176 Proceedings of the Biological Society of Washington. 



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Type in the U. S. National Herbarium, no. 326737, collected at Green 

 River, Utah, altitude 1370 meters, June 22, 1894, by M . E. Jones (no. 

 5482 1). 



Bahia nudicaulis A. Gray, the only close relative of B. ourole-pis, is dis- 

 tinguished by its stipitate'-glandular as well as puberulous stem, the longer 

 hairs of its leaves, and its much broader, oval to elliptic-obovate, densely 

 stipitate-glandular, obtuse to acuminate, not caudate-tipped phyllaries. 

 The type of B. ourolepis was distributed as Bahia desertorurn M. E. Jones, 

 but the type collection of that species in the National Herbarium is identi- 

 cal with B. ihtegrifolia. 



Bahia ouro'epis belongs in the group of Bahia raised to generic rank as 

 Platyschkuhria by Rydberg. The group has a characteristic aspect, but, 

 as is the case with Rydberg's other segregates from Bahia (Picradeniopsis 

 and Amauriopsis), the characters employed for separation do not seem to 

 be of generic value. The whole group is much better retained in Gray's 

 sense as a single genus with several sections, distinguished by habital 

 features, by the proportions of the disk corollas, and, in the case of Amauri- 

 opsis, by the absence of pappus. 



Tetradymia comosa tetrameres Blake, subspi nov. 



Closely similar to T. comosa in habit and foliage; fascicles of linear gla- 

 brate secondary leaves, about 1 to 1.5 cm. long, often present; involucre 

 7 to 10 mm. long, its phyllaries 4 or rarely 5, often more narrowly oblong 

 than in the typical form; flowers 4 or sometimes 5. 



Type in the United States National Herbarium, no. 1066206, collected 

 at Corey Canon, Wassuk Mountains, southwestern Nevada, altitude 1600 

 meters, June 27, 1919, by Ivar Tidestrom (no. 10072). 



Additional specimens examined: Nevada: Winnemucca, Humboldt 

 County, July, 1901, Griffiths & Morris 42, 95; in 1898, V. Bailey. Wads- 

 worth, Washoe County, 1902, Griffiths & Hunter 550; in 1919, Tidestrom 

 10684. Western Nevada, 1875, Lemmon. 



In typical Tetradymia comosa A. Gray, which occurs chiefly in southern 

 California, the phyllaries are 5 or 6, and the flowers 6 to 9. It is possible 

 that most if not all of the localities for T. comosa in the southern Sierra 

 Nevada, Coso, and Panamint Mountains of California given in Coville's 

 "Botany of the Death Valley Expedition" (Contr. U. S. Nat. Herb. 4: 141. 

 1893) relate to T. comosa tetrameres, but no material was preserved. The 

 only material of true T. comosa seen from Nevada is a sheet (herb. N. Y. 

 Bot. Gard.) collected in hills near Reno, altitude 1435 m., June 20, 1900, by 

 S. G. Stokes. 



The specimen in the Gray Herbarium collected by Lemmon was cited 

 first in the description of the species. It is not to be taken as the type, how- 

 ever, both because it is merely a specimen in young bud, from which the 

 characters could not have been drawn, and because the species was referred 

 by Gray to the Section Lagothamnus, the chief character of which is the 

 possession of a 5 to 9-flowered involucre of 5 or 6 phyllaries. There is in 

 the National Herbarium a specimen in bud collected by Lemmon in 1876 



