534 COMPOSITAE (COMPOSITE FAMILY) 



Tips of invqlucral bracts white. 

 Stems evident. 



Stems generally more than 1 dm. high (1-4 dm.); to- 



mentum fine, silky, appressed. 



Leaves of the stolons narrowly oblanceolate, acute . 7. A. corymbosa 

 Leaves of the stolons spatulate, obtuse or acute . 8. A. parvifolia. 



Stems rarely more than 1 dm. high (3-15 cm.); hoary- 



tomentose. 



Leaves conduplicate for the most part . . 9. A. arida. 



Leaves not conduplicate . . . . . 10. A. scariosa. 



Stems wanting, the heads sessile in the rosulate leaves . 11. A. rosulata. 

 Heads comparatively large, involucres 8 (7-9) mm. high. 

 Leaves permanently tomentose on both surfaces. 



Pistillate bracts acute 12. A. oxyphylla. 



Pistillate bracts generally obtuse 13. A. aprica. 



Leaves glabrous above or nearly so 14. A. marginata. 



Leaves comparatively large, 3-5 cm. long. 

 Leaves green and glabrate above. 



Leaves oblanceolate to linear . . . . . . 15. A. oblancifoha. 



Leaves broadly oval to oblong . . . . . . 16. A. racemosa. 



Leaves tomentose above also . . . . . . . 17. A. obovata. 



PLANTS NOT SURCULOSE-PROLIFEROUS 

 Plants more than 1 dm. high; pappus-bristles of the staminate heads 



clavate. 

 Plants tall (3-6 dm.); bracts tomentose except the scarious tips. 



Leaves linear or narrowly oblanceolate .... 18. A. luzuloides. 



Leaves lanceolate or spatulate-lanceolate .... 19. A. pulcherrima. 



Plants lower (less than 3 dm.); bracts nearly glabrous . . 20. A. oblanceolata. 

 Plants less than 1 dm. high; pappus-bristles not clavate . . . 21. A. dimorpha. 



1. Antennaria media Greene, Pitt. 3: 286. 1898. Rarely more than 6 cm. 

 high; stolons 1-3 cm. long: leaves spatulate-oblanceolate, often narrowly 

 so, abruptly acute or acutish, 15 mm. or less long, white or grayish-tomentose 

 on both surfaces: involucres (pistillate) about 4 mm. high; tips of the pis- 

 tillate bracts oblong to oblong-linear, obtuse, rarely acutish, green or greenish- 

 brown, rarely light brown and whitish at the very tips; tips of the staminate 

 bracts oval, obtuse, of same color as the pistillate ones. From the mountains 

 of California to British Columbia and in the Rocky Mountains from Colorado 

 to Alberta. 



2. Antennaria fusca E. Nels. Bot. Gaz. 30: 120. 1900. About 1 dm. high: 

 leaves spatulate, obtuse and more or less truncate at apex, indistinctly mucro- 

 nate, about 2 cm. long, 5-7 mm. broad, canescently tomentulose or striate- 

 woolly on both surfaces: involucres 6-7 mm. high, the tips of the bracts 

 (pistillate) oblong or oblong-linear, obtuse, greenish-brown to buff-color: 

 staminate plant unknown. In the mountains; Wyoming. 



3. Antennaria reflexa E. Nels. Bot. Gaz. 27: 208. 1899. Slightly suf- 

 frutescent, 5-15 cm. high: leaves spatulate or spatulate-obovate, obtuse, 6-15 

 mm. long (usually 10 mm.), dull grayish-white, tomentose on both surfaces: 

 involucres 4-5 mm. high; the bracts few, in less than 3 series; the tips of the 

 pistillate usually from oval in the outer to oblong-linear in the inner, all ob- 

 tuse, less frequently ovate or lanceolate in the outer to linear in the inner, and 

 acute or acuminate, greenish-brown to yellowish-white, rarely rose-color; the 

 tips of the staminate oval, obovate or oblong, obtuse or truncate, usually of 

 firm texture, like the pistillate ones as to color. (A. flavescens Rydb. Mem. 

 N. Y. Bot. Gard. 1: 411. 1900.) Colorado to Montana. 



4. Antennaria- umbrinella Rydb. Bull. Torr. Bot. Club 24: 302. 1897. 

 Stems 10-15 cm. high; stolons 4 cm. long or less: leaves narrowly spatulate- 

 oblanceolate, acute or abruptly acute and mucronate, 15-25 mm. long, 

 canescent on both surfaces, rarely tomentose: involucres 5-6 mm. high; tips 

 of the bracts (pistillate) oblong or oblong-lanceolate, obtuse, rarely acutish, 

 greenish-brown, the very tips often whitish: typical staminate plants un- 

 known. (A. mucronata E. Nels. 1. c. 209.) Colorado to Montana and Oregon. 



5. Antennaria rosea (Eat.) Greene, Pitt. 3: 281. 1898. Slender, 2-4 dm. 

 high; sterile basal branches ascending to erect, rarely prostrate; the canescent 

 tomentum of the leaves and the striate wool of the stems slightly viscid: 

 leaves very narrowly oblanceolate or elongated-spatulate, acute, 15-20 mm. 



