COMPOSTTiE. (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-puberulcnt and glabrate, upper part 

 of the scapiforra 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, nearhj £ Inch 

 high: involucre of about 10 oblong bracts: rays 6 to 9, oblong: pappus full;) 

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

 the paleae 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-cephalous naked inflorescence: leaves narrowly oblong: head only 4 lines high, 

 narrow : paleae 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 palmately or pedately divided : akenes mostly hirsute 



along the slender attenuate base. 

 4- Leaves mainly opposite : rays none r pappus of broad and very obtuse scales. 



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

 lent : leaves 3 to 7-parted into narrow linear divisions ; uppermost little shorter 

 than the slender peduncles : involucre of about 1 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. 



+- •*- Leaves mainly alternate: rays 16 to 20, obovate-oblong, 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. HYMENOPAPPITS, L'Her. 



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

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

 heads of white or yellow flowers 



* Flowers white ; the tube long and slender and stamens muck 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 



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