794 PLANT LIFE OF ALABAMA. 



ALABAMA: Mountain region. Cullnian County, growing- on gravelly borders of 

 fields, with S. mohrii, blooming about two months earlier. May 28, 1895. 

 Type locality as just given. 

 Herb. Mohr. 



Silphium asteriscus L. Sp. PI. 2 : 920. 1753. COMMON ROSINWKKD. 



Ell. Sk. 2 : 469. Gray, Man. ed. 6, 270. Chap. Fl. 220. Gray. Syn. Fl. N. A. 1, i>r. 

 2: 241. 



Carolinian and Lonisianian areas. North Carolina to Florida and Louisiana. 



ALABAMA: Over the State. Dry rocky or gravelly open woods and copses. Clay 

 County, Shinbone Valley, 1,000 feet altitude. Cullman County. Montgomery and 

 Mobile counties. 



Type locality: " Hab. in Virginia, Carolina." 



Silphium asteriscus aiigustatum Gray, Syn. Fl. N. A. ed. 2, 1, pt. 2 : 449. 1886. 



Louisianian area. Western Florida. 



ALABAMA: Pine region. Grassy open pine woods. Baldwin and Mobile counties. 

 Flowers June, July. Not frequent. 



Type locality: " Chattahooche, Florida, A. H. Curtiss." 



Herb. Geol. Surv. Herb. Mohr. 



Silphium dentatum Ell. Sk. 2 : 468. 1821-1824. 

 SUpkwm asteriscus var. scabrum Nutt. Gen. 2 : 183. 1818. 

 S. asteriscus laevicaule DC. Prodr. 5 : 512. 1836. 

 S. astzriscus var. dentatum Chap. Fl. 221. 1860. 

 Ell. Sk. 1. c. Gray, Syn. FJ. N. A. 1, pt. 2 : 241. Chap. Fl. ed. 3, 241. 



ALABAMA: Mountain region to Central prairies. Rocky dry woods, open copsos. 

 Talladega County, Riddell's Mill. Montgomery County,' bald rocky prairies, 1'int- 

 lalla Creek. Wilcox County (Buckley). Lee County, Auburn (Baker f Earle, 283). 



In our specimens the stem is glabrous throughout, the leaves are ovate-lanceolate 

 acute, pilose, scabrous above, softer and paler underneath, thin: the lower opposite 

 on short hirsute petioles, the upper sessile, alternate. Bracts of the involucre 

 smooth, ciliate, the inner broadly ovate; by this character the species becomes 

 widely remote from S. asteriscus, with which it has by most botanists been connected. 



Type locality : "Grows in the western districts of Georgia." 



Herb. Geol. Surv. Herb. Mohr. 



Silphium trifoliatum L. Sp. PI. 2 : 920. 1753. THHEE-LKAF ROSINWKKD. 



Silphium ternifolium Michx. Fl. Bor. Am. 2 : 146. 1803. 

 Ell. Sk. 2 : 466. Gray, Man. ed. 6, 270. Chap. Fl. 220. Gray, Syn. Fl. N. A. 1, pt. 



Carolinian and Louisianian areas. Penns3 T lvaiiia to Ohio, south to Tennessee and 

 upper Georgia. 



ALABAMA: Mountain region to Central prairies. Margins of fields and rich open 

 copses. Clay County, Mount Olive. Cullman County. Montgomery County, Pint- 

 lalla Creek. Blount County, Blount Springs. Flowers, July, August; 5 to 6 feet 

 high. Not infrequent. 



Type locality: "Hab. in Virginia." 



Herb. Geol. Surv. Herb. Mohr. 



Silphium laevigatum Pursh, Fl. Am. Sept. 2 : 578. 1814. 

 Silphium trifoliatum latifoliitm Gray, Syn. Fl. N. A. 1, pt. 2 : 241. 1884. 

 Ell. Sk. 2 : 465. Gray, Syn. Fl. 1. c. 

 Carolinian area. Lower South Carolinia and middle Georgia. 



ALABAMA : Mountain region. Open woods. Walker County, South Lowell. Blount 

 and Cullman counties. Lee County, Auburn (Baker $ Earle, 284). Flowers June to 

 August. Not rare. 



Considering that S. intenrifolium is not found in the lower parts of the Southern 

 States, and that the description of Pursh is founded on Enslen's plant collected in 

 western Georgia, there can be no doubt about its identity with the plant described 

 by Elliott under the same name; accordingly Pursh's name is to be kept up. 



In view of the many doubtful forms which occur in the southern extension of the 

 Allegheny Mountains, and which have been either described as distinct species or 

 considered as varieties and often confounded with one another, it is not without 

 hesitation that the forms regarded as new by the writer are here introduced, espe- 

 cially when confronted by the confusion of the nomenclature of this group. 



Type locality : "In Georgia. Enalen." 



Herb. Geol. Surv. Herb. Mohr. 



