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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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[Perennial herb] shrub, tree, generally erect, often thorny. Leaf: simple, generally alternate, often clustered on short-shoots; stipules generally present, occasionally modified into spines; generally petioled; blade pinnate-veined or 1–5-ribbed from base. Inflorescence: cyme, panicle, umbel, or flowers 1 or clustered in axils or on short-shoots. Flower: generally bisexual, radial; hypanthium subtending, surrounding, or partly fused to ovary; sepals 4–5; petals 0, 4–5, generally clawed; stamens 0, 4–5, alternate sepals, attached to hypanthium top, each generally fitting into a petal concavity; disk (0 or) between stamens, ovary, thin to fleshy, entire or lobed, free from ovary, adherent or fused to hypanthium; ovary superior or ± inferior, chambers 2–4, 1–2-ovuled, style 1, stigma entire or 2–3-lobed. Fruit: capsule, drupe.
50–52 genera, 950 species: especially tropics, subtropics some cultivated (Ceanothus; Frangula; Rhamnus; Ziziphus). [Richardson et al. 2000 Amer J Bot 87:1309–1324] —Scientific Editors: Steve Boyd, Thomas J. Rosatti.
Unabridged references: [Brizicky 1965 J Arnold Arbor 45:439–463; Richardson et al. 2000 Kew Bull 55:311–341]
Key to Rhamnaceae
Tree, shrub [vine]. Stem: branches alternate, flexible or stiff, ± 2–3-ranked; twigs ± pendent, zigzag. Leaf: clustered on short-shoots or not, deciduous or not, petioled; stipules ± spine-like or not, unequal; blade elliptic to obovate, ± entire to serrate, 1–5-ribbed from base. Inflorescence: cyme or small panicle. Flower: hypanthium surrounding base of ovary; sepals 5; petals 5, < to > sepals; stamens 5; disk thick, ± obscuring ovary in early flower; ovary widely attached at base, chambers 2, each 1-ovuled, stigma 2-lobed. Fruit: drupe, stone 1.Key to Ziziphus
100 species: generally tropics. (Latin: from Arabic "zizouf", common jujube, Ziziphus zizyphus) [Islam & Simmons 2006 Syst Bot 31:826–842]
Unabridged references: [Johnston 1963 Amer J Bot 50:1020–1027]
Tree, < 12 m. Stem: bark gray to black, shaggy; twigs pendent, zigzag. Leaf: deciduous; blade 25–60 mm, elliptic to obovate, ± leathery, bright green, shiny adaxially, paler, dull abaxially, margin serrate. Inflorescence: 2–8-flowered clusters at nodes on twigs. Flower: hypanthium 2–2.2 mm wide, green; sepals < petals, both yellow; stamens < petals; pistil green. Fruit: Fleshy, red.
Occasional garden escape; 270 m. n Sierra Nevada Foothills, n Sacramento Valley; United States, Old World. [Ziziphus jujuba Mill.] Correct name could become Ziziphus jujuba Mill. May–Jul [Online Interchange]
Unabridged note: A proposal (1753; Kirkbride et al. 2006 Taxon 55:1049–1050) has been made to conserve Ziziphus jujuba against Ziziphus zizyphus, but until such time as that proposal is given final approval, the nomenclaturally correct name for Ziziphus jujuba Mill., nom. cons. prop. is Ziziphus zizyphus (L.) H. Karst. nom. rej. prop. Ziziphus mauritiana Lam. reported from California in error (USDA Plants Database).
Previous taxon: Ziziphus parryi var. parryi
Next taxon: Rosaceae
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Mar 12 2014
Citation for this treatment: [Author of taxon treatment] 2012. Ziziphus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=48939, accessed on Mar 12 2014
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