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CROSSOSOMATACEAE CROSSOSOMA FAMILY

Robert E. Preston & James R. Shevock

Shrub, small tree. Stem: generally glabrous; branchlets or twigs generally thorny. Leaf: generally deciduous, simple, generally small, generally alternate, entire; stipules minute or 0. Inflorescence: flowers 1. Flower: generally bisexual, radial; hypanthium short; sepals, petals generally 5(3–6), free; petals generally white, ephemeral; stamens 4–50, on or around disk; pistils 1–9, simple, styles short, stigmas head-like, ovules generally 2–many. Fruit: follicles, 1–9. Seed: brown to black, arilled.
4 genera, 9 species: western United States, Mexico. [Sosa & Chase 2003 Syst Bot 28:96–105] —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Thorne & Scogin 1978 Aliso 9:171–178; Sosa & Chase 2003 Syst Bot 28:96–105]

Key to Crossosomataceae

CROSSOSOMA
Leaf: deciduous (or dry when dormant); petiole 0–short. Inflorescence: peduncle bracted or not. Flower: petals 9–15 mm, ± round or oblong, generally white. Fruit: cylindric, surface smooth or net-like, beak 1–2 mm. Seed: generally > 2 per fruit, black, shiny, round to flat; aril conspicuous, fringed, ± yellow.
2 species: southern California to Arizona, Mexico. (Greek: fringe body, from aril)

Key to Crossosoma

Previous taxon: Crossosomataceae
Next taxon: Crossosoma bigelovii

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 22 2014
Citation for this treatment: [Author of taxon treatment] 2013. Crossosoma, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=9845, accessed on Oct 22 2014

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