| 1. Pistillate pedicel generally < 3 mm; ovary generally 3-lobed, 3-chambered; styles generally 3; stamen filaments glabrous; leaves generally alternate se Mojave Desert, Sonoran Desert |
| T. hallii |
| 1' Pistillate pedicel 615 mm; ovary generally 4-lobed, 4-chambered; styles generally 4; stamen filaments soft-hairy at base; leaves opposite or whorled in 3's |
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| 2. Leaf blade linear to narrowly oblanceolate, entire to sparsely fine-toothed; s South Coast, Peninsular Ranges |
| T. dioicus |
| 2' Leaf blade ovate, lanceolate to ovate, sharp-toothed; n Desert Mountains (Grapevine, Panamint mtns) |
| T. ilicifolius
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