650 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



2. Kuhnia chlotolepis Woot. & Standi. Contr. U. S. Nat. Herb. 16: 177. 1913. 



Type locality: Mangas Springs, New Mexico. Type collected by Metcalfe 

 (no. 104). 



Range: Southwestern New Mexico and adjacent Arizona and Mexico. 



New Mexico: Mangas Springs; Cliff; Alamo Viejo. Open hillsides. 



10. COLEOSANTHUS CaBS. 



Large herbs or low shrubs with opposite or alternate leaves and variously arranged 

 discoid heads of white or greenish flowers; bracts thin, striate, regularly imbricated,, 

 the outer shorter; receptacle naked; pappus a single series of capillary barbellate 

 bristles. 



KEY to the species. 



Heads 25 to 50-flowered ; plants herbaceous to the base. 



Peduncles densely glandular- viscid; heads rather small 1. C. modestus. 



Peduncles not viscid; heads large. 



Peduncles mostly shorter than the few congested 



heads 2. C. umbellatus. 



Peduncles equaling or exceeding the numerous heads. 

 Outer bracts merely acute, the inner obtuse; leaves 



acute, subcordate 3. C. avibigens. 



Outer bracts long-acuminate, the inner acute; 

 leaves various. 

 Heads few, on slender erect branches; leaves 

 attenuate, truncate or cuneate at the 



base 4. C. grandiflorus. 



Heads numerous, on stout spreading branches; 



leaves merely acute, subcordate 5. C. petioluris. 



Heads 9 to 25-flowered; plants mostly woody at the base or 

 nearly throughout. 

 Leaves sessile, or the lower short-p etiolate. 



Leaves alternate, merely scaberuloue or glabrous. 



Leaves serrate; heads axillary 6. C. brachyphyllus. 



Leaves entire; heads in terminal corymbs 7. C. linifolius. 



Leaves opposite, abundantly pubescent. 



Stems hirsute; leaves crenate 8. C. betonicciefolius. 



Stems canescent or puberulent; leaves not crenate. 

 Leaves narrowly oblong or linear; heads long- 

 pedunculate 9. C. venosus. 



Leaves lanceolate; heads on veiy short stout 



peduncles 10. C. wootoni. 



Leaves all conspicuously petiolate. 



Bracts and peduncles glandular- viscid. 



Tips of bracts spreading; heads terminating slender 

 branches covered with reduced bractlike 



leaves 11. C. scaber. 



Tips of bracts appressed; heads on short naked pe- 

 duncles. 

 Heads nearly sessile; leaves very small, 

 laciniate-toothed. 

 Leaves coriaceous, veiy viscid; heads 15 



to 18-flowered 13. C. baccharideus. 



Leaves thin, scabrous; heads 9 to 12- 



flowered 12. ft lucinitilus. 



