Studies in Onagraceae. II. Revision of North American Species of Subgenus Sphaerostigma, Genus Oenothera

Abstract

A preliminary report. A key, which is believed to be natural, is given to the species, and separate keys to the varieties of each species. Includes (all from Western U. S. A.) Oenothera minor (Sphaerostigma minus Nelson) (p. 238) with var. typica (S. minus Nelson) (p. 239); O. m. var. cusickii (p. 240); 0. alyssoides var. typica (O. a. H. & A.) (p. 242); O. decorticans var. rutila (Sphaerostigma rutilum Davidson) (p. 245); O. d. var. typica (O. d. H. &. A.) (p. 245); O. d. var. desertorum (p. 246); O. d. var. condensata (p. 247); O. boothii var. typica (O. b. Dougl.) (p. 248); O. andina var. typica (O. a. Nutt.) (p. 250); 0. a. var. hilgardii (Sphaerostigma hilgardi Greene) (p. 251); O. contorta Dougl. var. typica (0. c. Dougl.) (p. 253); O. c. var. flexuosa (Sphaerostigma contortum var. flexuosum Nelson) (p. 253); 0. c. var. strigulosa (S. strigulosum F. &. M.) (p. 255); O. c. var. epilobioides (0. strigulosa var. e. Greene) (p. 256); O. dentata var. johnstonii (p. 259); O. d. var. parishii (Sphaerostigma campestre var. p. Abrams) (p. 259); 0. hirta var. typica (0. h. Link) (p. 261); O. h. var. ignota (O. micrantha var. i. Jepson) (p. 263); O. h. var. exfoliata (Sphaerostigma micranthum var. exfoliatum Nelson) (p. 264); O. bistorta var. typica, (O. b. Nutt.) (p. 266); O. cheir-anthifolia var. typica (O. c. Hornem.) (p. 268); 0. c. var. nitida (0. n. Greene) (p. 269).