654 CONTEIBUTIOlSrS FEOM THE NATIONAL HEEBAEIUM. 



KEY TO THE SPECIES. 



Heads discoid. 



Leaves merely dentate 1. G. aphanactis. 



Leaves laciniately toothed, the lower ones pinnatifid with 



dentate segments 2. G. pinnatifida. 



Heads radiate. 



Peduncles pubescent 3. G. scabra. 



Peduncles glabrous. 



Pappus awns conspicuously barbellate 4. G. subalpina. 



Pappus awns smooth except under a compound micro- 

 scope. 

 Tips of the outer bracts spreading, none reflexed. 

 Disk about 20 mm. broad; cauline leaves ovate 



to obovate 5. G. arizonica. 



Disk 12 mm. broad or less; cauline leaves ob- 

 lanceolate. 

 Leaves conspicuously spinulose-toothed; 



bracts scarcely at all viscid 6. G. setulifera. 



Leaves not spinulose-toothed; bracts strongly 



viscid 7. G. decumbens. 



Tips of the outer bracts squarrose, those of the outer- 

 most strongly reflexed. 

 Cauline leaves ovate or oblong, broadest at the 

 base; tijjs of the bracts subulate. 

 Leaves bluish green, spinulose-dentate; heads 

 very broad and flat, the bracts broad, 



with flattened tips 8. G. texana. 



Leaves yellowish green, merely dentate; 

 heads hemispheric, the bracts narrow, 



with terete tips 9. G. squarrosa. 



Cauline leaves narrowly oblong or oblanceolate, 



not broadest at the base; tips of the bracts 



flat, never subulate. 



Leaves coarsely and irregularly incised- 



toothed; heads densely viscid, 15 mm. 



wide or smaller 10. G. subincisa. 



Leaves evenly and finely serrate; heads vari- 

 ous. 

 Bracts abundantly viscid, the tips nar- 

 row and thick, strongly reflexed. 11. G. serrulata. 

 Bracts scarcely at all viscid, the tips 



broad and flat, slightly reflexed. .12. G. neomexicana. 



1. Grindelia aphanactis Rydb. Bull. Torrey Club 31: 647. 1904. 

 Type locality: Durango, Colorado. 



Range: Southern Colorado to Arizona and New Mexico. 



New Mexico: Farmington; Dulce; Santa Fe; Glorieta; Ramah; Watrous; Pajarito 

 Park; Gallinas Planting Station; Raton Mountains; Gallup; Belen; Socorro; Laguna; 

 Albuquerque; Mesilla Valley; Organ Mountains; White Oaks; Roswell; Lake Valley. 

 Plains and low hills, in the Lower and Upper Sonoran zones. 



2. Grindelia pinnatifida Woot. & Standi. Contr. U. S. Nat. Herb. 16: 178. 1913. 

 Type locality: Open slopes about Chama, New Mexico. Type collected by 



Standley (no. 6606). 

 Range: Vicinity of the type locality, in the Upper Sonoran and Transition zones. 



