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; 

 Mentselia ornata Pursh) In canons 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. i. 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. 



2. A. gracilis. 



Leaves divided Y2- 2 /3 to the midrib, with divergent lobes ; plant ascend- 

 ing or diffuse. 3- A. ctenophora. 

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

 Sepals linear-oblong, obtusish, only y 3 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. 5- A. dispersa. 

 Low, less than 2 dm. high; capsules 12-15 nim. 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 Canon; near Boulder; Los Pinos ; 

 Mancos; Glenwood Springs; Sunset Canon. 



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



