COMPOSITE. (COMPOSITE FAMILY.) 193 



* * Scales of the pappus about 10, linear-lanceolate, and with a distinct rib: 



leaves all alternate and entire. 



2. B. nudicaulis, Gray. Cinereous-puberulent and glabrate, upper part 

 of the scapiform stem and involucre minutely glandular, a span or two high : 

 leaves nearly all radical, oval or spatulate-oblong, tapering into a slender peti- 

 ole : heads solitary or few and somewhat corymbosely paniculate, nearly inch 

 high: involucre of about 10 oblong bracts: rays 6 to 9, oblong: pappus fully 

 half the length of the cuneate-linear sparsely hairy akene; the thin margins of 

 the palea of the pappus erose. Proc. Am. Acad. xix. 27. Wind River 

 Mountains, N. W. Wyoming, Parry. 



3. B. oblongifolia, Gray. Smaller: stems sparsely leafy almost to the 

 3-cepha/ous naked inflorescence : leaves narrowly oblong : head only 4 lines high, 

 narrow: palese of the pappus firmer, smoother, and with entire edges, little 

 shorter than the glabrate akene Loc. cit. On the San Juan and Rio Colorado, 

 S. E. Utah or adjacent Colorado. 



* * * Leaves once or twice palmate) y or pedately divided : akenes mostly hirsute 



along the slender attenuate base. 

 +- Leaves mainly opposite : ray? none pappus of broad and very obtuse scales. 



4. B. Neo-Mexicana, Gray. A span or more high, minutely puberu- 

 lent : leaves 3 to "-parted into narrow linear divisions ; uppermost little shorter 

 than the slender peduncles: involucre of about 10 sparingly pubescent spatu- 

 late bracts . disk-corollas small, with glandular tube, almost equalled by the 

 obovate scales of the pappus, which are much thickened at and near the base. 

 Proc. Am. Acad. xix. 27. New Mexico and S. Colorado. 



-i- *- Leaves mainly alternate: rays 16 to 20, obovate-obhnq, yellow: pappus 



none. 



5. B. chrysanthemoides, Gray. Taller and stouter, 1 to 4 feet high, 

 puberulent or below glabrous, above with the flowering branches and short 

 peduncles glandular pubescent and viscid : leaves 1 to 3-ternately divided or 

 parted ; the lobes from oblong and obtuse to nearly linear : heads 5 or 6 lines 

 high and broad : bracts of the involucre 16 to 20, crowded, from oblong-lan- 

 ceolate to obovate-oblong, most of them conspicuously acuminate. Proc. 

 Am Acad. xix. 28. Villanova chrysanthemoides, Gray. Along mountain- 

 water-courses, Colorado to S Arizona. 



51. HYMENOPAPPTJS, L'Her. 



Mostly floccose-tomentose and with sulcate-angled erect stems, alternate 

 mostly 1 to 2-pinnatifid or parted leaves, and cymose or solitary pedunculate 

 heads of white or yellow flowers. 



* Flowers white ; the tube long and slender and stamens much exserted : pappus 

 of very small scales forming a crown, or obsolete : akenes puberulent : involucre 

 of partly white-petal oid bracts. 



1 H. COrymbosus, Torr. & Gray. Slender and glabrate, naked above : 

 lower leaves 2-pinnately and the small upper ones mostly simply parted into 

 narrowly linear acute divisions and lobes : heads 3 or 4 lines high : bracts of 

 the involucre shorter than the flowers, obovate-oblong, the petaloid summit 



13 



