30 Contributions from the Gray Herbarium 
should be broadened to include O. celosioides and the next, thus 
more nearly conforming to Gray’s interpretation (Syn. Fi. 1. ¢.). 
Undoubtedly the group is the most complex in the genus and dis- 
tinctive characters of fruit, so obvious in other groups, here, 
strangely enough, seem to be mostly lacking. 
12. 0. ees phere Pitt. iii. 110 (1896). O. Mere Blank- 
inship, Mont. . Coll. Sci. Studies, Bot. i. 96 (1905). — 
Southern rine — Birds Eye, Fremont Co., June 24 and June 
10, 1910, Aven N elson, nos. 9355 & 9411; Fort Steele, Carbon Co., 
June 16, 1900 & 1907, Aven roma: nos. 7428 & 9045; Greene 
River, June 14, 1898, Aven N elson, no. 4715; Rock River, Albany 
Co., June 18, 1901, nes Salt Cr eke; Nats Co., July 9, 1901, 
Goodding, nos. 29 & 2 
This species is sa a Eenical development on the red clay hills 
of southeastern Wyoming. Dr. Nelson has observed that it blooms 
about a month earlier than O. glomerata which, about Laramie, at 
least, persists for two years, or possibly longer, and belongs to the 
grassy foothills. O. affinis, however, becomes perennial westward, 
and this fact makes it very difficult to distinguish in the herbarium 
some forms from O. glomerata. In general, however, the latter is a 
larger coarser plant restricted to a more northerly and more eastern 
range. The perennial state of O. affinis has been named var. peren- 
nis A. Nels., Eryth. vii. 67 (1899), i. e. O. perennis (A. Nels.) Rydb., 
Bull. Torr. Club xxxiii. 150 (1906). 
13. O. Macounn Eastw. ex Rydb. Bull. Torr. Club xl. 480 
(1913). —SaskaTcHEwaNn: 1858, Bourgeau. Also ‘ Carlton 
House,” presumably by Dr. Richardson 
14. O. ARGENTEA Rydb. Bull. Torr. Club xxxi. 637 (1905). — 
Northwestern Colorado. — Hayden, Routt Co., July 10, 1913, 
Osterhout, no. 4940 (R. Mt. Herb. 
. SPICULIFERA Piper, Contrib. U.S. Nat. Herb. xi. 481 | 
15. 
(1906). _O. cilio-hirsuta Nels. & Macbr. Bot. Gaz. lv. 378 (1913). — 
Eastern Washington to southwestern Idaho. — Inano: Minido 
Lincoln Co., June 23, 1912, Nelson & Macbride, no. 1799; Boise- 
Payette Project, Canyon Co., June 2, 1911, M acbride, no. 875. 
 sferamneiring ot Ritzville, Adams Co., June 6, 1893, Sandberg & 
Leiberg, no. 
16. O. ste (Gray) Greene, Pitt, i. 58 (1887). Kren 
ets Proc. Am. Acad. xx. 279 (1885). priiewlenigonte glomer: 
paleyy Pursh) DC., var. humile pets l. ec. x. 61 (1875) and Syn. Fl. 
ii. pt. 1. 196 (1878), i in part. — Montana to Utah. as 
Bridger’s Pass, 1856, Her enry Engelmann. Wvyominc: Mammoth 
Hot Springs, Yellowstone Park, June 1885, rests no. 816. 
