>78 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Synopsis of Species. 



* Petiole-bases connate into conspicuous foliaceous stipule-like appendages; 

 tuberous-rooted perennials, at least the first species. 



-1- Involucral scales subequal; heads solitary, long-pedunculate, terminating 



the branches. 



1. S. CALVA (Gray & Engelm.) Gray. Erect, much branched, 

 from a thick woody tuberhke root, harsh with white bristle-hke hairs 

 with swollen bases intermixed with a fine puberulence, the stem and 

 branches striate-groo ved ; leaves opposite usually to tips of the 

 branches, very harsh with a double pubescence like that of stem, 

 lance-deltoid in outline, acute at apex, somewhat cordate at base, 

 crenate-dentate, unlobed or hastately eared or deeply trilobed, 3-5 

 cm. long, 1.5-4 cm. wide, on short margined petioles 7-12 mm. long, 

 their bases united into broad entu-e or lobed foliaceous disks; heads 

 solitary on long naked peduncles terminating the branches, the disk 

 1-2.2 cm. wide; involucre 7-9 mm. high, the scales linear-lanceolate 

 to linear-oblong, in about 3 rows, subequal or the outer series slightly 

 shorter, densely hispid and covered with a fine puberulence, somewhat 

 green-nerved; rays 20-30, yellow, somewhat livid without, oval, 

 8 mm. long, pubescent on tube and nerves of back; disk-corollas 

 yellow, becoming purplish upwardly, puberulent, 6.5 mm. long, the 

 tube very short; pales 8 mm. long, puberulent on back and sub- 

 herbaceous tip; achene glabrous, emarginate, awnless, mottled with 

 black and gray, 4.5 mm. long, 2.5 mm. broad. 



BarraUia calva Gray & Engelm. Am. Journ. Sci. ser. 2. iii. 275 

 (1847). 



Simsia calm Gray, PI. Lindh. ii. 228 (1850). 



Encclia (Barrattia) calva Gray, Proc. Am. Acad. viii. 658 (1873). 



Specimens examined: Texas: rocky bluff's, Baird, Apr. 1882, 

 Reverchon (N) ; rocky terraces of limestone hills, under stunted live 

 oaks, Comanche Spring, June 1849, Lindhcimer 60 (G); Comanche 

 Spring, June 1849, Lmdheimer 900 (FGN); Brazos, Sutton Hayes 

 47 part (F) ; dry hills, local, Austin, 22 Oct. 1891, J. E. Bodin 192 (N) ; 

 rocky soil, in open woods between the headwaters of the Guadalupe 

 and Pedernales Rivers, Oct. 1845, Lindheimer 432 (G, type) ; top of 

 dry hills, Pedernales, 1847, Lindheimer 39 (G) ; summit of rocky hills. 

 Upper Guadalupe, 1846, Lindheimer 142 (G) [?= Lindheimer III 433: 

 GNJ; San Antonio, 28 July 1882, Letterman 5 (N); common in 

 woods, San Antonio, 18 Sept. 1901, Bush 837 (N); Spring Creek, 

 Gillespie Co., G. Jcrmy (F); Kerrville, alt. 487-610 m., June 1894, 



