GENTIAN ACEAE. 
267 
Upper stem-leaves linear or lance-linear. 
Flower-cluster dense; its branches and internodes very short. 
5. D. Bigelovii. 
Flower cluster lax, its branches and internodes elongated. 
6 . D. interrupta. 
1. Dasystephana Romanzovii (Ledb.) Rydb. ( Gentiana Romanzovii 
Ledeb.; G. frigida A. Gray; not Haenke) On alpine peaks and in arctic 
regions from Mont, and Alaska to Colo, and Utah; also Asia.—Alt. 11,coo- 
14, 000 ft.—Headwaters of Clear Creek; Gray’s Peak; Gentian Ridge; Saddle 
Cliffs; Mt. Harvard; Alpine Tunnel; Mt. Ouray; Seven Lakes, near Pike’s 
Peak; Georgetown; near Pagosa Peak; Dead Lake, near Pike’s Peak; Devil’s 
Causeway, White River Plateau; Cameron Pass; Berthoud Pass; Ethel Peak. 
2. Dasystephana Parryi (Engelm.) Rydb. ( Gentiana Parryi Engelm.) In 
the mountains from Wyo. to Colo, and Utah.—Alt. 8000-12,000 ft.—Trapper’s 
Lake; Pike’s Peak between Half-way House and Lake Mer; near Pagosa 
Peak; Westcliffe; Mt. Harvard; Artist’s Glen near Pike’s Peak; Georgetown; 
Seven Lakes; Marshall Pass; Ruxton Park; Grand Lake; Ironton Park, 
9 miles south of Ouray; Red Mountain road, south of Ouray; Crested 
Butte; headwaters of Clear Creek; Red Mountain; Breckenridge; Sprague’s, 
Estes Park; Leroux Parks, Delta Co.; Buffalo Pass; Empire; mountains 
between Sunshine and Ward. 
3. Dasystephana affinis (Griseb.) Rydb. ( Gentiana affinis Griseb.) In 
the mountain meadows from Sask. and Alb. to Colo.—Alt. 7000-12,000 ft. 
—Mountain meadows. Twin Lakes; Sand Creek Pass; Pike’s Peak; Trail 
Glen; Crystal Park; Lake John, North Park; Colorado Springs; headwaters 
of Clear Creek, near Empire; between Porter and Durango; Sprague’s, Estes 
Park; Medicine Bow Mountains. 
4. Dasystephana Forwoodii (A. Gray) Rydb. ( Gentiana Forwoodii A. 
Gray) On hills from Alb. to Colo.—Alt. 7000-10,000 ft.—Gray’s Peak; Sar¬ 
gent; Westcliffe; Twin Lakes; headwaters of Clear Creek near Empire; 
Pearl; Wolcott; Gunnison; Mt. Harvard; Lake City; Buena Vista; Gypsum 
Creek Canon. 
5. Dasytephana Bigelovii (A. Gray) Rydb. ( Gentiana Bigelovii A. Gray) 
In the mountains from Colo, to N. M. and Ariz.—Alt. about 6000 ft.—Col¬ 
orado Springs; Pike’s Peak; Sprague’s; Estes Park; west of Soldier Canon. 
6. Dasystephana interupta (Greene) Rydb. ( Gentiana interupta Greene) 
In the mountains from Colo, to Nev.—Alt. about 8000 ft.—Kremmling; Pa¬ 
gosa Springs; Parlin, Gunnison Co. 
7. PLEUROGYNE Eschsch. 
1. Pleurogyne fontana A. Nels. (P. rotata Hook., in part; not Griseb.; 
P. rotata tenuifolia Griseb.) In damp places from Hudson Bay and Alaska 
to Colo.—Alt. 8000-11,000 ft.—Twin Lakes; near Lake John, North Park; 
Jefferson, South Park; Caribou; headwaters of Clear Creek, near Empire; 
Beaver Creek. 
8. SWERTIA L. 
Flowers 4-merous. 
Flowers 5-merous. 
Inflorescence elongated ; corolla-lobes linear or oblong. 
Inflorescence congested; corolla-lobes oval-elliptic. 
1. S. scopulina 
2. S. palustris. 
3. Y. congesta. 
