RYDBERG: Rocky MOUNTAIN FLORA 157 
Hymenoxys multiflora (Buckley) Rydb. 
Phileozera multiflora Buckley, Proc. Acad. Nat. Sci. Phila. 1861 : 
459. 1862. 
Picradenia multifora Greene, Pittonia 3: 273. 1808. 
Hymenoxys chrysanthemoides multifiora Cockerell, Bull. Torrey 
Club 31: 507. 1904. 
Hymenoxys multiflora Osterhoutii (Cockerell) Rydb. 
Picradenia odorata Osterhoutii Cockerell, Bull. Colo. College Mus. 
11 D 1903. 
Hymenoxys chrysanthemoides Osterhoutii Cockerell, Bull. Torrey 
Club 31: 505. 1904. 
Achillea alpicola Rydb. 
Achillea lanulosa alpicola Rydb. Mem. N. Y. Bot. Gard. 1: 426. 
1900. 
Artemisia Scouleriana (Besser) Rydb.  __ 
Artemisia desertorum Scouleriana Besser ; Hook. Fl. Bor. Am. 1: 
325. 1833. 
Artemisia pabularis (A. Nels.) Rydb. 
Artemisia rhizomata pabularis A. Nelson, Bull Torrey Club 27: 
34. 1900. 
Artemisia viscidula (Osterhout) Rydb. 
Artemisia cana viscidula Osterhout, Bull. Torrey Club 27: 507. 
Igoo. 
Carduus filipendulus (A. Gray) Rydb. 
Cirsium virginianum filipendulum A. Gray, Man. ed. 5. 273- 
1880. 
Cirsium Jilipendulum Engelm.; A. Gray, loc. cit., as a synonym. 
Cnicus altissimus filipendulus A. Gray, Proc. Am. Acad. 19: 57- 
1883. 
Senecio Flintii Rydb. sp. nov. 
Perennial with a cluster of fibrous-fleshy roots ; stem about 
3 dm. high, striate, sparingly arachnoid-hairy ; basal leaves about 
8 cm. long; blades orbicular or rounded-oval, abruptly con- 
