502 Mackenzie : Onosmodium 



Onosmodium hispidissimum macrospermum Mackenzie 



& Bush, var. nov. 



Differs from the type principally in the nutlets being larger 

 (4 mm. long) and shining-white ; the bracts are also larger and 

 more strongly two-ranked. 



This variety, which is often noticeably distinct, is found in Mis- 

 souri and Illinois in low rich woods or on low prairies, and never 

 on dry hills with the type. The large shining nutlets contrasted 

 with the small dull nutlets of the type are very striking. Type 



Jackson County, Missouri 



September 1895. 



Specimens examined. Missouri: type specimens; Biisl±j6^ 



ill, 7 



(collected at the same time as the 



type specimens) ; Bushjgd, 9 July 1894, Independence, and Jack 



son County, 2 August 1893. Illinois: Mead, Augusta . 



5. Onosmodium occidentale nom. nov. 



Onosuiodiuui carolimaniun violle A. Gray, Syn, Fl. 2^ : 205. 1878, 



and later American authors; not Onosmodutm molle Michx., 

 vide supra. ~ ■ 



Usually only 3-6 dm. tall, but occasionally 10-12 dm., branch- 

 ing above or often from near the base, the branches spreading or 

 almost erect ; plant clothed all over with a silvery-white or some- 

 times a slightly yellowish appressed or more or less spreading 

 canescent pubescence (in northern and mountain plants sometimes 

 quite green and noticeably spreading) usually not exceeding 2 

 mm. in length, the pubescence of the branches and leaves usually 

 appressed: leaves typically about 5 cm. long and 1.5 cm. wide, 

 acutish, prominently 5-7-nerved on both surfaces, the pubescence 

 sometimes strongly spreading and papillose, but most t}'pically 

 soft, appressed and hardly papillose : bracts 6-24 mm. long, often 

 2-ranked, resembling the leaves in outline : fruiting pedicels from 

 very short to 6 mm. long : calyx-lobes lanceolate, acute, acutish 

 or obtusish, rarely linear-oblong, 6- [2 mm. long, canescent or 

 with somewhat spreading hairs; corolla 12-20 mm. long, canes- 

 cent all over outside, the broadly triangular acute lobes (3-4 mm. 

 long) usually with apical tuft of hairs not strongly noticeable: 

 nutlets 3.5-4 mm. long, ovoid, acutish or acute, not constricted 

 at base, dull in color, little if at all pitted. 



This is the common Onosmoduun of the western part of the 

 country and the most common species in herbaria. It has here- 



