CARDUACEAE. 337 



3. Laciniaria scariosa (L.) Hill. (Liatris scariosa Willd.) On prairies 

 from Me. and S. D. to Fla. and Kans. It has been reported from Colorado, 

 but all specimens seen so named belong to the preceding. 



Tribe 3. ASTEREAE. 



6. GUTIERREZIA Lag. 



Disc- and ray-flowers in each head 3-7 each. 



Surface of the leaves marked with large dots, each bordered by a hyaline scale. 



i. G. lepidota. 



Surface of the leaves not lepidote, either puberulent or glabrous. 

 Axils of the leaves with fasciculate branches. 2. G. fasciculata. 



Axils of the leaves without fasciculate branches. 

 Plant shrubby. 



Involucres elongated, clavate-turbinate, 2-3 mm. wide ; bracts oblong 



or lanceolate. 3. G. longifolia. 



Involucres campanulate, only slightly turbinate at the base, 3-4 mm. 



wide ; bracts ovate or obovate. 4. G. linearis. 



Plant ligneous only at the short persistent caudex. 

 Leaves linear, usually 1.5-4 mm - wide. 



Involucres oblong-turbinate, over 5 mm. long ; outer bracts lanceo- 

 late ; stems 3-4 dm. high. 5. G. scoparia. 

 Involucres campanulate, somewhat turbinate only at the base ; bracts 

 ovate ; stems 1-2 dm. high. 6. G. diversifolia. 

 Leaves linear-filiform, less than i mm. wide. 



Ligules of the rays fully as long as the involucre. 7. G. filifolia. 

 Ligules of the rays about half as long as the involucre. 



Heads usually peduncled and solitary at the ends of the branches. 



8. G. divaricata. 

 Heads usually subsessile in clusters of 3-4 at the ends of the 



branches. 

 Plant low, 1-2 dm. high ; branches green ; leaves 1-2 cm. long. 



9. G. juncea. 

 Plants 3-4 dm. high ; branches with straw-colored bark ; leaves 



3-4 cm. long. 10. G. Sarothrae. 



Disc- and ray-flowers in each head only 1-2 each. n. G. glomerella. 



1. Gutierrezia lepidota Greene. On dry plains of western Colo. Grand 

 Junction. 



2. Gutierrezia fasciculata Greene. On dry plains in western Colo. Grand 

 Junction. 



3. Gutierrezia longifolia Greene. On dry hills and plains from Colo, and 

 Utah to N. M. Alt. 4000-5500 ft Canon City; Westcliffe; Boulder. 



4. Gutierrezia linearis Rydb. On plains from Neb. and Colo, to Kans. and 

 N. M. Alt. 6000-8000 ft. Gunnison; Red Rock Canon, near Pike's Peak. 



5. Gutierrezia scoparia Rydb. On dry plains from Wyo. to Colo. Alt. 

 5000-7000 ft. Colorado Springs; Manitou; Boulder. 



6. Gutierrezia diversifolia Greene. On plains from Sask. and Mont, to 

 N. M. and Utah. Alt. 5000-8000 ft. Upper Larimer River; Ft. Collins; 

 Gunnison; Muddy River, Middle Park; Parlin; Manitou; west of Loveland; 

 La Veta; Timnath. 



7. Gutierrezia filifolia Greene. On dry plains from Ida. to N. M. and 

 Nev. Alt. about 7000 ft. Cucharas Valley, near La Veta. 



8. Gutierrezia divaricata Nutt. On plains from Wyo. to Tex. and Utah. 

 San Juan Co. 



22 



