1922] 



PAYSON — STUDY OF THELYPODIUM AND ITS IMMEDIATE ALLIES 281 



Bot. Gard. Herb.) ; along the Sevier River, above Marysvale, July 

 19, 1905, Rydberg & Carlton 6926 (Rky. Mt. Herb.). 



The group of specimens here cited is more or less polymorphic 

 but it is believed that further taxonomic segregation would be 

 of no advantage. Color differences are difficult of detection in 

 the herbarium, and there is every reason to believe that the colors 

 are quite variable in the field although some geographic localiza- 

 tion of color forms certainly occurs. In Colorado, for example, 

 the form on the eastern slope of the Continental Divide is mostly 

 white-flowered and on the western slope mostly purple. This 

 purple form of western Colorado is the typical lilacinum of 

 Greene. In Utah white-flowered plants seem to predominate, 

 while in southern Idaho the purple-flowered form again appears. 



14a. Var. subumbellatum Payson, n. var. 1 



Thelypodium integrij olium Robinson in Gray, Syn. Fl. N. Am. 

 I 1 : 176. 1895, in part; Rydb. Mem. N. Y. Bot. Gard. 1: 172. 

 1900; Nelson in Coulter & Nelson, Manual Cent. Rocky Moun- 

 tains, 209. 1909, in part. 



Pleurophragma integrij olium Rydb. Fl. Rocky Mountains, 368. 



1917, in part. 



Radical leaves oblanceolate, 8-15 cm. long, 1.5-2.5 cm. broad, 

 narrowed to a broad petiole : nectar glands low and rounded : ma- 

 ture inflorescence congested, subumbellate, 2-3 cm. long; pedi- 

 cels slender, terete: stipes 0.5-1 mm. long. 



Distribution: southwestern Montana, western Wyoming, 

 southern Idaho, Utah. 



Specimens examined: 



Montana: Prickly Pear, July 15, 1898, E. N. B. (Univ. Calif. 

 Herb.); Helena, 1887, Kelsey 257 (Univ. Calif. Herb.); Deep 

 Creek near Anaconda, Aug. 24, 1905, Jones (Mo. Bot. Gard. 

 Herb.); alkali flats, Three Forks, Aug. 10, 1899, Blankinship 

 (Mo. Bot. Gard. Herb.). 



Wyoming: near Mammoth Hot Springs, Yellowstone Nat. 

 Park, Aug., 1893, Burglehaus (Mo. Bot. Gard. Herb., type, and 

 Rky. Mt. Herb.); Mammoth Hot Springs, July 2, 1899, Nelson 

 & Nelson 6034 (Rky. Mt. Herb, and Mo. Bot. Gard. Herb.) ; 

 Mammoth Hot Springs, July 8, 1900, Jones (Univ. Calif. Herb.) ; 



1 TheIypodium lilacinum Greene, var. subumbellatum var. nov., bienne 

 glabrum; foliis radicalibus oblanceolatis 8-15 cm. longis 1.5-2.5 cm. latis; race- 

 mis fructiferis densis subumbellatis; pedicellis graeilibus teretibus. — Collected bj 

 F. H. Burglehaus near Mammoth Hot Springs, Yellowstone National Park, Wyo- 

 ming, Aug., 1893. (Mo. Bot. Gard. Herb., type). 



