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• Taxonomy
• Physical Description
• Distribution
• Similar Species
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Taxonomy

Notes:

Place of publication: Edwards's Bot. Reg. 15: t. 1302. 1829

Name verified on 24-Aug-1995 by ARS Systematic Botanists. Last updated: 10-May-2007

Physical Description

Family Saxifragaceae:

Herbs or shrubs, rarely trees or vines. Leaves simple or compound, usually alternate or opposite, usually exstipulate. Flowers usually in cymes, panicles, or racemes, rarely solitary, usually bisexual, rarely unisexual, hypogynous or ± epigynous, rarely perigynous, usually biperianthial, rarely monochlamydeous, actinomorphic, rarely zygomorphic, 4- or 5(-10) -merous. Sepals sometimes petal-like. Petals usually free, sometimes absent. Stamens (4 or) 5-10 or many; filaments free; anthers 2-loculed; staminodes often present. Carpels 2, rarely 3-5(-10), usually ± connate; ovary superior or semi-inferior to inferior, 2- or 3-5(-10) -loculed with axile placentation, or 1-loculed with parietal placentation, rarely with apical placentation; ovules usually many, 2- to many seriate, crassinucellate or tenuinucellate, sometimes with transitional forms; integument 1- or 2-seriate; styles free or ± connate. Fruit a capsule or berry, rarely a follicle or drupe. Seeds albuminous, rarely not so; albumen of cellular type, rarely of nuclear type; embryo small.

About 80 genera and 1200 species: worldwide; 29 genera (two endemic), and 545 species (354 endemic, seven introduced) in China.

During the past several years, cladistic analyses of morphological, chemical, and DNA data have made it clear that the recognition of the Saxifragaceae sensu lato (Engler, Nat. Pflanzenfam. 18a: 74-226. 1928) is untenable. Among the angiosperm families, Saxifragaceae sensu lato may in fact represent the most extreme example of a polyphyletic assemblage. For example, recent analyses of DNA sequence data indicate that these taxa represent at least ten separate evolutionary lines, many of which are only distantly related to one another (Morgan & Soltis, Ann. Missouri Bot. Gard. 80: 631-660. 1993; Soltis & Soltis, Amer. J. Bot. 84: 504-522. 1997) . Furthermore, very large molecular phylogenetic analyses of hundreds of angiosperms indicate that these separate lineages are distributed among four of the six traditionally recognized subclasses of dicotyledons (Savolainen et al., Syst. Biol. 49: 306-362. 2000; Soltis et al., Nature 402: 402-404. 1999) . These recent studies have also greatly clarified how this phylogenetically diverse assemblage should be divided into families and treated taxonomically (see The Angiosperm Phylogeny Group (APG), Ann. Missouri Bot. Gard. 85: 531-553. 1998) . Recent studies of DNA sequence data have clarified both the circumscription and affinities of a narrowly defined Saxifragaceae (Saxifragaceae sensu stricto) and Hydrangeaceae (Soltis et al., Amer. J. Bot. 82: 504-514. 1995; Savolainen et al., loc. cit.; Soltis et al., loc. cit. 1999) . Saxifragaceae sensu stricto should consist only of Saxifragoideae, a group of about 30 herbaceous genera. Members of Saxifragaceae sensu stricto from the Chinese flora include Astilbe, Astilboides, Bergenia, Chrysosplenium, Mitella, Mukdenia, Oresitrophe, Rodgersia, Saxifraga, Tanakaea, Tiarella, and the recently described Saniculiphyllum. Close relatives of Saxifragaceae sensu stricto include Itea, Penthorum, and Ribes. These genera, the sole members of Iteoideae, Penthoroideae, and Ribesioideae, respectively, are also best treated in separate families: Iteaceae, Penthoraceae, and Grossulariaceae (see APG, loc. cit.) . These taxa, as well as several others, such as Crassulaceae, are basal to a large assemblage of taxa, most of which were traditionally placed in Rosidae. Sequence data also indicate that Parnassia (the sole member of the Parnassioideae) is a more derived member of the rosid alliance, most closely related to Brexia and Lepuropetalon (also part of Saxifragaceae sensu lato) and Celastraceae. Parnassia and Lepuropetalon should be placed in Parnassiaceae with Brexia part of an expanded Celastraceae (APG, loc. cit.) .

Both morphological and molecular data indicate that Hydrangeoideae and Escallonioideae are, in contrast, allied with taxa traditionally placed in Asteridae. Hydrangeoideae are a well-defined, monophyletic lineage that should be treated as Hydrangeaceae. In China they include Cardiandra, Decumaria, Deinanthe, Deutzia, Dichroa, Hydrangea, Kirengeshoma, Philadelphus, Pileostegia, Platycrater, and Schizophragma, and are closely allied with families such as Cornaceae, Loasaceae, and Nyssaceae. Escallonioideae appear to be polyphyletic, and this group of approximately 14 genera is in need of thorough study. Members of this subfamily are allied with several different lineages of higher asterids. Polyosma, the only member of Escallonioideae in China, appears closely allied with Caprifoliaceae (Xiang & Soltis in Boufford & Ohba, Sino-Japanese Flora: its Characteristics and Diversification, 1998) .^[1]

Distribution

Range and Population

Native: British Columbia, California, Oregon, Washington.

Similar Species

Members of the genus Heuchera:

There are approximately 706 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them: H. easthamii · H. rosea · H. 'Adriana' (Adriana Alum Root Heuchera) · H. 'Amber Waves' (Alumroot) · H. 'Amethyst Myst' (Alumroot) · H. 'Angel's Pink' (Alumroot) · H. 'Apple Blossom' · H. 'Auburn' · H. 'Autumn Haze' (Alumroot) · H. 'Autumn Leaves' · H. 'Baby's Breath' · H. 'Barbara' (Alumroot) · H. 'Barbara's Findling' (Alumroot) · H. 'Beauty Color' (Alumroot) · H. 'Beauty Colour' · H. 'Black Beauty' (Alumroot) · H. 'Black Bird' · H. 'Black Velvet' · H. 'Blackbird' (Alumroot) · H. 'Blood Red' (Alum Root) · H. 'Blood Vein' (Alumroot) · H. 'Blushing Bells' (Alumroot) · H. 'Blushing Bride' · H. 'Bressingham hybrids' (Alumroot) · H. 'Bressingham Reds' (Alumroot) · H. 'Bronze Beacon' (Alumroot) · H. 'Brown Coral' · H. 'Burgundy Frost' (Alumroot) · H. 'Can-can' (Alumroot) · H. 'Canyon Belle' (Alumroot) · H. 'Canyon Chimes' (Alumroot) · H. 'Canyon Delight' (Alumroot) · H. 'Canyon Duet' (Alumroot) · H.'Canyon Melody' (Alum Root) · H. 'Canyon Pink' (Alumroot) · H. 'Cappuccino' (Alumroot) · H. 'Caramel' · H. 'Carmen' (Alumroot) · H. 'Carousel' (Alumroot) · H. 'Cascade Dawn' · H. 'Cathedral Windows' (Alumroot) · H. 'Chablo' · H. 'Champagne Bubbles' (Alumroot) · H. 'Charles Blooms' (Alumroot) · H. 'Chartreuse' (Alumroot) · H. 'Checkers' (Alumroot) · H. 'Cherries Jubilee' (Alumroot) · H. 'Cherry Red' · H. 'Chimes and Duet' · H. 'Chinook' (Alum Root) · H. 'Chiqui' (Alumroot) · H. 'Chocolate Ruffles' (Alumroot) · H. 'Chocolate Veil' · H. 'Cinnabar Silver' (Coral Bells) · H. 'City Lights' (Alum Root) · H. 'Color Dream' (Alum Root) · H. 'Constance' (Alumroot) · H. 'Coral Bouquet' (Alumroot) · H. 'Coral Cloud' · H. 'Crème Caramel' · H. 'Creme De Menthe' (Alum Root) · H. 'Crimson Cascade' · H. 'Crimson Curls' (Alumroot) · H. 'Crispy Curly' (Alumroot) · H. 'Crown Jewel' (Alumroot) · H. 'Cultus Bay Beauty' (Alumroot) · H. 'Dainty Bells' (Alumroot) · H. 'Dainty' · H. 'Damask' · H. 'Dappled Barbara' (Alumroot) · H. 'Dark Beauty' · H. 'Dark Delight' (Alumroot) · H. 'David' (Alumroot) · H. 'Dennis Davidson' · H. 'Diana Clare' (Alumroot) · H. 'Dingle Amber' · H. 'Dingle Mint Chocolate' · H. 'Dolce Creme Brulee' (Creme Brulee Alum Root) · H. 'Dolce Key Lime Pie' (Alum Root) · H. 'Dolce Peach Melba' (Alum Root) · H. 'E and I' · H. 'Ebony & Ivory' (Ebony and ivory Coral Bells) · H. 'Ebony and Ivory' (Alumroot) · H. 'Eco Improved' · H. 'Eco Magnifica' · H. 'Eco Magnififolia' · H. 'Eco-Improved' (Alumroot) · H. 'Eco-Magnifolia' (Alumroot) · H. 'Eden's Aurora' (Alumroot) · H. 'Eden's Joy' (Alumroot) · H. 'Eden's Mystery' (Alumroot) · H. 'Eden's Shine' (Alumroot) · H. 'Emperor's Cloak' (Alumroot) · H. 'Emperor's Cloak' green · H. 'Fandango' (Alum Root) · H. 'Fantasia' (Alum Root) · H. 'Feuerlohe' (Alumroot) · H. 'Firebird' · H. 'Fireworks' · H. 'Florist's Choice' (Alumroot)

Bibliography

• Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. (F CalifJep)
• Hitchcock, C. L. et al. 1955–1969. Vascular plants of the Pacific Northwest. (F Pacif NW)
• Huxley, A., ed. 1992. The new Royal Horticultural Society dictionary of gardening. (Dict Gard)
• Hwang Shu-mei, Wei Chao-fen, Lu Ling-ti, Ku Tsue-chih &
• Hwang Shu-mei, eds., Fl. Reipubl. Popularis Sin. 35(1): 1-406.
• Jin Shu-ying. 1995. Saxifragaceae (2) [Parnassioideae, Hydrangeoideae, Escallonioideae, Iteoideae, Ribesioideae]. In: Lu Ling-ti &
• McGuffin, M. et al., eds. 2000. Herbs of commerce, ed. 2. (Herbs Commerce ed2)
• Pan Jin-tang. 1992. Saxifragaceae (1) [Penthoroideae, Saxifragoideae]. In: Pan Jin-tang, ed., Fl. Reipubl. Popularis Sin. 34(2): 1-309
• Scoggan, H. J. 1978–1979. The flora of Canada, 4 vol. (F Canada) [= H. micrantha Dougl.].

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Notes

Contributors:

• Brands, S.J. (comp.) 1989-2007. Systema Naturae 2000. The Taxonomicon. Universal Taxonomic Services, Amsterdam, The Netherlands. Accessed March 28, 2007.
• USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Online Database]. National Germplasm Resources Laboratory, Beltsville, Maryland. URL (May 04, 2008)

Identifiers:

• Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 528416
• Germplasm Resources Information Network (GRIN) NomenNumber: 18966
• Natural Heritage Network Species Identifier: PDSAX0E0P5
• Zipcode Zoo Species Identifier: 169199

Footnotes:

1. Jin-tang Pan, Cuizhi Gu, Shumei Huang, Chao-fen Wei, Shu-ying Jin, Lingdi Lu, Shinobu Akiyama, Crinan Alexander, Bruce Bartholomew, James Cullen, Richard J. Gornall, Ulla-Maj Hultgård, Hideaki Ohba & Douglas E. Soltis "Saxifragaceae". in Flora of China Vol. 8 Page 269. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org.