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Vascular Plants of California
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Calystegia occidentalis subsp. occidentalis

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
Reference: Brummitt 2002 Madroño 49:130--131
Unabridged Reference: Brummitt 1980 Kew Bull 35(2):327--328
Species: Calystegia occidentalisView Description 

Habit: Perennial herb from woody caudex; puberulent to finely tomentose. Stem: decumbent to strongly climbing. Leaf: blade generally 1.5--4 cm; lobes generally +- distinct, rounded to 2-tipped; sinus rounded to +- square or tapered. Inflorescence: peduncle 1--4-flowered, < to +- > subtending leaf; bracts generally +- not hiding calyx, 5--12 mm, linear to +- round, +- sessile or stalked, entire or toothed or lobed like leaves. Flower: sepals 9--15 mm; corolla 20--48 mm, white to creamy yellow.

Calystegia occidentalis (A. Gray) Brummitt subsp. occidentalis
Stem: decumbent to strongly climbing, generally > 1 m. Leaf: lobes generally indistinct, generally 2-tipped. Inflorescence: peduncle (1)2--4-flowered; bracts 1--7 mm below calyx, 4--18 mm, 1--5 mm wide, generally +- linear-oblong, entire.
Ecology: Dry slopes, chaparral, pine woodland; Elevation: < 1200 m. Bioregional Distribution: KR, NCoR, CaRH, SNH, SnFrB, MP; Distribution Outside California: Oregon. Flowering Time: May--Jul
Synonyms: Convolvulus fruticetorum Greene; Convolvulus polymorphus Greene
Unabridged Note: Intergrades with Calystegia atriplicifolia subsp. buttensis, Calystegia collina subsp. tridactylosa, Calystegia malacophylla, Calystegia occidentalis subsp. fulcrata, Calystegia peirsonii, Calystegia purpurata subsp. purpurata, Calystegia subacaulis. Evaluation under way of Calystegia occidentalis var. tomentella (Greene) Brummitt [Convolvulus tomentellus Greene] (leaves +- equilateral, bracts +- 1 mm below calyx; CaR, southern SN (Greenhorn Mountains), Teh).
Jepson eFlora Author: R.K. Brummitt
Reference: Brummitt 2002 Madroño 49:130--131
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Calystegia occidentalis subsp. occidentalis

botanical illustration including Calystegia occidentalis subsp. occidentalis


Citation for this treatment: R.K. Brummitt 2012, Calystegia occidentalis subsp. occidentalis, in Jepson Flora Project (eds.) Jepson eFlora, eflora_display.php?tid=49559, accessed on January 26, 2020.

Citation for the whole project: Jepson Flora Project (eds.) 2020, Jepson eFlora,, accessed on January 26, 2020.

Calystegia occidentalis subsp. occidentalis
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© 2015 Neal Kramer
Calystegia occidentalis subsp. occidentalis
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© 2016 Julie Kierstead Nelson
Calystegia occidentalis subsp. occidentalis
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© 2008 Keir Morse
Calystegia occidentalis subsp. occidentalis
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© 2015 Barry Breckling
Calystegia occidentalis subsp. occidentalis
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© 2006 George W. Hartwell
Calystegia occidentalis subsp. occidentalis
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© 2010 Vernon Smith

More photos of Calystegia occidentalis subsp. occidentalis in CalPhotos

Geographic subdivisions for Calystegia occidentalis subsp. occidentalis:
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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.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

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 (fruiting time in some monocot genera).