Gleason : The pedunculate species of Trillium 



395 



16. Trillium ovatum Pursh, Fl. Am. Sept. 245. 



1814 



Trillium californicum Kellogg, Proc. Calif. Acad. 2 : 50. 



1863. 



Trillium crassifolium Piper, Erythea 7: 104. 

 Type locality: The Columbia River. 



1899. 



Distribution : British Columbia to Montana, Colorado, and 



California. 



The three preceding species constitute a very well-marked nat- 

 ural group closely resembling each other in habit and flower-struc- 

 ture. In the western species the stigmas are usually somewhat 



spreading, while in 



difli 



connivent. The latter is separated also by its geographical distri- 

 bution. Aside from these the only reliable characters are found 

 in the length of the filaments and anthers. Measurements of a 

 series of herbarium specimens give the following results : 



Species. 



Filaments. 



• 



Anthers. 



Maximum. 



Mean. 



Minimum. 



Maximum. | Mean. 



Minimum. 



T. Scou/eri 



T. grandiflorum ... 



9 



11 



5 



6.4 



9-1 

 4.4 



s 



6 

 4 



15 



7 



IO.8 

 IO.4 



6.4 



8 

 8 



5 





T crassifolium Piper is founded on a small form of T ovatum 

 with thickish, shining, broadly ovate, closely sessile leaves. It 

 has no definite morphological character to separate it from Pursh's 



species. 



1803 



17. Trillium pusillum Michx. Fl. Bor. Am. 1: 215. 



Trillium pumilum Pursh, Fl. Am. Sept. 245. 1 8 14. 



Trillium texanum Buckl. Proc. Acad. Philad. i860 : 443. 1861. 



Type locality : South Carolina. 



Distribution : Pine barrens of the southern Atlantic States. 

 The species is little known and very poorly represented in Ameri- 

 can herbaria. 



18. Trillium Cateshaei Ell. Sk. i: 429 



1817 



Trillium ccrnuum L. Sp. PI. 339, in part. 

 Trillium nervosum Ell. Sk. I : 429. 1817. 

 Trillium stylosum Nutt. Gen. I : 239. 1818. 



1753 



