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]

CONDALIA

Shrub
Stem: branches alternate, rigid, 3-ranked; twigs spreading, thorn-tipped
Leaves clustered on short-shoots, deciduous; stipules deciduous; petioles ± 0 or short; blade obovate, 1-ribbed from base, entire
Inflorescence: flowers solitary or in clusters on short-shoots
Flower: hypanthium below, not surrounding ovary, becoming flat after flower, persistent below fruit; sepals 5, deciduous; petals generally 0; stamens 5; ovary spheric, strongly narrowed at base, chambers 2, each 1-ovuled, style 1
Fruit: drupe, stone 1
Seed tightly held in stone
Species in genus: 18 species: arid Am
Etymology: (A. Condal, Spanish physician, 1745–1804)
Reference: [Johnston 1962 Brittonia 14:332–368]

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