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Key to families | Table of families and genera

Previous taxon Indexes to all accepted names and synonyms:
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Robert E. Preston, except as noted

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).
55–60 genera, 1600–1700 species: warm temperate to tropics; some cultivated for food or as ornamental (Ipomoea). [Stefanovic et al. 2003 Syst Bot 28:791–806] 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. —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Angiosperm Phylogeny Group 1998 Ann Missouri Bot Gard 85:531–553; Stefanovic et al. 2002 Amer J Bot 89:1510–1522]

Key to Convolvulaceae

Perennial herb, subshrub, canescent. Stem: prostrate to erect, not twining. Leaf: entire. Inflorescence: flowers 1 in upper leaf axils, on ± 1 side of stem. Flower: calyx ± erect, hiding corolla tube; corolla lobes ± = tube; styles 2, stigma head-like.
4 species: tropics & subtropics. (Greek: a Cretan woman) [Austin 2000 Bot J Linn Soc 133:27–39]

C. truxillensis Kunth ALKALI WEED
Plant tufted. Stem: 7–25 cm, much-branched from base, densely silky-canescent. Leaf: < 1 cm, ± sessile, elliptic. Inflorescence: peduncle short, bracted. Flower: 5–8 mm; sepals elliptic; corolla white, persistent, lobes ovate, acute; stamens, styles exserted. Seed: often 1, by abortion.
2n=28. Saline and alkaline substrates; < 1500 m. Great Central Valley, Central Western California (except Outer South Coast Ranges), South Coast, Channel Islands, Great Basin Floristic Province (except Warner Mountains, White and Inyo Mountains), Desert (except Desert Mountains); to Oregon, Texas, Mexico, South America. [Cressa truxillensis var. vallicola (A. Heller) Munz] May–Oct [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Nov 25 2015
Citation for this treatment: [Author of taxon treatment] 2013. Cressa, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Nov 25 2015

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Geographic subdivisions indicated for the distribution of Cressa truxillensis 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.