A. TRIDENTATA. 139 



Tulare County, California, Olancha Mountains and Monache Meadows. Collections 

 (those from Utah and east chiefly of minor variation 7, that is A . spiciformis Osterhout) : 

 Cooper Hill, Albany County, Wyoming, Nelson 8941a (UC); North Park, Colorado, 

 Osterhout 2255 (NY, UC, topotype of A. spiciformis Osterhout, minor variation 7); 

 Minturn to Leadville, Colorado, Hall, 11064, 11055, 11057 (UC); Crested Butte, west 

 central Colorado, Baker 810 (Or, NY, UC, US); Aquarius Plateau, Utah, Ward 593 

 (Gr); head of Pass Canon, Tooele, Utah, August 9, 1913, Blankinship (hb. Blankinship) ; 

 California: east end of Bear Lake, San Bernardino Mountains, Bailey 1244 (UC); type 

 collection, in part, Monache Meadows, at 2,200 meters altitude, September, 1875, 

 Rothrock 298 (Gr, US); type collection, remainder, Olancha Peak, at 2,870 meters alti- 

 tude, September, 1875, Rothrock 343 (Gr, Phila, US); Little Cottonwood Creek, Inyo 

 County, September 6, 1911, California Museum of Vertebrate Zoology (UC); near 

 Soda Creek, southern Sierra Nevada, Purpus 5165 (UC, US); Volcano Meadows, Tulare 

 County, Hall and Babcock 5490 (UC); Soda Springs of the Tuolumne, August 22, 1894, 

 Congdon (UC); Mono Pass, August 13, 1898, Congdon (Gr, UC); Mount Dana, Bolander 

 6018 (UC, US) ; Tioga Pass, Hall 10847 (UC) ; Ebbets Pass, Brewer 1996 (UC) ; Angora 

 Peak, near Tahoe, Smiley 20 (Gr); Bear Valley, on Truckee River, Placer County, 

 September 9, 1888, Sonne (NY, UC, leaves from merely dentate to cleft into lobes up 

 to 10 mm. long) ; Webber Lake, August, 1878, Lemmon (Gr) ; south side of Slide Mountain, 

 Washoe County, Nevada, Heller 10667 (NY); Hurricane Creek, Wallowa Mountains, 

 Oregon, Cusick 2486 (NY, UC, US); Washington, Vasey 480 (NY, type of A. vaseyana 

 Rydberg, minor variation 18); Yakima Region Washington, Brandegee 910 (UC); 

 Ketchum, Blaine County, Idaho, Nelson and Macbride 1190 (UC, US). 



25^. Artemisia tridentata bolanderi (Gray). — Shrub 2 to 6 dm. high, branching 

 to form low bushes with erect densely leafy twigs, not rigid or at all spinose; pubescence 

 white, loose and floccose; leaves mostly narrowly linear and entire but many dilated 

 at apex, where cleft into 3 narrow lobes (see fig. 22d, p. 145), 1 to 2 cm. long or perhaps 

 longer; inflorescence varying from spike-like and less than 1 cm. broad to narrowly 

 paniculate and 3 cm. broad; heads campanulate, 2.5 to 3 mm. broad; involucre loosely 

 white-canescent; flowers 8 to 15; corolla 2 to 2.5 mm. long; achenes granuliferous. 

 (.4. bolanderi Gray, Proc. Am. Acad. 19:50, 1883.) Known only from Mono county, 

 California. Type locality, Mono Pass in the Sierra Nevada. Collections: Type col- 

 lection, Bolander 6149 (Gr, UC, US); Sand Flat, south of Mono Lake, California, 

 Clements and Hall 11702 (UC); between Walker and Mono Lakes, California, August 6, 

 1898, Congdon (DS). 



MINOR VARIATIONS AND SYNONYMS. 



A tabulation of the characters of the subspecies and of most of the following forms is 

 given in table 13. From this it is seen that the taxonomic recognition of all possible 

 combinations of characters would result in a classification too cumbersome for general 

 use. The more important variations not already provided for as subspecies are the 

 following : 



1. Artemisia angusta Rydberg, N. Am. Fl. 34:283, 1916. — Based upon A. IriderUata anguslifolia, which see. 



2. A. ARBUscuLA Nuttall, Trans. Am. Phil. Soc. II, 7:398, 1S41. — A. trideniala arbuscula and A. t. nova. 



3. A. BOLANDERI Gray, Proc. Am. Acad. 19:50, 1883. — A. tridentata bolanderi. 



4. A. NOVA Nelson, Bull. Torr. Club 27:274, 1900.— A. tridentata nova. 



5. A. PARisHi Gray, 1. c. 17:220, 1882. — A. tridentata parishi. 



6. A. ROTHKOCKi Gray, Bot. Calif. 1:618, 1876. — .4. tridentata rothrocki. 



7. A. SPICIFORMIS Osterhout, Bull. Torr. Club 27:507, 1900. — .4. tridentata rothrocki. The original speci- 

 mens, from North Park, Colorado, are more densely cinereous than the originals of rothrocki from the southern 

 Sierra Nevada, and the latter are somewhat viscid. Colorado plants are generally of a decided gray or whitish 

 color, due to the dense pubescence, but in a collection from near Leadville {Hall 11057) the lower leaves are as 



