326 THE JOURNAL OF BOTANY 



orbicular leaves, generally shortly acute or subacute, with 3-5 con- 

 spicuous nerves. The lanceolate to oblanceolate petals (4-6 cm. by 

 •7-1*4 cm.) exceed the lanceolate sepals (3-4-5 cm. by '8-1 cm.), 

 and are 3-4 times longer than the stamens. The connective is 

 scarcely prolonged above the anther, and the stigmas are short. 

 It embraces several of Rugel's gatherings in the mountains of 

 East Tennessee (above warm springs, &c.), and one from the 

 Alleghany Mountains in North Carolina. It may perhaps be 

 T. rotundifoJium Raf. /. c. 97. 



The Western specimens as indicated by Watson (Proc. Am. 

 Acad. xiv. 273) fall into two sets : — 



(1) A robust plant with large broadly rhombic-ovate sessile 

 leaves (in our specimens reaching 10 cm. long and nearly as broad), 

 and oblanceolate to rhombic-obovate petals (5*5-6 cm. long by 

 1*1-2*6 cm. broad) considerably exceeding the lanceolate sepals, 

 and 3-3| times as long as the stamens (filaments about 2 mm. long, 

 anthers 1*5 cm. excluding the prolonged connective, 1 mm.) ; 

 stigmas short (4 mm. long). 



This is the var. californicum Watson, /. c, and the \Sbi\ giganteiim 

 Torr. in Pacif. Rail. Rep. 4, 151, uon Hook., also Greene, Man. 

 Bay-Region Bot. 314. 



The larger specimens of the Tennessee form approach this, but 

 show less difference between size of sepals and petals. 



Watson includes here var. chloropetahim Torr. /. c, characterized 

 by its green obovate elliptical obtuse petals, twice the length of the 

 sepals. Greene, /. c. follows Torrey, and recognizes it as distinct. 



(2) Similar to (1), but with shortly petiolate leaves, and the 

 oblanceolate petals narrower, especially towards the base. In the 

 specimens which I have examined the stigmas are larger than 

 in (1), 6-5-7 mm., and straight. 



This is the var. cfiganteum Hook. & Arn. Bot. Beechey, 402 

 (1841) = var. angjistlpetaJum Torr. in Pacif. Rail. Rep. 4, 95 [151] , 

 (1857). I have received cultivated specimens from Messrs. Perry, 

 of Winchmore Hill, as "2". sessile var. rubrum." 



Specimens in cultivation which I have received from various 

 sources as var. californicum resemble rather the robuster forms 

 from the Atlantic side. 



2. T. DiscoLOK Wray ex Hook, in Bot. Mag. t. 3097 (1831). 



T. sessile var. Wrayi Watson in Proc. Amer. Acad. xiv. 273 (1879). 



This seems to be a distinct species, and is so regarded by Small 

 (I. c. 171). It is characterized by its sulphur-yellow to green, very 

 obtuse obovate petals narrowing to a claw at the base. 



3. T. viRiDE Beck in Amer. Journ. Sci. xi. 178 (1826) ; Kunth, 

 Enum. V. 123 (1850); Small, I.e. 173. 



T. viridescens Nutt. in Trans. Amer. Phil. Soc. xv. (new ser.) 



155 (1837). 

 T. sessile var. Nuttallii Watson in Proc. Amer. Acad. xiv. 273 



(1879). 

 This seems a good species as indicated by Dr. Small, who also 

 pointed out the identity of the plants of Beck and Nuttall. 



