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Key to families | Table of families and genera
Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.
Plant generally 0.5–2 m; sap clear. Stem: axis erect; branches generally many, spreading to erect; twigs generally ± red, turning gray, generally hairy, glabrous in age; young lateral twigs short, sometimes becoming spine-like. Leaf: cauline, generally clustered at short, lateral branch tips; petiole < 2 mm; blade leathery, base obtuse to acute. Staminate inflorescence: cyme, raceme, or panicle, occasionally clustered on short, lateral twigs, minute-bracted. Pistillate inflorescence: flower 1. Staminate flower: sepals 0.5–2 mm; filaments glabrous or hairy; nectary disk ± minute-lobed. Pistillate flower: sepals 2–5 mm; nectary disk minute-lobed; ovary (2)3–5-chambered, style = chamber in number, free, ± flat, generally spreading. Fruit: ± spheric, generally lobed, glabrous or short-hairy, generally brown. Seed: smooth, shiny.
5 species: California, Arizona, Mexico. (Latin: 4 seeds, from 4-lobed ovary in Tetracoccus dioicus) [Dressler 1954 Rhodora 56:45–61]
1. Pistillate pedicel 0.5–1(3) mm; ovary generally 3-lobed, generally 3-chambered; styles generally 3; filaments glabrous; leaves generally alternate — se Mojave Desert, Sonoran Desert ..... T. hallii
1' Pistillate pedicel 6–15 mm; ovary generally 4-lobed, 4-(5-)chambered; styles generally 4; filaments soft-hairy at base; leaves opposite or whorled in 3s
2. Leaf blade linear to narrow-oblanceolate, entire or sparsely fine-toothed; s South Coast (San Diego Co.), w Peninsular Ranges ..... T. dioicus
2' Leaf blade lanceolate to ovate or wide-elliptic, sharp-toothed; n Desert Mountains (Grapevine Mtns, Panamint Range) ..... T. ilicifolius
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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