338 CARDUACEAE. 



9. Gutierrezia juncea Greene. On dry hills and plains from Okl. and Colo, 

 to Ariz. Alt. 7000-10,000 ft. Garden of the Gods; Twin Lakes; Westcliffe. 



10. Gutierrezia Sarothrae (Pursh.) B. & R. (G. Euthaniae T. & G.) On 

 plains from Neb. and Wyo. to Kans. and Utah. Alt. 4000-7000 ft. Colorado 

 Springs; Salida. 



11. Gutierrezia glomerella Greene. On dry plains from Colo, to N. M. 

 Alt. about 4700 ft. Deer Run. 



7. GRINDELIA Willd. GUM PLANT, RESIN-WEED. 



Tips of the outer bracts spreading; none reflexed. i. G. decumbens. 



Tips of the bracts squarrose ; those of the outer ones strongly reflexed. 

 Heads radiate. 



Pappus-awns apparently smooth ; barbules seen only under a compound 



microscope. 

 Stem-leaves oval, ovate, or ovate-oblong with a broad base. 



Leaves bluish-green, spinulose-dentate ; heads very broad and flat; its 



bracts broad and even the squarrose tips flattened. 2. G. texana. 

 Leaves yellowish-green, merely dentate; heads hemispherical; its bracts 



narrow and with terete squarrose tips. 3. G. squarrosa. 



Stem-leaves oblanceolate, rarely oblong. 



Leaves all finely serrate, dentate or subentire. 



Leaves finely and closely serrate. 4. G. serrulata. 



Leaves rather remotely dentate or subentire. 5- G. perennis. 



Leaves coarsely toothed ; the basal ones sub-laciniate. 6. G. subincisa. 

 Pappus-bristles distinctly barbellate ; barbules distinctly seen with a com- 

 mon pocket-lens. 



Stem tall, 4-6 dm. high, usually solitary ; stem-leaves broadly oblong or 

 obovate ; bracts broad, only the outer ones squarrose-reflexed. 



7. G. erecta. 



Plant low, about 3 dm. high ; usually several stems from the base ; stem- 

 leaves oblanceolate or oblong ; all bracts squarrose. 8. G. subalpina. 

 Heads discoid. 



Stem-leaves oval or obovate. 9- G. inornata. 



Stem-leaves oblanceolate or oblong. 



Outer bracts strongly recurved; inner not squarrose. 10. G. fastigiata. 

 All bracts squarrose. n. G. aphanactis. 



1. Grindelia decumbens Greene. On plains from Kans. and Colo, to N. M. 

 Alt. 4000-7000 ft. Durango; Ignacio; Pagosa Springs; Mancos; Cimarron. 



2. Grindelia texana Scheele. (G. grandiflora Gray, in part; not Hook.) 

 On plains from Colo, to Tex. and N. Mex. Alt. about 5000 ft. Lower 

 Boulder Canon. 



3. Grindelia squarrosa (Pursh) Dunal. On prairies and plains from Iowa 

 and Wyo. to Kans. and Ariz. Alt. up to 6000 ft. Colorado Springs. 



4. Grindelia serrulata Rydb. On plains and hills from Wyo. and Colo. 

 Alt. about 5000 ft. Denver; Ft. Collins. 



5. Grindelia perennis A. Nels. On plains and hills from Sask. and Ida. to 

 Colo. Alt. 5000-6000 ft. New Windsor; Boulder; Ft. Collins. 



6. Grindelia subincisa Greene. On hills from Colo, and N. M. Durango. 



7. Grindelia erecta A. Nels. In the mountains of Wyo. and Colo. Alt. 

 7000-10,000 ft. Near Empire; Georgetown; Huerfano Valley, near Gardner; 

 Cerro Summit; mountains between Sunshine and Ward. 



8. Grindelia subalpina Greene. In the mountains from Mont, to Colo, and 

 Utah. Boulder ; head of Lone Pine Creek. 



9. Grindelia inornata Greene. In the mountains of Colo. Canon City. 



