicola
click for enlargement
© 2005 George W. Hartwell
Calystegia purpurata subsp. saxicola
click for enlargement
© 2017 Vernon Smith
Calystegia purpurata subsp. saxicola
click for enlargement
© 2005 George W. Hartwell

More photos of Calystegia purpurata subsp. saxicola in CalPhotos

Geographic subdivisions for Calystegia purpurata subsp. saxicola:
c&s NCo, n CCo (Brooks Island, Contra Costa Co.), n SnFrB.
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.