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SAXIFRAGACEAE SAXIFRAGE FAMILY

Michael S. Park & Patrick E. Elvander, except as noted

Perennial herb from caudex or rhizome, generally ± hairy. Stem: often ± leafy on proximal 1/2, rarely trailing and leafy throughout. Leaf: generally simple, basal and/or cauline, generally alternate, generally petioled; veins ± palmate. Inflorescence: raceme or panicle, generally ± scapose. Flower: generally bisexual, generally radial; hypanthium free to ± fused to ovary; calyx lobes generally 5; petals generally 5, free, generally clawed, generally white; stamens 3, [4], 5, 8, or 10; pistils 1 (carpels ± fused, ovary lobed, chambers 1 or 2, placentas generally 2(3), axile or parietal or occasionally proximally axile and distally marginal in ovary lobes) or 2 (carpels free, placentas marginal), ovary nearly superior to inferior, occasionally more superior in fruit, styles generally 2(3). Fruit: capsule (generally 2(3)-beaked, valves generally 2(3), generally equal) or 2 follicles. Seed: generally many, small.
± 30 genera, 600 species: especially northern temperate, arctic, alpine; some cultivated (Bergenia, Darmera, Heuchera, Saxifraga, Tellima, Tolmiea). [Soltis et al. 2001 Ann Missouri Bot Gard 88:669–693; Okuyama et al. 2008 Molec Phylogen Evol 46:560–575] California Mitella moved to Mitellastra, Ozomelis, Pectiantia; Suksdorfia ranunculifolia to Hemieva. Parnassia moved to Parnassiaceae. —Scientific Editor: Bruce G. Baldwin.
Unabridged references: [Soltis 1988 Syst Bot 13:64–72]

Key to Saxifragaceae

SAXIFRAGA SAXIFRAGE

Michael S. Park

Plant generally ± hairy, often glandular; caudex or rhizome generally not woody, generally scaly. Leaf: blade obovate to round, base tapered to reniform or cordate, margin lobed. Inflorescence: raceme or panicle; flowers 1–many; bracts scale-like. Flower: hypanthium free or ± fused to ovary; [petals sometimes spotted]; stamens 10, filaments generally flat; pistil 1, ovary superior to ± inferior (sometimes more superior in fruit), chambers 2, placentas 2, axile, styles 2, free throughout. Fruit: capsule.
± 300 species: cool northern temperate, boreal, arctic. (Latin: rock-breaking) Saxifraga stolonifera W. Curtis cultivated only. Other taxa in TJM (1993) moved to Cascadia, Micranthes.

Key to Saxifraga

Previous taxon: Pectiantia pentandra
Next taxon: Saxifraga cespitosa

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 30 2014
Citation for this treatment: [Author of taxon treatment] 2013. Saxifraga, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=11340, accessed on Jul 30 2014

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