160 BOTANY. 



as long as the stigmatic ; achenia pubescent. — Oregon to California ; Colorado. 

 East Humboldt Mountains, on a peak of 10,000 feet altitude; August. (573.) 



Aplopappus lanceolatus, T. &. Gr. Glabrous or at first slightly lanu- 

 ginous ; stems 6-12' long, ascending from a deep fusiform caudex, corymbosely 

 branched towards the summit, and often with one or two longer branches 

 from below the middle ; leaves rather rigid ; the radical lanceolate, 3-5' long, 

 4-6" wide, narrowed into short petioles, sinuate-dentate or serrate ; upper 

 ones oblong, entire or serrate, the base dilated and clasping; heads 2-10, 

 9" wide when expanded; involucre turbinate-hemispherical, the sparingly 

 imbricated sub-equal scales lanceolate-oblong, slightly ciliate, greenish 

 towards the tip; rays 16-25, yellow; disk-flowers numerous; appendages of 

 the style lanceolate, about equal to the stigmatic portion ; achenia villous ; 

 pappus of unequal brownish- white scabrous capillary bristles. — Saskatchewan 

 to Oregon, Southern Wyoming and Nebraska. Clayey and alkaline meadows 

 in Northern Nevada ; 5-6,000 feet elevation ; June-August. (574.) 



Var. Vaseyi, Parry, Ms., is more condensed, and with a stouter 

 caudex; heads 3-12, rather large; the scales of the involucre broader, with 

 well-developed herbaceous tips, very unequal, and imbricated in several rows; 

 rays deep saifron -yellow. — Colorado, (273 Vasey.) Parley's Park, Utah, in 

 ' a muddy saline flat ; 6,000 feet elevation ; July. The Utah specimens have 

 a less imbricated involucre than those from Colorado, and show the necessity 

 of uniting Vasey's plant with the older species. (575.) 



Aplopappus tenuicaulis. Silky-tomentose, or at length nearly 

 glabrous ; stems 6-15' long, very slender, curved and ascending from a fusi- 

 form caudex ; leaves all narrowly lanceolate, rather rigid ; the radical 2-3' long, 

 2-3" wide, entire or sparingly denticulate, narrowed into a very short 

 petiole ; cauline ones sessile by a dilated base ; heads small, 2-6, racemose 

 on slender peduncles ; involucre hemispherical, the broadly oblong scales 

 tomentose on the back, and rather obtuse ; rays about 20, yellow ; disk- 

 flowers numerous ; hispid appendages of the style linear-lanceolate, twice as 

 long as the stigmatic portion; achenia silky-villous ; pappus white, of unequal 

 almost plumulose capillary bristles. — Alkaline meadow in Ruby Valley, 

 Nevada ; 6,000 feet elevation ; August. Near to A. lanceolatus, but suffici- 

 ently distinguished from it by the narrower and at first white-tomentose 

 leaves, the very slender stems, racemosely rather than corymbosely bra,nched, 

 and the smaller heads, with diflTerent involucral scales. (576.) 



