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• Physical Description
• Distribution
• Growth
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Taxonomy

Notes:

Publishing author: Bory & Chaub. Publication: Nouv. Fl. Pelop. 26

A tentatively accepted name in the RHS Horticultural Database.

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]

Genus Saxifraga:

Herbs perennial, rarely annual or biennial. Stem cespitose or simple. Leaves both basal and cauline, petiolate or not; leaf blade simple, entire, margin dentate or lobate; cauline leaves usually alternate, rarely opposite. Inflorescence a solitary flower or few- to many-flowered cyme, bracteate. Flowers usually bisexual, sometimes unisexual, actinomorphic, rarely zygomorphic; receptacle cyathiform or saucer-shaped. Sepals (4 or) 5(or 7 or 8) . Petals (4 or) 5, yellow, orange, white, or red to purple, callose or not, distinctly veined, margin usually entire. Stamens (8 or) 10; filaments subulate or clavate. Carpels 2, usually connate at least in placental region; ovary superior to inferior, usually 2-loculed; placentation usually axile; ovules many; integuments 1 or 2; nectary disc sometimes well developed, annular or semiannular. Fruit a 2-valved capsule. Seeds many.

About 450 species: Asia, Europe, North America, South America (Andes), mainly in alpine areas; 216 species (139 endemic) in China.^[2]

Habit: Evergreen.

Flowers: Bloom Period: January, February, March. • Flower Color: near white, white

Distribution

Growth

Culture: Space 12-15" apart.

Soil: Minimum pH: 6.1 • Maximum pH: 8.5

Sunlight: Sun Exposure: Sun to Partial Shade.

Temperature: Cold Hardiness: 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b. (map)

Similar Species

Members of the genus Saxifraga:

There are approximately 2,977 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them: S. aculeata kansuensis · S. aspera etrusca · S. bronchialis codyana · S. caespitosa exaratioides · S. caespitosa gemmifera · S. carpetana atlantica · S. carpetana graeca · S. caspitosa sileneflora · S. cherlerioides ascoldica · S. cherlerioides stellerana · S. corsica ebusitana · S. cuneata corbariensis · S. cuneata paniculata · S. derbekii xerophylla · S. exarata ampullacea · S. exarata basaltica · S. exarata carniolica · S. exarata delphinensis · S. exarata fastigiata · S. exarata lamottei · S. exarata pseudoexarata · S. exarata suaveolens · S. fragilis valentina · S. fragosa claytoniaefolia · S. globulifera granatensis · S. granulata fernandesii · S. groenlandica exaratioides · S. gyacaensis alpina · S. hieraciifolia czukczorum · S. intricata moncayensis · S. merkii myosotifolia · S. nudicaulis soczavae · S. oppositifolia ajanica · S. paniculata laestadii · S. pensylvanica eupensylvanica · S. pentadactylis almanzorii · S. platysepala crandallii · S. punctata redowskyana · S. rosacea steinmannii · S. spinulosa funstonii · S. stenophylla hoffmeisteri · S. subverticillata colchica · S. willkommiana caballeroi · S. adscendens subsp. oregonensis · S. ambigua · S. andrewsii · S. anglica · S. apiculata · S. aretioides · S. bertolonii · S. biasoletti · S. borisii · S. boydilacina · S. elisabethae · S. eudoxiana · S. fritschiana · S. haagii · S. hornibrookii · S. irvingii · S. jenkinsii · S. kayei · S. macnabiana · S. ochroleuca · S. patens · S. paulinae · S. petraschii · S. poluanglica · S. pungens · S. stribrnyi · S. urbium · S. zimmeteri · S. 'Ada' · S. 'Aemula' · S. 'Afrodite' · S. 'Agnes' · S. 'Aladdin' · S. 'Alan Hayhurst' · S. 'Alan Martin' · S. 'Alba' · S. 'Albert Einstein' · S. 'Albert Hawkins' · S. 'Albertii' · S. 'Albida' · S. 'Aldebaran' · S. 'Alfons Mucha' · S. 'Allendale Acclaim' · S. 'Allendale Accord' · S. 'Allendale Allure' · S. 'Allendale Amber' · S. 'Allendale Andante' · S. 'Allendale Angel' · S. 'Allendale Argonaut' · S. 'Allendale Ballad' · S. 'Allendale Ballet' · S. 'Allendale Bamby' · S. 'Allendale Banshee' · S. 'Allendale Beau' · S. 'Allendale Beauty' · S. 'Allendale Betty' · S. 'Allendale Billows'

Bibliography

• Hwang Shu-mei, Wei Chao-fen, Lu Ling-ti, Ku Tsue-chih &
• Hwang Shu-mei, Wei Chao-fen, Lu Ling-ti, Ku Tsue-chih & Jin Shu-ying. 1995. Saxifragaceae (2) [Parnassioideae, Hydrangeoideae, Escallonioideae, Iteoideae, Ribesioideae]. In: Lu Ling-ti & Hwang Shu-mei, eds., Fl. Reipubl. Popularis Sin. 35(1): 1-406.
• 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 &
• Pan Jin-tang. 1992. Saxifragaceae (1) [Penthoroideae, Saxifragoideae]. In: Pan Jin-tang, ed., Fl. Reipubl. Popularis Sin. 34(2): 1-309
• Pan Jin-tang. 1992. Saxifragaceae (1) [Penthoroideae, Saxifragoideae]. In: Pan Jin-tang, ed., Fl. Reipubl. Popularis Sin. 34(2): 1-309

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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.
• Global Biodiversity Information Facility. Accessed March 16, 2008. http://www.gbif.org Mediated distribution data from 2 providers.
• The International Plant Names Index. Accessed Jan 19, 2007.

Data Sources:

Accessed through GBIF Data Portal March 16, 2008:

• GBIF-Sweden: Lund Botanical Museum (LD)

Identifiers:

• Global Biodiversity Information Facility Taxonkey: 15841428
• Globally Unique Identifier: urn:lsid:ipni.org:names:794043-1
• Zipcode Zoo Species Identifier: 891319

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.
2. Pan Jintang , Richard Gornall, Hideaki Ohba "Saxifraga". in Flora of China Vol. 8 Page 280. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org.