Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Lauramay T. Dempster (except Calystegia)

Perennial (annual), generally twining or trailing
Leaves alternate
Inflorescence: cyme or flowers solitary in axils; pedicels often with 2 bracts
Flower bisexual, radial; sepals 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, ovules generally 2 per chamber, styles 1–2
Fruit: generally capsule
Seeds 1–4(6)
Genera in family: 50 genera, 1,000 species: warm temp to tropical; some cultivated as ornamental
Recent taxonomic note: Recently treated to include Cuscutaceae [Angiosperm Phylogeny Group 1998 Ann Missouri Bot Gard 85:531–553].
(Family description, key to genera by L.T. Dempster)



Richard K. Brummitt

Perennial, subshrub from caudex or rhizome, glabrous to tomentose
Stem very short to high-climbing, generally twisting and twining
Leaf generally > 1 cm, linear to reniform, often sagittate to hastate, rarely deeply divided
Inflorescence: peduncle generally 1-flowered; bractlets small and remote from calyx to large and concealing calyx, sometimes lobed
Flower generally showy; corolla glabrous, white or yellow to pink or purple; ovary chamber 1 (septa generally incomplete), stigma lobes 2, generally swollen, cylindric or oblong, ± flattened
Fruit ± spheric, ± inflated
Seeds generally ± 4
Species in genus: ± 25 species: temp, worldwide
Etymology: (Greek: concealing calyx, from bractlets of some)
Reference: [Brummitt 1980 Kew Bull 35(2):327–328]
Intergradation common; intermediate forms often difficult to identify. Appears similar to Convolvulus , but anatomy suggests that the 2 genera are not very closely related.


C. occidentalis (A. Gray) Brummitt

Perennial from woody caudex; puberulent to finely tomentose
Stem decumbent to strongly climbing
Leaf: blade generally 1.5–4 cm at midrib; lobes generally ± distinct, rounded to 2-tipped; sinus rounded to ± square or tapered
Inflorescence: peduncle 1–4-flowered, < to ± > subtending leaf; bractlets 5–12 mm, linear to nearly round, sessile or stalked, entire or lobed like leaves, attached 1–15 mm below calyx, generally ± overlapping but not concealing it
Flower: sepals 9–15 mm; corolla 20–48 mm, white to creamy-yellow
Ecology: Dry slopes, chaparral, pine woods
Elevation: 300–2700 m.
Bioregional distribution: Klamath Ranges, North Coast Ranges, High Cascade Range, Sierra Nevada Foothills, High Sierra Nevada, San Francisco Bay Area, Transverse Ranges, Peninsular Ranges, Modoc Plateau
Distribution outside California: Oregon
Synonyms: Convolvulus o. A. Gray


subsp. fulcrata (A. Gray) Brummitt

Stem trailing or weakly climbing, generally < 1 m
Leaf: lobes distinct, generally 1- or 2-tipped
Inflorescence: peduncle 1-flowered; bractlets attached 2–15 mm below calyx, 5–30 mm, 2–7 mm wide, narrowly lanceolate to widely triangular, lobed like leaves
Ecology: Habitat of sp
Bioregional distribution: Sierra Nevada Foothills, Transverse Ranges, Peninsular Ranges
Synonyms: Convolvulus fulcratus (A Gray) Greene; C. deltoideus Greene
Intergrades with subsp. occidentalis, C. malacophylla , and C. macrostegia subsp. arida
Horticultural information: TRY.

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bioregional map for CALYSTEGIA%20occidentalis%20subsp.%20fulcrata being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Calystegia occidentalis subsp. fulcrata
Retrieve dichotomous key for Calystegia
Overlay Consortium of California Herbaria specimen data by county on this map
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