428 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



Plants with prostrate runners. 



Heads on long slender stalks, in loose racemes; bracts nearly glabrous; leaves 



glabrous on the upper surface 4. A. racemosa. 



Heads usually short-stalked, in corymbs; bracts woolly at the base; leaves glabrous 

 or usually woolly. 

 Upper portion of the bracts pink, white, or yellowish white. 



Leaves glabrous on the upper surface 6. A. howellii. 



Leaves woolly on the upper surface. 



Bracts with pink tips 6. A. rosea. 



Bracts with white or yellowish white tips. 



Leaves of the runners loose, narrowly oblanceolate; bracts with dark 



spots 7. A. corymbosa. 



Leaves of the runners dense, spatulate; bracts without dark spots. 



Bracts of the pistillate heads obtuse 8. A. arida 



Bracts of the pistillate heads (at least the inner ones) acute. 



9. A. microphylla. 

 L'pper portion of the bracts blackish, dark green, or pale or dark brown. 



Leaves becoming glabrous and green 10. A. chlorantha. 



Leaves very woolly on both sides. 



Leaves of the runners broadly obovate-wedge-shaped, nearly sessile. 



11. A. pulvinata. 

 Leaves of the runners spatulate or oblanceolate, narrowed into distinct 

 petioles. 



Bracts very dark, nearly black 12. A. media. 



Bracts brown or pale brown. 



' Pubescence of the leaves of closely appressed yellowish hairs. 



13. A. flavescens. 

 Pubescence of the leaves of rather loose white hairs. 



Bracts of the pistillate heads acute or acutish ... 14. A. oxyphylla. 

 Bracts of the pistillate heads obtuse. 



Involucres somewhat viscid; bracts with pale tips. 



15. A. sedoides. 



Involucres not ^dscid; bracts with brown tips . . 16. A. umbrinella. 



1. Antennaria luzuloides Torr. & Gray. Frequent on open, rocky, or brushy slopes 

 at middle altitudes, or sometimes above timber line. B. C. to Oreg., Wyo., and Mont. — 

 Plants slender, 20 to 40 cm. high; leaves linear-oblanceolate, 3 to 8 cm. long, acute or 

 obtuse, silky-woolly, usually with conspicuous nerves; heads numerous, pale brown. 



Plants often deformed by galls. 



2. Antennaria lanata (Hook.) Greene. Rare on open rocky slopes about Gunsight 

 Pass. B. C. to Oreg., Mont., and Alta. — Plants densely and loosely white-woolly; 

 leaves narrowly oblanceolate, 3 to 8 cm. long; heads few, densely clustered; bracts 

 with pale tips. 



3. Antennaria anaphaloides Rydb. Occasional on dry hillsides at low altitudes. 

 B. C. to Oreg., Colo., and Mont. — Plants densely silky-woolly; leaves narrowly oblan- 

 ceolate, 8 to 15 cm. long, acute, conspicuously nerved; heads numerous, in a dense 

 corymb, the bracts with white tips. 



4. Antennaria racemosa Hook. Frequent in meadows above timber line; some- 

 times on open grassy slopes at lower levels. B. C. to Calif., Wyo., and Alta. — Plants 

 15 to 40 cm. high, with long runners; leaves oval or spatulate, 3 to 6 cm. long, obtuse, 

 stalked, bright green on the upper surface, woolly beneath; heads few, 6 to 8 mm. 

 high, the bracts greenish, acute. 



5. Antennaria howellii Greene. Meadow among aspens at east entrance; the species 

 has been collected at Columbia Falls and so is probably to be found about Belton. 



