;>06 Mackenzie : Onosmodium 



pubescent below : bracts 12-24 mm. long, resembling the leaves 

 in outline : pedicels 3-6 mm. long (at least in fruit) : calyx-lobes 

 oblong, obtuse, 6 mm. long, hairy on both sides with short some- 

 what spreading white hairs, and more or less ciliate : corolla 10 

 mm. long, twice the length of the flowering calyx, soft-canescent 

 above outside, its lobes triangular in outHne, acute, barely 2 mm. 

 long : nutlets ovoid, obtuse or acutish, 2-3 mm. long, little if at 

 all constricted at base, but sometimes quite pitted. 



This species differs from all others known to me in the glabrous 

 stem (not branches), which strikingly differentiates it. It is con- 

 fined to the Ozark Mountain region of Missouri and Arkansas, 

 and is usually labeled *' Ouosmodinm virg'viiaiium''' in herbaria, 

 but it has no close affinity to that species. The type was col- 

 lected by B. F. Bush; _j££. ij^y near Eagle Rock, Missouri, in 

 barrens, July 11, 1897. 



Specimens examined. Missouri : type specimens ; Mackenzie, 

 28 September 1896, Eagle Rock, Barry County ; Greene County; 

 Dcwart, 3 June 1892, Potosi ; jEj^^erf, 5 June 1892, St. Francois 

 County.; J^JiLJl; 19 May 1881, \YAbi\'d TT7r lease, M Qct pber 



1S97, St. Francois County; B?^s/i^ 20 Tul v 189 1, and 12 October 



1893, Shannon County. Arkansas: Glatfeltei\ 17 July 1898, 

 Eureka Springs. 



