504 Mackenzie : Onosmodium 



Platte River, Denver; Engelmann, 6 August 1874, Empire; 

 dc(';ce^ July 1873^ Canon City ; Cozven, 25 June 1895. Texas: 



^j88o, Dallas, and 3 March 18S4, Industry; Lindluimer ; 



Hall, 26 May 1 872, Burton. New Mexico : Fcndlcr, 1S47. Misc. : 

 Fremont's Expedition to Rocky Mountains, 1842, 7W. 814, Walla 

 Walla to Ft. Benton ; 10 June iSSi, Long's Expedition to Mis- 

 souri River. ' 



Onosmodium occidentale sylvestre var. nov. 



An erect perennial, apparently about 10-12 dm. high, the 

 stem below the branches densely pubescent with spreading whit- 

 ish rather soft hairs 2-4 mm. long, the hairs on the branches 

 more appressed, but many of them also spreading ; branches 

 spreading or ascending at maturity, 2-3 dm. long, usually forking ; 

 leaves lanceolate, entire or slightly undulate, the main stem-leaves 

 7-10 cm. long and 2.5 cm. wide or a httle less, acute at apex, 

 tapering to the sessile or very nearly sessile base, the 3-4 pairs of 

 lateral veins prominent on both sides, the leaves papillose-hispid 

 above, softly pubescent below, especially on the veins : bracts 

 strongly 2-ranked, ovate-lanceolate or narrower, the lower 3 cm, 

 long and 12 mm. wide, the terminal ones half that size : fruiting 

 pedicels stout, 4-8 mm. long: calyx-lobes 10 mm. long, linear- 

 oblong, acutish, 3-4 tim.es the length of the nutlets, strongly 

 rather short-pubescent: late corolla 9 mm. long, short-canescent 

 outside, the tips somewhat hairy, the lobes deltoid in outline, 2 

 mm. long, acute but not acuminate : nutlets whitish, shining, 

 5 mm. long, ovate, acute, not constricted at base and little pitted. 



This variety has the aspect and habit of Onosmodiuva hispidis- 

 simtun^ but differs in its non-constricted nutlets. From typical 0. 

 occidentale it differs in its larger size, more spreading and shaggy 

 pubescence, smaller nutlets and less canescent corolla. From (7. 

 bcjaricHse it differs in its merely acute corolla-lobes and in having 

 leaves not strongly paler beneath than above, as well as in geo- 

 graphical range. It may well be specifically distinct from Onos- 

 modium occidentale, but as that species is very variable, I have con- 

 cluded to retain it as a variety merely. It seems to be confined 

 to the region around St. Louis, being found in both Illinois and 



Missouri. 



Dr. Engelniaiin on I 



1 86 1, in woods in the American bottom in Illinois opposite St. 



Miss 



Specimens examined. Illinois : type specimens ; A. 5. Hitch- 



