oQS 



SAXIFRAGACE^. 



[Perigynous Exogens. 



equal in number to the petals and opposite them, thus indicating some analogy with the 

 monopetalous Primworts. 



Little herbaceous plants, usually %\dth white flowers, csespitose leaves and glandular 

 stems : some of the species have yellow flowers, others have red, but none blue. They 

 are natives of mountainous tracts in Europe and the northern parts of the world, 

 frequently fonning the chief beauty of that rich turf which is foimd neai* the snow in 

 high Alpme stations. Some grow on rocks and old walls, and in hedgerows, or near 

 rivulets, or in groves. None are produced in tropical countries. 



The whole Order is more or less astringent. The root of Heuchera americana is 

 powerfully so, whence it is called in North America Alum-root. Otherwise the species 

 possess no known properties ; for the old idea of theu' being lithontriptic appears to 

 have been derived from their name rather than their vii'tues. Some pretend that 

 Saxifraga crassifolia may be used as a substitute for Tea ; and Chrysosplenium alterni- 

 folium has had some small reputation, in former days, as a shght tonic. The glutinous 

 exudation of a few of them is acrid. 



GENERA. 



EremosjTie, Etidl. 



Donatia, Forst. 



Vahlia, Thunb. 

 Russelia, Linn, f. 

 Bistella, Del. 



Tsimmoia, Wight, 



Boj'kinia, Nutt. 



Zahlbrucknera, Reichenb. 

 Oreosplenium , Zahlbr, 



Saxifraga, Linn. 

 Porphyrion, Tausch, 

 Antiphylla, Haw. 

 Caliphyllum, Gaud, 

 Aizoonia, Tausch. 

 Chondrosea, Haw, 

 Cotyledon, Gaud, 

 Trigonophyllum , Gaud. 



Porophyllum, Gaud. 

 Dactyloides, Tausdi. 

 Saxifraga, Haw. 

 Muscaria, Haw. 

 Triplinervium, Gaud. 

 Bergenia, Monch. 

 Megasea, Haw. 

 Geryonia, Schrank. 

 Eropheron, Tausch. 

 Micranthes, Tausch, 

 Dermasea, Haw. 

 Ardbidia, Tausch, 

 Spathidaria, Haw, 

 Hydatica, Neck, 

 Rdbertsonia, Haw. 

 Aulaxis, Haw. 

 Diptera, Borkh. 



Ligularia, Duval, 



Micropetalum , Tausch. 



Cotylea, Haw. 



Lobaria, Haw. 



Hirculus, Tausch. 



Kingstonia, Gray. 



Ciliaria, Haw. 



Leptasea, Haw. 

 Leptarrhena, R. Br. 

 Liitkea, Bong. 



Eriogyne, Hook. 

 Lepuropetalum, Ell. 



Cryptopetalum , Hook. 

 Chrj-sosplenium, Tourn, 

 Heuchera, Linn. 



Holochloa, Nutt. 



Heucherella, Torr. et 

 A. Gr. 

 Tolmiea, Torr. et A. &r. 

 Mitellopsis, Meisn. 



Drummondia, DC. 

 Mitella, Tournef. 

 Tellima, R. Br. 



Lithophragma, Nutt. 



Lithophragmella,ToTr. 

 Sullivantia, Torr. 

 Tiarella, Linn. 



Blondia, Neck. 



Anthonema, Nutt. 

 Astilbe, Hamilt. 



Hotela, Morr. et Dec. 

 Oresitrophe, Bung. 



Position. — Cunoniacese.- 



NuMBERS. Gen. 19. Sp. 310, 



Crassulacece. 

 RosacecB. 



-SAXIFRAGACEiE.— 



GrosmlacecB. 



-Lythracese. 



