266 GENTIANACEAE. 



2. Amarella heterosepala (Engelm.) Greene. (Gentiana heterosepala 

 Engelm.) In damp ground in Utah and Colo. Alt. about 9000 ft. Near 

 Pagosa Peak ; divide road to Steamboat Springs ; western Gunnison Co. 



3. Amarella strictiflora (Rydb.) Greene. (Gentiana amarella stricta S. 

 Wats.; G. strictiflora Rydb.) On hillsides and damp places from Sask. and 

 Alaska to Colo, and Calif. Alt. 7500-12,000 ft. Empire ; mountains between 

 Sunshine and Ward; Gunnison; Lake John; North Park; Mt. Harvard; 

 Ribbon Lake; Estes Park, Larimer Co.; Seven Lakes; Chambers' Lake; 

 Bottomless Pit, Pike's Peak ; headwaters of Clear Creek near Empire ; Bergen 

 Park ; South Park, southeast of Jefferson ; Baxter's ranch. 



4. Amarella scopulorum Greene. (Gentianella dementis Rydb.) In damp 

 places from Mont, and S. D. to Colo, and Ariz. Alt. 9000-12,000 ft. 

 Clear Lake ; Idaho Springs ; Palsgrove Canon ; Ruxton Dell ; Minnehaha ; 

 Middle Park; below Half-way House, Pike's Peak; Graymont; Hamor's 

 Lake above Durango; Artist's Glen near Pike's Peak; Pike's Peak; Silver 

 Plume; headwaters of Clear Creek; Bosworth's ranch. 



5. Amarella plebeja (Cham.) Greene. (Gentiana plebeja Cham.; G. 

 Amarella acuta A. Gray; not Hook.) In wet places from Mackenzie and 

 Alaska to Colo, and Calif. (?). Alt. 8000-10,000 ft. Georgetown; Middle 

 Park, near Cozzens ; Marshall Pass ; Grand Lake ; Deep Creek Lake ; north 

 of Steamboat Springs ; vicinity of Pine Grove. 



Amarella plebeja Holmii (Wettst.) Rydb. (Gentiana plcbeja Holmii 

 Wettst. ; G. Amarella nana Engelm.) A low alpine variety. Alt. 10,000- 

 12,000 ft. Caribou; Buffalo Pass; Breckenridge. 



5. CHONDROPHYLLA (Bunge) A. Nels. 



Leaves and calyx-lobes with broad scarious margins ; the capsule long-stipitate 

 and at last exserted from the corolla. i. C. Fremontii. 



Leaves and calyx-lobes slightly scarious-margined ; capsule short-stipitate, not 

 exserted. 2. C. americana. 



1. Chondrophylla Fremontii (Torr.) A. Nels. (Gentiana humilis Engelm.; 

 not Stev. ; G. Fremontii Torr.) On alpine wet brook-banks in Wyo. and 

 Colo. Alt. 7000-10,000 ft. Gunnison; headwaters of Sangre de Cristo Creek; 

 headwaters of Clear Creek; Georgetown; Como. 



2. Chondrophylla americana (Engelm.) A. Nels. (Gentiana prostrata 

 Hook; not Henke. ; van Americana Engelm.) In wet places along streams 

 from Alb. and Alaska to Colo. Alt. 10,000-12,000 ft. Wilson, San Miguel 

 Co. ; " Colorado " ; northeast of Boreas. 



6. DASYSTEPHANA Adans. CLOSED GENTIAN. 



Testa of the seeds lamellose-rugose ; the lamellae white, forming hexagonal 

 areolas ; basal leaf-rosette remaining at flowering time. i. D. Romanzovii. 

 Testa of the seeds smooth, but often produced into wings ; basal rosette none. 

 Floral leaves more or less broadened and more or less scarious ; seeds usually 



wingless. 2. D. Parry i. 



Floral leaves narrow, not scarious ; seeds winged. 



Leaves all except the floral ones ovate, oblong or lanceolate. 

 Calyx-lobes well developed ; calyx-tube truncate at the apex. 



3. D. affinis. 



Calyx-lobes none or minute ; calyx-tube irregular, more or less lobed or 

 cleft. 4. D. Forit'ooiiii. 



