3G8 CARDUACEAE. 



Leaves of the stolons narrowly oblanceolate, 1.5-5 cm. long; bracts 



with dark spots. 7. A. tiardiua. 



Leaves of the stolons spatulate, 0.5-3 cm. long ; bracts not with dark 

 spots. 

 Leaves of the stolons 5-15 mm. long, rhombic-spatulate ; tomen- 



tum very fine, appressed and silky. 8. A. microphylla. 



Leaves of the stolons spatulate, usually rounded at the apex, 

 15-30 mm. long; tomcntuni looser. 

 Bracts of the pistillate heads obtuse ; plant 1--2 dm. high. 



9. A. viscidula. 

 Bracts of the pistillate heads acute. 



Inflorescence and upper leaves glanduiar-hairy ; leaves of the 

 inflorescence large, scarcely smaller than the upper stem- 

 leaves; bracts greenish. 10. A. bract eosa. 

 Inflorescence and upper leaves not glandular ; the latter re- 

 duced ; bracts brownish. 11. A. oxyphylla. 

 Heads 8-12 mm. high. 



Leaves toraentose on both sides. 



Plant tall, 2-3 dm. high ; heads usually peduncled. 



Leaves less than 2 cm. long and 5-8 mm. wide, usually not triple- 

 nerved ; heads 7-9 mm. high. 11. A. oxyphylla. 

 Leaves over 2 cm. long, 7-10 mm. wide, triple-nerved; heads 

 about I cm. high. 12. A. obovata. 

 Plant low, usually less than i dm. high ; heads subsessile. 



13. A. aprica. 

 Leaves glabrous above. 14. A. marginata. 



Plant acaulescent ; heads subsessile among the rosettes of the basal leaves. 

 Bracts with white upper portion ; leaves white on both sides. 



15. A. rosulata. 

 Bracts with brown upper portion ; leaves glabrate above. 



16. A. Sierrae-Blancae. 

 Plants not surculose-proliferous. 



Heads 4-5 mm. high ; bracts nearly glabrous, scarious throughout ; leaves 



silky-tomentose. 17. A. oblanceolata. 



Heads 6-10 mm. high; bracts tomentose at the base; only tips scarious; 

 leaves villous-tomentose. 

 Bracts with a large dark spot ; those of the pistillate heads ovate to lan- 

 ceolate, acute ; those of the staminate heads ovate or oval, obtuse or 

 acutish ; pistillate heads about 8-10 mm. high, turbinate at the base. 



18. A. pulcherrinia. 

 Bracts with small dark spots or none ; bracts of both staminate and pis- 

 tillate heads with oblong or oval, obtuse tips ; those of the staminate 

 heads slightly broader. 19. A. anaphaloides. 



Pappus-bristles of the staminate heads not clavnte ; achenes puberulent ; hairs 

 bifurcate at the apex : plant low and densely cespitose. 20. A. dimorpha. 



1. Antennaria media Greene. On the higher peaks from Mont, and B. C. 

 to Colo, and Calif. — Alt. 10,000-13,000 ft. — Massif de I'Arapahoe; Little Kate 

 Basin, La Plata Mountains ; Alpine Tunnel ; West Spanish Peak ; near Pagosa 

 Peak ; Bottomless Pit ; Silver Plume ; mountain southeast of Cameron Pass. 



2. Antennaria umbrinella Rydb. On the higher mountains from Mont, and 

 Ida. to Colo. — Alt. 7500-13,000 ft. — Ruxton Dell ; Alpine Tunnel ; Sierra 

 Blanca; Little Kate Basin; divide road to Steamboat Springs; Gunnison; 

 Ironton, San Juan Co. ; Berthoud Pass. 



3. Antennaria flavescens Rydb. On dry hills from ^lont. and Wash, to 

 Colo. — Alt. up to 10,500 ft. — Hahn's Peak; Spicer. 



4. Antennaria concinna E. Nels. On mountain ridges of Colo, and Utah. — 

 Alt. about 9000 ft. — Palsgrove Cafion. 



