Mackenzie : Onosmodium 497 



Corolla-lobes acuminate, often strongly so. 



6. O, bejariense. ' 

 Stem glabrous below the branches. 7. O. subsdosiim. 



I. Onosmodium Helleri Small 



HelL 



1903. 



Perennial, 3-4 dm. high, short-pubescent all over with scat- 

 tered hairs or densely soft-pubescent on the leaves beneath ; 

 leaves obtusish, short-petioled, 8-10 cm. lon<j, 3-5 cm, wide, 

 the lower broadly spatulate and tapering to the base, the middle 

 broadly oblong-elliptical and rounded at base ; bracts broadly 

 ovate (at least the lower): fruiting pedicels 7-15 mm. long, 

 usually exceeding the sepals : calyx-lobes 7-10 mm. long, linear, 

 obtusish, ciliate : corolla not seen : nutlets obtusish, 3 mm. long, 

 ovate-orbicular, apparently not constricted at base. 



Type collected by A. A. Heller, April ^o^ 1894, along Bear 

 Creek, Kerr County, Texas, no, 1682, A flowering specimen with 

 corollas 5-7 mm. long and acute-triangular teeth pubescent out- 

 side, and generally resembling this species, Is provisionally referred 

 here, for the reason that the leaves are all merely oblanceolate or 

 spatulate, but the specimen is young and the leaves are probably 

 not fully developed. 



This species is easily distinguished from all others by the 

 characters given in the key and, in addition, by the short-petioled 

 leaves. It seems to be confined to southwestern Texas, and has 

 been rarely collected. 



Specimens examined. Texas : type specimen as cited above ; 



M 



ing specimen cited above) ; Lindhcimcr, 

 chon ij6, June 1884, Banderg^Eass. 



Never 



^ 



2. Onosmodium virginianum (L.) DC 



Lithospervuim virgiiiiamim L. Sp. PI. 132. 1753. 

 Onosvwdiinn hispidinn Michx. Fl. Bor. Am. 1 : 133. 1S03. 

 Onosinodiinn virgirnamnn K. DC Prodr. lO : JO. 1846. 

 f Onosmodhim scalmnn R. & S. Syst. 4 : 57. 181 9. 



An erect perennial, 3-4. 5 dm. high, or sometimes more, branch- 

 ing above with spreading branches ; stems and branches usually 

 shortly appressed-strigose : leaves from oblong-elliptical to nar- 

 rowly spatulate, typically 5.4 cm. long and 1.4 cm. wide, usually 

 rather strongly obtuse, but occasionally quite acute, 3-5 nerved. 



