SAXIFRAGE FAMILY. 533 



ALABAMA: Mountain region. Wet sandstone rocks. Walker County (T. M. 

 Peters}. Flowers white. Rare. Perennial. 



Type locality : " Hab. in Carolina septentriouali, loco dicto Flat-rock." 

 Herb. Geol. Surv. Herb. Mohr. 



TILLAEA L. Sp. PI. 1 : 128. 1753. TILLAEA. 

 Cosmopolitan genus of about 20 species. North America, 4. 



Tillaea aquatica L. Sp. PI. 1 : 128. 1753. PIGMY- WEED. 



Tillaea simplex Nutt. Journ. Acad. Phila. 1 : 114. 1817. 

 Gray, Man. ed. 6, 177. Chap. Fl. Suppl. 622 ; ed. 3, 150. 



EUROPE. 



Allegheuian to Lonisianian area. Southeastern Massachusetts to Maryland and 

 southeastern Pennsylvania. 



ALABAMA: Coast plain. Low wet pine barrens, border of ponds. Mobile. March; 

 rare. Annual. 



Type locality: "Hab. in Europae inundatis." 



Herb. Geol. Surv. Herb. Mohr. 



PENTHORUM L. Sp. PI. 1 : 432. 1 753. 



Two species. China, North America. 

 Penthorum sedoides L. Sp. PI. 1 : 432. 1753. DITCH STONECROP. 



Ell. Sk. 1 : 528. Gray, Man. ed. 6, 176. Chap. Fl. 151. 



CHINA, JAPAN. 



Allegheuian to Louisianian area. New Brunswick, Quebec, Ontario ; New England 

 west to Minnesota, Nebraska, and Kansas, south to Texas and Florida. 



ALABAMA : Tennessee Valley to Coast Pine belt. Wet woods. Tuscaloosa County. 

 Clarke County, Choctaw Corner; most southern station. Common. Perennial. 



Type locality : " Hab. in Virginia." 



Herb. Geol. Surv. Herb. Mohr. 



SAXIFRAGACEAE. Saxifrage Family. 



THEROFON Raf. New Fl. N. A. 4 : 66. 1836. 

 (BoYKiNiA Nutt. Journ. Acad. Phila. 7: 113. 1834. Not Raf.) 



Therofon aconitifolium (Nutt. ) Millsp. Bull. W. Va. Agr. Exp. Sta. 2 : 361. 1892. 



tioykinia aconitifolia Nutt. Journ. Acad. Phila. 7 : 113. 1834. 



Gray, Man. ed. 6, 170. Chap. Fl. 153. 



Carolinian area. Mountains of southern Virginia along the mountains to Georgia. 



ALABAMA: Mountain region. Damp rocky banks of streams. Dekalb County, 

 banks of Little River, 1,800 feet. Walker County, wet rocks on Clear Creek Falls. 

 Flowers white; June, July. Rare. Perennial. 



Type locality: "In the valleys of the Alleghany Mountains, probably in Virginia 

 or North Carolina. * * * In Muhlenberg's herbarium." 



Herb. Geol. Surv. Herb. Mohr. 



SAXIFRAGA L. Sp. PI. 1 : 398. 1753. 



Two hundred species, chiefly perennials, mostly mountainous, alpine, North and 

 South Hemisphere, Europe, South America. North America, 45. 

 Saxifraga virginiensis Michx. Fl. Bor. Am. 1: 269. 1803. 



Ell. Sk. 1:511. Gray, Man. ed. 6, 170. Chap. Fl. 153. 



Canadian zone to Carolinian area. New Brunswick west to the Pacific. New 

 England (Mount Desert Island, Maine) west to Michigan, West Virginia, Ohio, and 

 Kentucky, south along the mountains to Georgia. 



ALABAMA: Tennessee Valley to Lower hills. Shaded rocky banks. Frequent 

 throughout the mountains. Winston County, 1,500 feet. Dekalb County, Lookout 

 Mountain. Tuscaloosa County, 300 to 400 feet; most southerly station. Flowers 

 yellow; March, April. 



Type locality : "Hab. in rupibus Pensylvaniae, Virginiae et in montibus Carolinae." 



Herb. Geol. Surv. Herb. Mohr. 



