Jepson eFlora: Taxon page
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Tripterocalyx micranthus
SMALL-FLOWERED SAND-VERBENA

Higher Taxonomy
Family: NyctaginaceaeView DescriptionDichotomous Key

Common Name: FOUR O'CLOCK FAMILY
Habit: Annual, perennial herb, subshrub, [shrub, tree], glabrous or hairy. Stem: often forked. Leaf: opposite, sessile or petioled, pairs generally unequal; blade generally entire. Inflorescence: generally forked; spike, head-like cluster, or umbel, flowers rarely 1, bracts forming a calyx-like involucre or not. Flower: bisexual, generally +- radial (bilateral), sometimes cleistogamous in some genera; perianth of 1 whorl, generally petal-like, bell- to trumpet-shaped, base hardened, tightly surrounding ovary in fruit, lobes 3--5, generally notched to +- lobed; stamens 1--many; ovary superior (appearing inferior due to hardened perianth base), style 1. Fruit: achene in hardened perianth base; round to +- flat; smooth, angled, ribbed, or winged; glabrous, hairy, or glandular.
Genera In Family: 30 genera, 350 species: warm regions, especially America; some ornamental (Bougainvillea; Mirabilis, four o'clock).
eFlora Treatment Author: Andy Murdock, except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: TripterocalyxView DescriptionDichotomous Key

Habit: Perennial herb from large taproot. Stem: much-branched. Leaf: petioled; blade < 8 cm, fleshy, margin often wavy. Inflorescence: head or umbel; bracts 5--10, green; flowers maturing 1 side of inflorescence before the other; receptacle flat or rounded, studded with peg-shaped pedicel-like projections 1--3 mm. Flower: nocturnal, perianth trumpet-shaped, lobes 4--5; stamens 3--5, included; stigma linear, included. Fruit: wings 2--4, wide, surrounding fruit body, translucent, conspicuously net-veined.
Species In Genus: 4 species: arid North America. Etymology: (Greek, Latin: 3-winged cup, from fruit) Note: Closely related to Abronia.

Tripterocalyx micranthus (Torr.) Hook.
NATIVE
Stem: < 6 dm, glandular-sticky or scabrous. Leaf: blade 1--6 cm, narrowly ovate to elliptic, glabrous to glandular-hairy, hairs denser abaxially. Flower: perianth generally green-white to light pink.
Ecology: Sand dunes; Elevation: 800--2450 m. Bioregional Distribution: DMoj; Distribution Outside California: to Montana, South Dakota, New Mexico. Flowering Time: Apr--May
Synonyms: Abronia micrantha Torr.
eFlora Treatment Author: Andy Murdock
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

Previous taxon: Tripterocalyx crux-maltae
Next taxon: Oleaceae

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botanical illustration including Tripterocalyx micranthus

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Citation for this treatment: Andy Murdock 2016. Tripterocalyx micranthus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=47318, accessed on December 08, 2016.

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


Tripterocalyx micranthus
click for enlargement
© 2005 James M. Andre
Tripterocalyx micranthus
click for enlargement
© 2005 James M. Andre
Tripterocalyx micranthus
click for enlargement
© 2005 James M. Andre
Tripterocalyx micranthus
click for enlargement
© 2005 James M. Andre

More photos of Tripterocalyx micranthus in CalPhotos


Geographic subdivisions for Tripterocalyx micranthus:
DMoj;
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.