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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 July 26, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on July 26, 2016.


Cressa truxillensis
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© 2010 Gary A. Monroe
Cressa truxillensis
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© 2013 Neal Kramer
Cressa truxillensis
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© 2007 Neal Kramer
Cressa truxillensis
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© 2010 James M. Andre
Cressa truxillensis
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© 2013 Neal Kramer
Cressa truxillensis
click for enlargement
© 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. 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.
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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.