PLATE FOUR. 



Fig. 26. Senecio bUtmdes Greene, from Mount Elbert (12,000 feet altitude); natural size. 



27. Senecio dimorphophyllus Greene, from Mount. Massive (12,000 feet altitude); natural size. 



28. Senecio Holmii Greene, from Mount Elbert (12,000 feet altitude); natural size. 



29. Gentiana plebeja Cham. f. Holmii Wettst., from Mount Massive (12,000 feet altitude i; natural size. 



30. Eritrichium argenteum White, from Longs Peak (12,500 feet altitude); natural size. 



