184 
2. MEGAPTEKIUM MIsSOURIENSE (Sims) Spach. 
OLEnothera Missouriensis Sims, Bot. Mag. pl. 1592. 1814. 
~OEnothera macroparpa Pursh, Fl. Am. Sept.$74. 1814.° 7 34 
~OEnothera alata Nutt. Gen. 1: 248. 1818. 
~ Megapterium Missouriense Spach, Hist. Veg. 4: 364. 1835. 
~ Megapterium Nuttallianum Spach, Hist. Veg. 4: 363. 1835. 
OEnothera Drummondi Hook. Lond. Journ. Bot.6: 221. 1847. 
OLEnothera Missouriensis var. latifolia A. Gray, Bost. Journ. Nat. 
Hist. % 188. 1856. 
OLnothera Missouriensis var. incana A. Gray, Bost. Journ. Nat. 
et Hist. sf: 189. 1856. 
Nebraska to Texas. 
3. MEGAPTERIUM DISsECTUM (A. Gray). 
OLEnothera dissecta A. Gray, Proc. Am. Acad. 17: 356. 1882. 
OLEnothera,Havardi S. Wats. Proc. Am. Acad. 20: 366. 1885. 
~ ° Western Texas and northern Mexico. 
10. TARAXIA Nutt.; Raimann in Engl. and Prantl, Nat. Pfl. 
Pam. 3: Abt. 7, 216, 18@3: 
Leaves not pinnatifid. : 
Plants hirsute, 
Plants acaulescent. 1. 7. gractlifiora, 
Plants producing several short branches. 2. 7, Palmeri. 
Plants glabrous or glabrate ; leaves lanceolate or linear. 
Leaves lanceolate ; calyx-segments linear-lanceolate. 3. T. heteranthera. 
Leaves ovate ; calyx-segments lanceolate. be Tf. ovata, 
Leaves pinnatifid. 
Sparingly pubescent; calyx-tube longer than the segments; seed: Sblontely pitted 
in rows. 5. Z. breviflora. 
Densely pubescent ; calyx-tube several times longer than the segments ; seeds con- 
spicuously pitted. 6. 7. longifiora. 
1, TARAXIA GRACILIFLORA (H. & A.) Raimann. 
Oknothera graciifiora H. & A. Bot. Beech. Voy. 341. 1841. 
Taraxia gracilifora Raimann, in Engl. & Prantl, Nat. Pf. 
Fam. 3: abt. 7,217. 1893. 
California except the extreme north; acparently also in Colo- 
rado. 
2. TARAXIA PALMERI (S. Wats.). | : 
OEnothera Palmeri S. Wats. Proc. Am. Acad. 12: 251. 1877. & 
Valleys, Arizona and southern California. 
