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Andy Murdock, except as noted

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.
30 genera, 350 species: warm regions, especially America; some ornamental (Bougainvillea; Mirabilis, four o'clock). [Spellenberg 2003 FNANM 4:14–17] —Scientific Editor: Thomas J. Rosatti.

Key to Nyctaginaceae

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.
4 species: arid North America. (Greek, Latin: 3-winged cup, from fruit) [Galloway 2003 FNANM 4:70–71] Closely related to Abronia.

Key to Tripterocalyx

T. crux-maltae (Kellogg) Standl. KELLOGG'S SAND-VERBENA
Stem: < 3 dm, glandular-sticky. Leaf: blade 2.5–7 cm, ovate to elliptic, ± glandular-hairy. Flower: perianth generally pink to magenta. Fruit: raised ribs extending into wings.
Sagebrush scrub; 1200–1500 m. Modoc Plateau (Lassen Co.); northwestern Nevada. [Abronia crux-maltae Kellogg] Reported for but not collected in California (Lassen Co.). May–Jun [Online Interchange] {CNPS list}
Unabridged note: As of 17 Jan 2007: Glenn Clifton confirms having seen fewer than 100 plants on private property in California (and having moved an existing pipeline in order to save them), but did not collect a specimen; specimens collected by Gary Schoolcraft and listed for California by CalFlora were actually collected in Nevada according to Schoolcraft.

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Dec 1 2015
Citation for this treatment: [Author of taxon treatment] 2013. Tripterocalyx, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Dec 1 2015

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Geographic subdivisions indicated for the distribution of Tripterocalyx crux-maltae 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.