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. collina (Greene) Brummitt

Perennial from rhizome, generally densely tomentose; hairs generally long, brownish
Stem decumbent, 8–30 cm, not or weakly climbing
Leaf generally < 3 cm at midrib, reniform (basal lobes indistinct) to distinctly lobed; margin generally wavy
Inflorescence: peduncle < 6 cm, sometimes > subtending leaf; bractlets 7–17 mm, 2–14 mm wide, ± linear to widely ovate, entire, attached just below calyx, partly to entirely concealing it
Flower: sepals 8–13 mm; corolla 25–55 mm, white
Ecology: Open grassy or rocky places or in open oak/pine woods, often on serpentine
Elevation: < 600 m.
Bioregional distribution: North Coast Ranges, San Francisco Bay Area, South Coast Ranges
Synonyms: Convolvulus c. Greene; C. malacophyllus subsp. c. (Greene) Abrams


subsp. collina

Plant hairs sometimes grayish
Stem 8–15 cm
Leaf reniform to triangular; lobes generally not clearly defined
Inflorescence: bractlets 8–15 mm, 6–14 mm wide, widely ovate, ± concealing calyx
Flower: sepals glabrous or strigose at center; corolla 30–54 mm
Ecology: Habitat of sp.
Bioregional distribution: North Coast Ranges, San Francisco Bay Area
Horticultural information: 7, 8, 9, 14; SUN; 15, 16, 17; GRCVR; INV.

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bioregional map for CALYSTEGIA%20collina%20subsp.%20collina 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 collina subsp. collina
Retrieve dichotomous key for Calystegia
Overlay Consortium of California Herbaria specimen data by county on this map
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