400 
CARDUACEAE. 
V. PULCHEI.LI. 
Leaves not white-tomentose beneath. 
Leaves sparingly floccose when young, or glabrate. 
Leaves glabrous, the lower twice pinnate. 
Leaves white-tomentose beneath. 
VI. Undulati. 
18. C. truncatus. 
19. C. bipinnatus. 
20. C. pulchellus. 
Flowers ochroleucous ; bracts very viscid, with broad glandular dorsal ridges. 
Tips of the inner bracts more or less dilated and crisp; involucre of the ter¬ 
minal head 4-5 cm. in diameter. 21. C. plattensis. 
Tips of the inner bracts linear-lanceolate, neither dilated nor crisp ; involucres 
usually 3 cm. wide or less. 22. C. Tracyi. 
Flowers rose or purple, rarely white; glandular ridge not so prominent. 
Involucres less than 3 cm. wide. 
Spines of the middle bracts 5-10 mm. long, erect or ascending. 
23. C. canescens. 
Spines of the middle bracts 5 mm. or less long, weak and spreading. 
Leaves entire or slightly lobed. 24. C. oblanceolatus. 
Leaves pinnately divided or deeply lobed. 
Leaves deeply pinnatifid with narrow, linear-lanceolate lobes; plant 
often yellowish. 25. C. Flodmanii., 
Leaves with triangular or ovate-lanceolate lobes. 
Bracts with a very inconspicuous glandular ridge, not at all viscid. 
26. Hoccosus. 
Bracts with a conspicuous glandular ridge, surrounded by a viscid area. 
27. C. undulatus. 
Involucres 4-6 cm. in diameter. 
Spines of the involucral bracts scarcely over 5 mm. long; leaves very broad. 
28. C. megacephalus. 
Spines of the involucres 1 cm. long; leaves narrow. 29. C. ochrocentrus. 
One species. 
One species. 
One species. 
VII. Altissimi. 
VIII. Arvenses. 
IX. Neo-mexicani 
30. C. filipenduliis. 
31. C. arvensis. 
32. C. neo-mexicanus. 
1. Carduus Parryi (A. Gray) Greene. ( Cnicus Parryi A. Gray) In the 
mountains of Colo., Utah and N. M.—Alt. 5000-11,000 ft.—Marshall Pass; 
La Veta; along the Uncompahgre River, near Ouray; Steele Canon, Villa 
Grove; Redcliffe; Marshall Pass; Echo Creek, near La Veta; Veta Pass; 
near Pagosa Peak; Boulder; near Empire; Twin Lakes. 
2. Carduus Osterhoutii Rydb. In the mountains of Colo.—Redcliffe; Ten¬ 
nessee Pass. 
3. Carduus Hookerianus (Nutt.) Heller. ( Cnicus Hookerianus A. Gray) 
In the mountains from Alb. and B. C. to Colo.—Alt. 11,000-12,000 ft.—Bert- 
houd Pass. 
4. Carduus araneosus Osterhout. Mountains of Colo.—Redcliffe. 
5. Carduus oreophilus Rydb. In wooded valleys of Colo.—Alt. 6000-12,000 
ft.—Banks of Larimer Co.; Silver Plume; Georgetown; Pagosa Springs; 
Steamboat Springs; Boreas; Garland. 
6 . Carduus scopulorum Greene. ( Cnicus eriocephalus A. Gray) In the 
mountains of Colo.—Alt. 9500-12,000 ft.—Ward; Mt. Harvard; head of 
Beaver Creek; Ruxton Dell; Mt. Baldy, Pike’s Peak; Cameron Pass; Bert- 
houd Pass. 
