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Cressa truxillensis
ALKALI WEED

Higher Taxonomy
Family: ConvolvulaceaeView DescriptionDichotomous Key

Common Name: MORNING-GLORY FAMILY
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: CressaView Description 

Habit: 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.
Species In Genus: 4 species: tropics & subtropics. Etymology: (Greek: a Cretan woman)

Cressa truxillensis Kunth
NATIVE
Habit: 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. Chromosomes: 2n=28.
Ecology: Saline and alkaline substrates; Elevation: < 1500 m. Bioregional Distribution: GV, CW (exc SCoRO), SCo, ChI, GB (exc Wrn, W&I), D (exc DMtns); Distribution Outside California: to Oregon, Texas, Mexico, South America. Flowering Time: May--Oct
Synonyms: Cressa truxillensis var. vallicola (A. Heller) Munz
eFlora Treatment Author: Robert E. Preston
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Previous taxon: Cressa
Next taxon: Cuscuta

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botanical illustration including Cressa truxillensis

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Citation for this treatment: Robert E. Preston 2016. Cressa truxillensis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=21017, accessed on February 08, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 08, 2016.


Cressa truxillensis
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© 2013 Neal Kramer
Cressa truxillensis
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© 2007 Neal Kramer
Cressa truxillensis
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© 2014 Neal Kramer
Cressa truxillensis
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© 2003 George W. Hartwell
Cressa truxillensis
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© 2010 James M. Andre
Cressa truxillensis
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© 2013 Neal Kramer

More photos of Cressa truxillensis in CalPhotos


Geographic subdivisions for Cressa truxillensis:
GV, CW (exc SCoRO), SCo, ChI, GB (exc Wrn, W&I), D (exc DMtns);
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.
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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.