196 COMPOSITE. (COMPOSITE FAMILY.) 



* * * Leaves mostly parted or dissected into narrow linear lobes, crowded on the 



thick comparatively simple caudex and scattered on the short flowering stems : 

 heads large : involucre very woolly : scales of the pappus attenuate into a subu- 

 late but hardly awned point. 



5. A. Brandegei, Porter. Leaves glabrate, with 2 or 3 lobes toward the 

 upper part, or some entire, narrowly linear, only 2 or 3 on the somewhat scapiform 

 simple flowering stem (a span or more in height) : head therefore conspicuously 

 pedunculate, $ inch high and wide : involucral bracts lanceolate : rays 12 to 16, 3 or 

 4 lines long. Gray, Proc. Am. Acad. xiii. 373. A. grandiftora, var. glabrata, 

 Porter, Fl. Colorad. 76. Alpine region of the mountains of S. Colorado. 



6. A. grandiflora, Torr. & Gray. A span or two high, very stout, floc- 

 cose-woolly, somewhat glabrate in age : stem simple or branching below, leafy : 

 leaves with petiole scarious-dilated at base, lower ones 2 to 3-ternately or quinately 

 parted, upper with 3 to 5 simple lobes : involucre about an inch broad, very 

 woolly ; its bracts linear: rays 30 or more, over ^ inch long. Alpine regions, 

 from Montana to Colorado. 



2. Involucre double or of two distinct series of coriaceous or rigid oppressed 

 bracts, the outer connate at base : leafy-stemmed and branching. 



7. A. Kichardsonii, Nutt. A span to a foot high, in tufts from a mul- 

 ticipital caudex, puberulent or nearly glabrous, woolly in the axils of radical 

 leaves, polycephalous : upper leaves mostly once and lower twice ternately 

 parted into long and simple filiform-linear lobes, rather rigid : involucre 2 or 

 3 lines high, 6 to 9-angled ; the 6 to 9 bracts of the outer strongly cariuate, 

 united for the lower quarter or third : rays broadly or sometimes narrowly 

 cuneate, 2 to 4 lines long. Plains, Saskatchewan and E. Oregon to Utah 

 and New Mexico. 



55. HELBNIUM, L. SNEEZE-WEED. 



Herbs, with alternate simple leaves, commonly resinous-atomiferous and 

 punctate, and with pedunculate heads of yellow flowers. 



* Leaves not decurrent, entire : rays long and narrow : bracts of the involucre 



numerous in two series, tardily reflexed in fruit : heads comparatively few and 

 large. 



1. H. Hoopesii, Gray. Slightly tomentose or pubescent when young, 

 soon glabrate : stem stout, 1 to 3 feet high, leafy, bearing several or sometimes 

 solitary large heads : leaves thickish, oblong-lanceolate, or the lower spatulate 

 with long tapering base : rays becoming an inch long, tardily reflexed : disk 

 ^ to f inch high, hemispherical : scales of the pappus ovate-lanceolate, long 

 attenuate-acuminate, a little shorter than the corolla. Proc. Acad. Philad. 

 1863, 65. Mountains of Montana to New Mexico, Arizona, and California. 



* * Stem ivinged by the decurrent serrate or denticulate leaves : rays cuneate or 



oblong, soon drooping : ini'o/iicre small and simple, of linear or subulate bracts, 

 soon reflexed : heads more numerous (corymbose) and smaller. 



2. H. autumnale, L. Nearly glabrous or minutely pubescent: stem 

 very leafy, narrowly winged, 2 to 6 feet high : leaves lanceolate to ovate- 

 oblong : heads about ^ inch in diameter, usually equalled by the rays : pappus 



