592 Heller: Plants from Western North America 



Dr. D. T. M 



LcDougal's no. 390, collected on "dry inner 

 slopes of crater of San Francisco mountain/' near Flagstaff, 

 Arizona. The type specimen is deposited in the herbarium of the 

 New York Botanical Garden. 



A species related to E. Jh 



weaker, 



more prostrate, simple, downcurved stems, scape-like peduncles, 

 minute leaves, and more pubescent involucre. It is very unlike 



/ 



MacDougal 



Perennial, stems rather slender, 4 dm. high, corymbosely 

 branched from near the base, glabrous, leafy throughout : leaves 

 2-pinnatifid, 2-4 cm. long, the lower slightly petioled, the others 

 sessile, the segments oblong, acute, i cm. long, 1-2 mm. wide, the 

 lower ones lobed, the upper ones usually entire ; rachis broad for 

 the size of the leaf: heads numerous in corymbs, slender-pedun- 



v-i^^i, C1U..UI j iiiiii. uioau ana 7 mm. nign : mvolucre 5 mm. high, 

 the lobes linear-lanceolate, strongly costatc, somewhat spreading' 

 tipped with a brown ciliate point ; rasys bright yellow, about 2 

 nun. broad : achenes glabrous : pappu white. 



Dr. D. T. MacDougal's no. 342, collected near Flagstaff, 

 Arizona, July 25, 1898. The type specimen is deposited in the 

 Jierbarium of the New York Botanical Garden. ' 



This species is related to .S". crcmopJiilus, but is smaller in every 

 way. One difference which strikes the eye at once is the smaller 

 narrower heads. The leaves are also shorter. It was found 

 growing In clumps in remains of decayed pine trunks." Profes- 

 sor E. O. Wooton has collected specimens of this species in south- 

 eastern New Mexico. 



The Genus Petalostemon 

 In April, 1896, the writer published a paper in the Bulletin 

 entitled " Notes on Knhnistcmr In its inception, the idea was to 

 keep separate under the generic name Kuhnistera, the Atlantic sea- 

 board and Gulf coast plant long known as Pctalostoium coryitihosus 



a 



it being the type of Kuhnistera. Finally, though somewhat un- 

 willingly, he was led to adopt the single genus theory, and in- 

 cluded all of the species under Kuhnistera. Although there are 

 several species of Petalostemon which have rather long calyx-lobes 

 or broad floral bracts, they are so utterly unlike the peculiar plant 



