324 GENUS ATRIPLEX. 



following subspecies occurs, all represented by specimens in the Rocky Mountain Her- 

 barium of the University of Wyoming, are Walhalla, in North Dakota; northwestern 

 and eastern Harding County, in South Dakota; Laramie, Point of Rocks, Sweetwater 

 River, Big and Little Laramie Rivers, Granger, Poison Spider Creek, Buffalo, Howell 

 Lakes, Seven-mile Lakes, Red Desert, Steamboat Lake, Wamsutter, Leucite Hills, 

 North Fork Vermillion Creek, and Carter (Uinta County) in Wyoming; Montrose in 

 Colorado; Mendon (Cache County) and Cannonville in Utah; and Clyde (Blaine 

 County) and Falks (Canon County) in Idaho. 



386. Atriplex nuttalli tridentata (Kuntze). Stems strictly erect from a com- 

 pact base, the decumbent portion short and the plants therefore narrow; leaves 

 oblong or linear-oblong, obtuse, 2.5 to 5 cm. long, 0.3 to 0.8 cm. wide, narrowed to a 

 subsessile base; fruiting bracts orbicular-ovate, with a shortly cuneate base, broadest 

 below the middle, sessile, 4 to 5 mm. long, broad-margined, with usually 3 prominent 

 and several smaller teeth at summit, the middle tooth often the largest, the sides smooth 

 or rarely with a few small tubercles. (A. tridentata Kuntze, Rev. Gen. PI., 546, 1891.) 

 Wyoming, northern Colorado, and Utah. Type locality, near Corinne, Utah. Col- 

 lections: Sweetwater County, Wyoming, Nelson 3667 (Gr); Point of Rocks, Wyoming, 

 Nelson 44^9 (Gr, R, type collection' of A. pabularis Nelson, minor variation 15); 

 Granger, Hams Fork, Wyoming, Nelson S89S (NY, US); Uinta County, Wyoming, 

 Goodding 1179 (Gr, form approaching minor variation 4, A. eremicola Osterhout). 



38c. Atriplex nuttalli gardneri (Moquin). — Stems erect from a woody branch- 

 ing base; leaves narrowly oblong or oblanceolate, obtuse, 1.5 to 4 cm. long, 0.3 to 1 

 cm. wide, tapering to a short petiole; fruiting bracts oblong with a cuneate base or 

 narrowly obovate, broadest above the middle, sessile, 4 to 6 mm. long, with several prom- 

 inent teeth across the summit, the middle tooth usually the largest, the sides smooth or 

 with a few tubercles. {Obione gardneri Moquin, in DeCandolle, Prodr. 13-: 114, 1849.) 

 Alkaline plains and slopes of southern Wyoming, northern Colorado, and southern Idaho. 

 Type locality, along the Platte River. Collections: Type collection. La Platte River, 

 Gordon (Gr) ; Laramie River, Wyoming, Nelson 81 74 (Gr) ; Big Laramie River, Wyoming, 

 E. Nelson 786 (Gr); 8 km. east of Medicine Bow, Wyoming, September 10, 1919, Hall 

 (CI, a broad-leaved form); Steamboat Lake, southern Wyoming, July 21, 1898, Osterhout 

 (Gr); southern Wyoming, July, 1896, Osterhout (Herb. Osterhout, type of A. eremicola 

 Osterhout, minor variation 4) ; Howell Lakes, Albany County, Wyoming, E. Nelson 446S 

 (NY, same variation); Howell Lakes, Wyoming, A. and E. Nelson 6910 (Gr, bracts partly 

 typical, see fig. 46); Point of Rocks, Wyoming, Hall 10935 (UC, see note under minor 

 variation 15); between Strevell and Albion, Idaho, September 17, 1919, Hall (UC). 



38d. Atriplex nuttalli cuneata (Nelson).— Stems erect from a decumbent, decid- 

 edly woody, much branched base; leaves broadly elliptic, very obtuse, 2 to 6 cm. long 

 including the petiole or rarely only 1.2 cm. long and sessile, 0.6 to 2.5 cm. wide, 

 cuneately narrowed to a short petiole or base; fruiting bracts globoid in outline or slightly 

 elongated, sessile or short-stalked, 5 to 7 mm. long, irregularly toothed at summit, the 

 sides with numerous conspicuous crest-like appendages, these commonly more or less 

 flattened (fig. 45, a, b.). {A. cuneato Nelson, Bot. Gaz. 34:357, 1902.) Southwestern 

 Colorado, northern New Mexico, northern Arizona, and southern Utah. Type locality, 

 Emery, Utah. Collections: Alkaline plains at Mesa Grande, along the Gunnison River, 

 Colorado, Pur-pus 82, 209 (UC) ; Grand Junction, Colorado, common on alkaline plateaus, 

 Hall 11048 (UC); San Juan Plains, southwestern Colorado, Brandegee 1086, in part 



' Nelson's 4429 is labeled as the type in the Rocky Mountain Herbarium and his 3712, from the same locality, is there 

 indicated as a cotype. The latter number is cited 6rst in connection with the original description. Both collections are of 

 the pabularis form. 



