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Calystegia macrostegia subsp. tenuifolia

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
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. tenuifolia (Abrams) Brummitt
Habit: Plant glabrous to puberulent. Stem: trailing or weakly climbing. Leaf: blade linear to narrowly triangular; lobes linear; sinus rounded or square. Inflorescence: bracts 8--14 mm, 4--8 mm wide, narrowly lanceolate, flat, tip acute. Flower: sepals 7--10 mm; corolla 22--40 mm.
Ecology: Dry, +- inland areas; Elevation: generally < 500 m. Bioregional Distribution: c&s SCoR, SCo, w PR; Distribution Outside California: Baja California. Flowering Time: May Note: Intergrades with Calystegia longipes, Calystegia macrostegia subsp. arida, Calystegia macrostegia subsp. intermedia; extent to which narrowness of leaves determined by environment (vs genetics) needs study, especially in Mexico.
Synonyms: Convolvulus aridus Greene subsp. tenuifolius Abrams
eFlora Treatment Author: R.K. Brummitt
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botanical illustration including Calystegia macrostegia subsp. tenuifolia


Citation for this treatment: R.K. Brummitt 2016. Calystegia macrostegia subsp. tenuifolia, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 04, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 04, 2016.

Geographic subdivisions for Calystegia macrostegia subsp. tenuifolia:
c&s SCoR, SCo, w PR;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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.
Blue line denotes eFlora flowering time.