536 COMPOSITAE (COMPOSITE FAMILY) 



10. Antennaria scariosa E. Nels. Bot. Gaz. 27: 211. 1899. Caespitose, 

 lightly hoary-tomentose throughout; stems 3-6 cm. high; stolons short, at 

 most 4 cm. long: leaves 1.4 cm. long or less, spatulate, obtuse or acutish, in- 

 clined to be conduplicate ; cauline leaves rather ample, oblanceolate to nar- 

 rowly oblong, occasionally the lowest spatulate: heads 6 mm. high, sessile, 6-8 

 in a subcapitate, leafy-bracted cluster; bracts (pistillate) rather conspicuously 

 scarious, all obtuse, the scarious portion milk-white, elliptic to obovate. 

 Southwestern Wyoming. 



11. Antennaria rosulata Rydb. Bull. Torr. Bot. Club 24: 300. 1897. 

 Densely matted and depressed, the heads scarcely rising above the leaves: 

 these spatulate, obtuse or acutish, 6-10 mm. long: involucres about 7 mm. 

 high. (A. Sierrae-blancae Rydb. Bull. Torr. Bot. Club 31: 127. 1905, "leaves 

 glabrate above.") Arizona to southern Colorado. 



12. Antennaria oxyphylla Greene, Pitt. 4: 284. 1901. Stems 15-25 cm. 

 high: leaves spatulate-obovate, permanently tomentose on both surfaces, 2 

 cm. long or less: heads 6-15; involucres 7-8 mm. high; bracts in about 4 series, 

 imbricated, "all acute and of a rather dull white," rarely .pinkish : staminate 

 plant unknown. Southern Wyoming to South Dakota and British Columbia. 



13. Antennaria aprica Greene, Pitt. 3: 282. 1898. Low and usually densely 

 matted, less than 17 cm. high: leaves cuneate-obovate to narrowly oblanceo- 

 late, permanently tomentose on both surfaces, acute to obtuse: heads large 

 for the plant, the pistillate involucres 6-8 mm. high; bracts numerous and 

 imbricated; the tips in the pistillate plant. acute or obtuse, dull white or pink, 

 often with a brown spot at the base of the scarious portion; in the staminate 

 plant broad and obtuse, white. (A. Holmii Greene, Pitt. 4: 81. 1899.) 

 Dry ground, foothills and plains; New Mexico to Nebraska and northward 

 to Assiniboia and Manitoba. 



14. Antennaria marginata Greene, Pitt. 3: 290. 1898. Like A. aprica, but 

 leaves glabrous above, or nearly so, and prominently mucronate: staminate 

 involucral bracts with rhomboid-ovate and obtuse or acute tips. New Mex- 

 ico and southern Colorado. 



15. Antennaria oblancifolia E. Nels. Bot. Gaz. 30: 121. 1900. Caespitose; 

 stolons very short; stems slender, 15 cm. high or less: radical leaves oblanceo- 

 late, those of the stolons narrowly so, acute, mucronate, about 2 cm. long, 

 sparsely canescent to glabrous above, canescently tomentose below; cauline 

 leaves linear or oblong-linear, the lower acute, the upper acuminate: heads 

 4-13, in close racemose or paniculate clusters; involucres (staminate) 4 mm. 

 high, the herbaceous portion of the bracts sparsely woolly, the scarious por- 

 tion oval, obtuse, brownish or white. Yellowstone Park. 



16. Antennaria racemosa Hook. Fl. Bor. Am. 1: 329. 1834. Freely sur- 

 culose by long and slender, sparsely leafy stolons, lightly woolly, becoming 

 glabrate; flowering stems 1-4 dm. high, slender, sparsely leafy, bearing few or 

 numerous racemosely or paniculately disposed heads, nearly all slender- 

 peduncled: leaves thin, the radical broadly oval, acute at each end, slender- 

 petioled, obscurely 3-nerved at base, rather veiny, densely tomentose beneath, 

 green and glabrate above; cauline leaves similar but smaller and sessile, 

 lanceolate: involucre campanulate, 6 mm. high; the bracts green or brownish; 

 those of the staminate heads obtuse, the inner obscurely white-tipped ; those 

 of the pistillate heads narrow and mostly acute, with scarious white tips. 

 Moist woods and rocky banks; Oregon to British Columbia and the Rocky 

 Mountains. 



17. Antennaria obovata E. Nels. Bot. Gaz. 27: 213. 1899. Stems 30 cm. 

 high; stolons 5-8 cm. long: leaves tomentose on both sides; the basal 3 cm. 

 long, 3-ribbed, the midrib continuous to the apex, obovate-cuneate, about 13 

 mm. broad; cauline leaves small, oblong-linear: heads 3-7, corymbosely 

 disposed on pedicels 5-20 mm. long; involucres sparingly long, woolly; bracts 

 (pistillate) in several series; the outer short and obtusish; the inner twice as 

 long, narrow, acute to acuminate; nearly all with a purplish spot at the mid- 

 dle. (A. Howellii Greene, as to our range.) Along the eastern base of the 

 mountains; Colorado to the Black Hills. 



