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Calystegia macrostegia subsp. intermedia

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 macrostegiaView Description 

Habit: Perennial herb, subshrub from woody caudex, glabrous to densely short-hairy. Stem: slender, weakly climbing to woody, or strongly climbing, 1--9 m. Leaf: < 13 cm, generally widely triangular, lobed. Inflorescence: peduncle 1- to several-flowered, generally > subtending leaf; bracts +- hiding calyx, 6--37 mm, 4--30 mm wide, lanceolate to +- round, entire, flat to sac-like. Flower: sepals 7--25 mm; corolla 22--68 mm, white or fading pink.

Calystegia macrostegia subsp. intermedia (Abrams) Brummitt
Habit: Plant glabrous to puberulent. Stem: trailing or climbing. Leaf: lobes rounded to 2-angled; sinus +- acute to rounded or square. Inflorescence: bracts 10--20 mm, 6--12 mm wide, lanceolate, not or +- keeled. Flower: sepals 9--16 mm; corolla 32--40 mm.
Ecology: Coastal or inland hills; Elevation: generally < 200 m. Bioregional Distribution: SCo, s ChI, s WTR, SnGb, n PR (incl SnJt). Flowering Time: Mar--Aug Note: Intergrades with other subspecies, probably with Calystegia peirsonii.
Synonyms: Convolvulus aridus Greene subsp. intermedius Abrams; Convolvulus aridus subsp. longilobus Abrams;
Jepson eFlora Author: R.K. Brummitt
Reference: Brummitt 2002 Madroño 49:130--131
Unabridged Reference: Brummitt 1980 Kew Bull 35(2):327--328
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Botanical illustration including Calystegia macrostegia subsp. intermedia

botanical illustration including Calystegia macrostegia subsp. intermedia


Citation for this treatment: R.K. Brummitt 2012, Calystegia macrostegia subsp. intermedia, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on December 15, 2018.

Citation for the whole project: Jepson Flora Project (eds.) 2018, Jepson eFlora,, accessed on December 15, 2018.

Calystegia macrostegia subsp. intermedia
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© 2016 Aaron E. Sims and CNPS

More photos of Calystegia macrostegia subsp. intermedia in CalPhotos

Geographic subdivisions for Calystegia macrostegia subsp. intermedia:
SCo, s ChI, s WTR, SnGb, n PR (incl SnJt).
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, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.