Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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RHAMNACEAE

BUCKTHORN FAMILY

John O. Sawyer, Jr. (except Ceanothus)

Shrub, vine, tree, generally erect, often thorny
Leaves simple, generally alternate, often clustered on short-shoots, generally petioled, generally stipuled; blade often 1–3-ribbed from base
Inflorescence: cyme, panicle, or flowers solitary in axils
Flower generally bisexual, radial; hypanthium subtending, surrounding, or partly fused to ovary; sepals 4 or 5; petals 0, 4, or 5, clawed; stamens 4 or 5, alternate sepals, attached to hypanthium top, each generally fitting into a petal concavity; ovary superior or partly inferior, chambers 2–5, each 1–2-ovuled, style lobes or parts 1–3
Fruit: capsule, drupe
Genera in family: 55 genera, 900 species: especially tropical, subtropical; some cultivated (Ceanothus ; Colletia , anchor-plant; Gouania ; Phylica ; Rhamnus ; Ventilago ; Ziziphus )
Reference: [Brizicky 1965 J Arnold Arbor 45:439–463]

ZIZIPHUS

Tree, shrub, vine
Stem: branches alternate, flexible, sometimes 2–3-ranked; twigs thorn-tipped
Leaves in part clustered on short-shoots, deciduous or evergreen, petioled; stipules sometimes unequal spines; blade ovate to oblong, 1–3-ribbed from base, ± entire to serrate
Inflorescence: cyme or small panicle
Flower: hypanthium surrounding base of ovary; sepals 5; petals 5, < or = sepals; stamens 5; ovary broadly attached at base, chambers 2, each 1-ovuled, styles 2
Fruit: drupe, stone 1
Species in genus: 100 species: generally tropical
Etymology: (Latin: reason for application obscure)
Reference: [Johnston 1963 Amer J Bot 50:1020–1027]

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bioregional map for ZIZIPHUS being generated
 
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