794 PLANT LIFE OF ALABAMA. 
ALABAMA: Mountain region. Cullman County, growing on gravelly borders of 
fields, with S. mohvii, blooming about two months earlier. May 28, 1895. 
Type locality as just given. 
Herb. Mohr. 
Silphium asteriscus L. Sp. Pl. 2:920. 1753. CoMMON RoSINWEED. 
Ell. Sk. 2:469. Gray, Man. ed. 6, 270, Chap. F1.220. Gray, Syn. Fl. N. A.1, pi. 
2: 241. 
Carolinian and Louisianian 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 
Mohile counties. : ’ 
Type locality: ‘‘ Hab. in Virginia, Carolina.” 
Silphium asteriscus angustatum Gray, Syn. Fl. N. A. ed. 2,1, pt.2: 449. 1886. 
Lonisianian area. Western Florida. 
ALABAMA: Pine region. Grassy open pine woods. Baldwin and Mobile counties. 
Flowers June, July. Not frequent. 
Type locality: ‘“‘Chattahooche, Florida, 4. H. Curtiss.” 
Herb. Geol. Surv. Herb. Mohr. 
Silphium dentatum Ell. Sk. 2: 468. 1821-1824. 
Silphium asteriscus var. scabrum Nutt. Gen, 2: 183. 1818. 
S. asteriscus laevicaule DC. Prodr. 5:512. 1836. 
8. asteriscus var. dentatum Chap. Fl. 221. 1860. 
Ell. Sk.l.c. Gray, Syn. FLN.A.1, pt. 2: 241. Chap. FL ed. 3, 241. 
ALABAMA: Mountain region to Central prairies. Rocky dry woods, open copses. 
Talladega County, Riddell’s Mill. Montgomery County, bald rocky prairies, Pint- 
lalla Creek. Wilcox County (Buckley). Lee County, Auburn (Baker §° 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. Pl. 2: 920. 1753. THREE-LEAF ROSINWEED. 
Silphium ternifolium Michx. ¥]. Bor. Am. 2: 146, 1803. 
Ell. Sk. 2:;466. Gray, Manu. ed. 6,270. Chap. Fl. 220. Gray, Syn. F1.N. A. 1, pt. 
2: 241, 
Carolinian and Louisianian areas. Pennsylvania 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 infreyuent. 
Type locality: ‘Hab. in Virginia.” 
Herb. Geol. Surv. Herl. Mohr. 
Silphium laevigatum Pursh, Fl. Am. Sept. 2: 578. 1814. 
Silphium trifoliatum latifolium Gray, Syn. Fl.N.A.1, pt. 2: 241, 1884. 
Ell, Sk, 2: 465. Gray, Syn. FI. 1. e. 
Carolinian area, Lower South Carolinia and middle Georgia. 
ALABAMA: Mountainregion. 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. integrifolium 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 donbt about its identity with the plant described 
by Elliott under the same name; accordingly Pursh’s name is to be kept np. 
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. Enslen.” 
Herb. Geol. Surv, Herb. Mohr. 
