COMPOSITAE (COMPOSITE FAMILY) 535 



long, less than 5 mm. wide: heads in close and rounded or often rather open 

 clusters: involucres 5-6 mm. high; bracts (pistillate) in about 3 series, nearly 

 equal or somewhat imbricated, the tips oval to linear, usually all obtuse, rose- 

 color to dull white: staminate plant unknown. From Colorado to Alberta 

 and the Pacific States. 



5a. Antennaria rosea imbricata E. Nels. Proc. U. S. Nat. Museum 23: 707. 

 1901. Leaves obovate or oblanceolate, obtusish, 20-25 mm. long, about 5 

 mm. wide, thin in texture, the indument appressed, whitish: involucral bracts 

 (pistillate) broader than in the species, in about 4 series, imbricated, rose- 

 color to nearly white. Wyoming and Montana to California and Oregon. 



6. Antennaria concinna E. Nels. Proc. U. S. Nat. Museum 23: 705. 1901. 

 Caespitose, with leafy offsets or procumbent stolons, the latter at most 5 cm. 

 long; stems slender, leafy, 10-15 cm. high: leaves spatulate, with no distinc- 

 tion of blade or petiole, scarcely abruptly acute, about 1 cm. long and 2-4 mm. 

 broad, white-tomentose on both surfaces; the cauline linear-oblong to linear, 

 acute, shorter than the internodes: heads 6-8 and glomerate, or often as many 

 as 15, and the cluster then rather open; involucres 6-7 mm. high; bracts 

 (pistillate) in about 3 series, all obtuse and about 1 mm. wide, the herbaceous 

 portion livid green, the outer bracts with a brown middle portion and their 

 tips light brown, the tips of the others rose-color or yellowish-white: stami- 

 nate plant unknown. Colorado and Wyoming to Washington. 



7. Antennaria corymbosa E. Nels. Bot. Gaz. 27: 212. March 1899. 

 Stem slender, 12-25 cm. high; stolons flexible: leaves from almost linear to 

 narrowly oblanceolate, rarely oblanceolate, acute, cuspidately mucronate, 

 25-35 mm. long, canescent or lightly tomentose, rarely green and glabrate: 

 heads more or less pediceled and corymbosely disposed; involucres 4-5 mm. 

 high; bracts with ;t brownish spot at the middle, the tips dull white or milky 

 white, the pistillate ones ovate to oblong, obtuse, the staminate rotund to 

 oblong, obtuse or truncate. [A. nardina Greene, Pitt. 4: 82. Dec. 1899.] 

 In the mountains; Colorado to Montana. 



8. Antennaria parvifolia Nutt. Trans. Am. Phil. Soc. 7: 406. 1842. Slen- 

 der, 1-3 dm. high; stolons short, procumbent: leaves rhomboidally spatulate 

 and acute or rarely with the terminal dilated portion obovate and obtuse, 

 5-15 mm. long, silvery-tomentose on both surfaces or only canescent above: 

 heads in a rounded cluster or in an open corymb; involucres 5-6 mm. high; 

 tips of the pistillate bracts visually narrow, obtuse or acute, dull white or 

 somewhat yellowish; those of the staminate bracts rotund to oblong, obtuse 

 or truncate, dull white or yellowish-white. (A. microphylla Rydb. Bull. 

 Torr. Bot. Club 24: 303. 1897.) Colorado to Nevada and northward to 

 Alberta. 



8a. Antennaria parvifolia bracteosa (Rydb.) A. Nels. About 3 dm. high: 

 leaves broadly spatulate, thin in texture, canescent or tomentose, 15-20 mm. 

 long; the cauline about 3 cm. long: involucral bracts (pistillate) narrow, the 

 tips white, acutish to acuminate. (A. bracteosa Rydb. Mem. N. Y. Bot. Gard. 

 1: 413. 1900.) Colorado to Montana. 



9. Antennaria arida E. Xels. Bot. Gaz. 27: 210. 1900. Stems 7-15 cm. 

 high: leaves small (8-12 mm. long) and inclined to be conduplicate, spatulate, 

 acute, hoary-tomentose: involucres about 6 mm. high; the bracts (pistillate) 

 nearly all equal, obtuse, or somewhat imbricated and acutish, the tips dull 

 white, very rarely pinkish: staminate plant unknown. In the arid desert 

 areas; Colorado, Wyoming, and Utah. 



Oa. Antennaria arida viscidula E. Nels. Proc. U. S. Nat. Museum 23: 710. 

 1901. Size, habit, and leaves of the species, but glandular about the inflores- 

 cence, stem, and usually on the leaves below: middle portions of outer bracts 

 (pistillate) greenish-yellow or brown, the tips dirty white or pale brown. 

 Wyoming and Colorado. 



96. Antennaria arida humilis (Rydb.) E. Nels. 1. c. General aspect of the 

 species but taller, 15-20 cm. high, rarely more: the leaves somewhat larger: 

 the involucral bracts moce unequal. (A.foliacea humilis Rydb. Mem. N. Y. 

 Bot. Gard. 1: 414. 1900.) Montana and Wyoming. 



