COMPOSITE. (cOMiMjSll'E FAMILY.) 19o 



to narrowly oblong and from J to f the Icugtli of the corolla. — From Mon- 

 tana to New Mexico and westward. 



Var. alpina. Gray. Dwarf, 3 to 5 inches hij^h, consisting of a rosette or 

 thick tuft of leaves with very ai)pro\iniate divisions, and naked or scapiform 

 steins, bearing mostly solitary heads, surmounting the sultterrancan hranche.H 

 of a multicipital perennial caudex or rootstock. — Synojjt, Fl. i. .'341. Alpine 

 region of the mountaius of Colorado and Wyoming, California, and uortli to 

 Washington. 



54. AC TI NELL A, Pars., Nutt. 



Low mostly herbaceous phmts : witli punctate and often resinous- atomifer- 

 ous, aromatic herbage: leaves all alternate and narrow or with narrow lobes: 

 the heads of yellow flowers commonly slender-pedunculate. 



§ 1. Involucre of numerous herbaceous or nearlij membranous nearh/ equal and 

 similar bracts, distinct to the base, heads mostli/ solilarj on lun<j ur scaiit/orm 

 peduncles, rarel/j sessile in the cluster of leaves. 



* Leaves mostl/f quite entire, all on the crowns of the caudex, which bntr a simple 



scapiform peduncle {or none): involucre villous-lanate : scales of the pajipus 

 iisualli/ produced at apex into an awn. 



1. A. SCaposa, Nutt. Looselij villous and glabrate, rather sparseh/ cespifose, 

 the branches of the caudex being slender and often ascending : scape a s/>an 

 to afoot high, occasionally leafy along the base: leaves linear to lanceolate or 

 some of the earlier ones spatulate, not rarely laciniate-lobed. — From Texas 

 and New Mexico, but extending into Colorado under the fo'lowing form: 



Var. linearis, Nutt. Leaves all narrowly linear and entire, more rigid. 



2. A. aeaulis, Nutt. Densely/ cespitose, the branches of the cauilex short, 

 thick, and crowded, canescentlij villous or sericeous, sometimes more naked : 

 leaves thickish, all entire, from spatulate to nearly linear, commonly short, 

 I inch to 2 inches long, densely crowded on the caudex : scape ^ inch to 6 

 inches high: rays 3 to 5 inches long (rarely wanting). — Mountains and tlie 

 l)orderiug plains and hills, South Dakota to Montana, and south to N»'w 

 Mexico and Arizona. 



Var. glabra, Gray. Leaves green, spatulate-linear, from sparingly villous 

 or glabrate to nearly glabrous, even to the base and axils. — Man. 363. Koiky 

 hills and bluffs, Wyoming to New Mexico and Utah. 



3. A. depressa, Torr. & Gray. Pulvinafe-cespitose : leaves densely 

 crowded on the very thick dense branches of the caudex, spatulate-linear, 

 ^ inch long, either sericeous-canesceut or glabrate : head stricthf sessile, im- 

 mersed among the long-villous bases of the leaves. — PI. Feudl. 100. Mountains 

 of W. Colorado or E. Utah. 



* * Leaves all quite entire, crowded on the cander, also scattered along the sim- 



ple or sparingli/ branched stems: peduncles slender: heads, etc., as in the lost 

 group. 



4. A. leptoclada, Gray. A span or two high, slender, sparsely and 

 loosely silky-villous, glabrate, the linear leaves and lower part of the stems 

 not rarely glabrous. — Pacif. 1? Rep. iv. 107. New Mexico and S. W. Colo- 

 rado. 



