236 LOASACEAE. 



11. Touterea nuda (Nutt.) Eat. & Wr. {Mentzelia nuda Nutt) On plains 

 and hillsides from western Neb. and Wyo. to Colo. — Alt. 4000-7000 ft. — 

 Livermore, Larimer Co. ; gulch west of Pennock's ; Platte Canon ; valley of 

 upper Arkansas River; Boulder. 



12. Touterea stricta Osterh. (_Hesperaster strictus Osterh.) On plains, 

 hillsides and dry valleys from western Neb. and Wyo. to Kans. and Tex. — ■ 

 Alt. 4000-7000 ft. — Colorado Springs ; New Windsor, Weld Co. ; Ft. Collins ; 

 near Manitou ; Denver ; Arboles ; Pueblo ; along the Poudre ; Spring Canon, 

 Lyons ; Boulder. 



13. Touterea decapetala (Pursh) Rydb. {Bartonia decapetala Pursh; 

 Mentzelia ornata Pursh) In caiions from S. Dak. and Alb. to Tex. and Nev. 

 ^Alt. 4000-7000 ft. — Ft. Collins ; west of Loveland ; Huerfano Valley, near 

 Gardner; near Boulder. 



2. ACROLASIA. 



Sepals lanceolate-subulate, half as long as the petals or longer, acute ; seed rather 

 strongly muriculate. 

 Leaves ovate in outline, entire or merely coarsely toothed. 1. A. latifolia. 

 Leaves lanceolate in outline ; stem-leaves, except the uppermost, pinnately 

 divided or lobed. 

 Petals 5-7 mm. long, about twice as long as the sepals. 



Leaves divided to near the midrib with ascending lobes ; plant erect. 



■^. A. gracilis. 

 Leaves divided Y^-Vz to the midrib, with divergent lobes ; plant ascend- 

 ing or diffuse. 3. A. ctenophora. 

 Petals 2-4 mm. long. 4. A. albicaulis. 

 Sepals linear-oblong, obtusish, only '/j as long as the petals, which are 3-4 

 mm. long; seeds minutely muriculate (tubercles seen only by very strong 

 magnifications) ; leaves entire or dentate ; the upper broadly ovate. 

 Tall, 3-5 dm. high ; capsules 2-3 cm. long ; lower leaves lanceolate or linear- 

 lanceolate, some of them usually toothed. S. A. disperse. 

 Low, less than 2 dm. high; capsules 12-15 mm. long; leaves all ovate, entire. 



6. A. compacta. 



1. Acrolasia latifolia Rydb. On hillsides in Colo.^Alt. 6000-8000 ft.— 

 Boulder ; between Sunshine and Ward ; Larimer County. 



2. Acrolasia gracilis Rydb. {Trachyphytum gracilis Nutt.) In sandy soil 

 from Wyo. and Ore. to Colo.- — Alt. 5000-8000 ft. — Foot-hills, Larimer Co.; 

 mesas near Pueblo ; Salida ; Tobe Miller's ranch. 



3. Acrolasia ctenophora Rydb. On dry hills and on railroad banks in 

 southern Colo. — Alt. 6000-7000 ft. — Walsenburg ; ' Cucharas River below La 

 Veta. 



4. Acrolasia albicaulis (Dougl.) Rydb. {Mentzelia albicaulis Dougl.) On 

 sandy soil from Neb., Mont, and B. C. to N. M. and Utah. — Alt. 4000-7000 ft. 

 ^Mesa, Gunnison River; Hotchkiss; Rist Caiion; near Boulder; Los Pinos; 

 Mancos; Glenwood Springs; Sunset Caiion. 



5. Acrolasia integrifolia (S. Wats.) Rydb. (M. albicaulis integrifoliu S. 

 Wats. ; M. dispersa S. Wats.) In sandy soil from Mont, and B. C. to Colo, 

 and Calif. — Alt. 6000-7000 ft. — Glenwood Springs, Garfield Co.; Horsetooth 

 Gulch. 



6. Acrolasia compacta (A. Nels.) Rydb. {M. compacta A. Nels.) In 

 sandy soil in Wyo. and Colo. — Steamboat Springs. 



