568 



SAXIFRAGACE^E. 



[Perigvnous Exoge.ns. 



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

 monopetalous Primworts. . 



Little herbaceous plants, usually with 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 forming the chief beauty of that rich turf which is found near the snow m 

 high Alpine 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 amencana is 

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

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

 have been derived from then- name rather than their virtues. Some pretend that 

 Saxifra^a crassifolia may be used as a substitute for Tea ; and Chrysosplenium alterm- 

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

 exudation of a few of them is acrid. 



GENERA. 



Eremosytie, Endl. 

 Donatia, Forst. 

 Vahlia, Tkunb. 



Russelia, Linn.f. 



Bistella, Dtl. 

 Nimmoia, Wight. 

 Boykinia. Null. 

 Zahlbrucknera,.Re«A/'n6. 



Oreotplenium , Zahlbr. 

 Saxifraga, Linn. 



Porphyrion, Tausch. 



Antiphylla, Haw. 



Caliphyllum, Gaud. 



Aizoonia, Tausch. 



Chondrosea, Haw. 



Cotyledon, Gaud. 



Trigonophyllum, Gaud, 



Porophyllum, Gaud. 

 Dactyloides, Tausch. 

 Saxifraga, I law. 

 Muscaria. Haw 

 Triplinervium, Gaud. 

 Bergenia, Moneh. 

 Megasea, Haw. 

 Geryonia, Schrank. 

 Eropheron, Tausch. 

 Micranthes, Tausch. 

 Dermasea, Haw. 

 Arabidia, Tausch. 

 Spathularia, J law. 

 Hydatica. Neck. 

 Robertsonia, Haw. 

 Aulaxis, Haw. 

 Diptera, Borkh. 



Ligularia, Duval. 



Micropetalum, Tausch. 



Cotylea, Haw. 



Lobaria, Haw. 



Hirculus, Tausch. 



Kingstonia, Gray. 



Ciliaria, Haw. 



Leptasea, Haw. 

 Leptarrhena, R. Br. 

 Lutkea, Bung. 



Eriogyne, Hook. 

 Lepuropetalum, Ell. 



Cryptopetalum , Hook. 

 Chrysosplenium, Tourn. 

 Heuchera, Linn. 



Holochloa, Nutt. 



Heucherella, Torr. et 

 A. Gr. 

 Tolmiea, Torr. et A. Gr. 

 Mitellopsis, Meisn. 



Drummondia, DC. 

 Mitella, Tournef. 

 Tellima, R. Br. 



Lithophragma, Nutt. 



Lithophragnwlla,TorT. 

 Sullivantia, Torr. 

 Tiarella, Linn. 



Blondia, Neck. 



Anthonema, Nutt. 

 Astilbe, Hamilt. 



Hoteia, Morr. et Dec. 

 Oresitrophe, Bung. 



Numbers. Gen. 19. Sp. 310. 



Position. — Cunoniaceae. 



CrasmlacecB. 

 Rosacea. 

 -Saxifragace.e. — Lythracese. 

 Grossttlacea. 



i 



