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. macrostegia (Greene) Brummitt

Perennial or subshrub from woody caudex, glabrous to densely short-hairy
Stem slender and weakly climbing to woody and high-climbing, 1–9 m
Leaf < 13 cm, generally widely triangular and lobed
Inflorescence: peduncle 1–several-flowered, generally > subtending leaf; bractlets 6–37 mm, 4–30 mm wide, lanceolate to ± round, entire, flat to sac-like, attached just below calyx and ± concealing it
Flower: sepals 7–25 mm; corolla 22–68 mm, white or fading pink
Ecology: Generally, dry, rocky ± coastal places
Elevation: < 1000 m.
Bioregional distribution: Central Coast, c&s South Coast Ranges, Southwestern California
Distribution outside California: to Mexico
Synonyms: Convolvulus macrostegius Greene, C. occidentalis var. macrostegius (Greene) Munz


subsp. tenuifolia (Abrams) Brummitt

Plant glabrous to puberulent
Stem trailing or low-climbing
Leaf: blade linear to very narrowly triangular; lobes linear; sinus rounded or square
Inflorescence: bractlets 8–14 mm, 4–8 mm wide, narrowly lanceolate, flat, tip acute
Flower: sepals 7–10 mm; corolla 22–40 mm
Ecology: Dry, ± inland places
Elevation: generally < 500 m.
Bioregional distribution: c&s South Coast Ranges, South Coast, w Peninsular Ranges
Distribution outside California: Baja California
Synonyms: Convolvulus aridus subsp. t. Abrams
Intergrades with subsp. intermedia , subsp. arida, C. longipes
Horticultural information: TRY.

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