SAXIFRAGACEAE. 171 



Hypanthium well developed and accrescent, at maturity longer than the sepals. 

 Stamens 5 ; sepals imbricated ; petals marcescent. 6. Sullivantia. 



Stamens 10; petals not marcescent. 



Petals clawed ; styles partially united ; plants with thick rootstocks. 



7. Telesonix. 

 Petals clawless ; styles distinct ; plants with slender rootstocks or with 

 offsets. 

 Plants without caudices, only producing annual flowering stems. 



^ 8. Saxifraga. 

 Plants with perennial, very leafy caudices, often with offsets ; the flow- 

 ering stems very different. 9. Muscaria. 

 Hypanthium only slightly developed, unchanged at maturity, or if slightly 

 accrescent flat and plants acaulescent. 

 Plants acaulescent. 



Corolla essentially regular, the petals about equal in shape and length. 



10. Micranthes. 

 Corolla irregular, 3 petals with blades of an ovate or lanceolate type and 

 2 narrower and longer. 11. Spatularia. 



Plants caulescent. 12. Leptasea. 



I. CHRYSOSPLENIUM L. Golden Saxifrage. 



I. Chrysosplenium tetrandrum Fries. In wet places from Greenl. and 

 Alaska to Alb. and B. C. ; also in Colo, and northern Europe. — Upper Platte 

 (Hall & Harbour). 



2. LITHOPHRAGMA Nutt. 



Hypanthium campanulate, with a rounded base, adnate only to the base of the 

 ovary. 

 Stem-leaves rarely bulbiferous in the axils ; stipules long and narrow ; free por- 

 tion triangular or lanceolate, not fimbriate. i. L. australis. 

 Stem-leaves usually bulbiferous in the axils ; stipules short and broad ; free por- 

 tion round and fimbriate. 2. L. bulbifera. 

 Hypanthium turbinate or obconic, adnate to the lower half of the ovary. 



3. L. parviiiora. 



1. Lithophragma australis Rydb. In sandy mountain valleys and hillsides 

 from Wyo. and Utah to N. M. and Ariz. — Alt. 7000-9000 ft. — Platte Caiion ; 

 headwaters of Sangre de Cristo Creek; Van Boxle's ranch, above Cimarron. 



2. Lithophragma bulbifera Rydb. (Tellima tenella S. Wats.) On hillsides 

 from the Black Hills of S. D., Mont, and B. C. to Colo, and Calif.— Alt. up 

 to 11,000 ft. — Tennessee Pass. 



3. Lithophragma parviflora (Hook.) Nutt. (Tellima parvMora Hook.) In 

 rocky and gravelly places from Alb. to B. C, Colo, and Calif. — Locality not 

 given. 



3. PECTIANTHIA Raf. Mitre-wort. 



I. Pectianthia pentandra (Hook) Rydb. {Mitella pentandra Hook.) In 

 springy places in the woods and along streams, from Alb. and Alaska to 

 Colo, and Calif. — Alt. 8000-12,000 ft. — Beaver Creek; Marshall Pass; Red 

 Mountain; Slide Rock Cafion; Empire; Estes Park; Berthoud Pass; Cam- 

 eron Pass; Ruby; Damfino Creek; headwaters of Clear Creek and alpine 

 ridges east of Middle Park ; Empire ; Caribou ; Golden. 



