182 
Pachylophis caespitosa Raimann, in Eng. & Prantl, Nat. Pf. 
Fam. 3: Abt. 7, 215. 18093. 
Dakota to Idaho, south to California, New Mexico and Senora. 
7, LAVAUXIA Spach, Hist. Veg. 4: 366. 1835. 
Tips of the calyx-segments not free in the bud. 1. L. primiveris. 
Tips of the calyx-segments free in the bud, 
Leaves thinnish, very conspicuously pinnatifid. (2. L. triloba. 
Leaves thick, entire or sparingly pinnatifid near the base. 
Capsule ovoid or elliptic; testa of the seed thickened. 3. Z. drachycarpa. 
Capsule attenuate at the apex; testa of the seed not 
thickened, 4. L. Wrightit. 
I. LAVAUXIA PRIMIVERIS (A. Gray). 
OLEnothera primiveris A. Gray, Pl. Wright.2: 58. 1853. 
Texas and New Mexico. 
2. LAVAUXIA TRILOBA (Nutt.) Spach. 
OLEnothera triloba Nutt. Journ. Acad. Phila. 2: 118. 1821. 
OLnothera rhizocarpa Spreng. Syst. 2: 239. 1825. 
Lavauxia triloba Spach, Hist. Veg. 4: 367. 1835. 
Lavauxia Nuttalliana Spach, Nouv. Ann. Mus. Par. 4: 358. 
1835. 
OEnothera Roemeriana Scheele, Linnaea, 22: 1 54. 1840. 
OLEnothera clandestina Nutt.; S. Wats. Proc. Am. Acad. 8: 615. 
1873. 
Saskatchewan to Texas, California and Sonora. 
2a. LAVAUXIA TRILOBA Watson! Britton. 
OLnothera triloba(?) var. parviflora S. Wats. Proc. Am. Acad. 
12: 251. 1876. Not O. parvifiora L. 
_ Lavauxia triloba Watsoni Britton, Mem. Torr. Club, 5: 235- 
1894. 
Kansas and Nebraska. 
3. LAVAUXIA BRACHYCARPA (A, Gray) Britton. 
OEnothera brachycarpa A. Gray, Pl. Wright. 1: 70. 1852. 
OLEnothera marginata var. purpurea S. Wats. Bot. King’s Rep. 
g°%08.. 1971. : 
Lavauxia brachycarpa Britton, Mem. Torr. Club, 5: 235. 1894. = 
