Oenothera Lamarckiana Seringe. 443 



as those of 0. biennis and agree moreover with these in 

 the amonnt of hoariness.^ 



The subgenus Onagra, to which O. Lamarckiana be- 

 longs, comprises North-American forms almost exclu- 

 sively. The various forms growing wild in Europe have 

 been imported from there. Oenothera biennis from Vir- 

 ginia about 1614, Oenothera miiricata from Canada in 

 1789 by John Hunnemann, Oenothera siiaveolcns in 

 1778 by John Fothergill.^ The first two grow abun- 

 dantly in the Netherlands, on the sand dunes which 

 stretch along the coast, where each consists, so far as I 

 am aware, of a single subspecies. They are widely dis- 

 tributed throughout Europe. O. suave olens grows wild 

 at the present time in many localities in the w^estern parts 

 of France.^ The native country of O. Lamarckiana is 

 unknown, but is probably Texas. ^ It only occurs wild 

 with us when it escapes from gardens. 



One of the characters of 0. Lamarckiana is the sym- 

 metrical floral structure, which is best seen in the sta- 

 mens.^ The flowers project sideways from the stem, 

 often almost horizontally. The stamens are inclined 

 downwards at their base; the upper ones more than the 

 low^er ones; the upper halves being more or less erect. 



*I refer the reader who is interested in a further discussion of 

 the synonymy and wants a further account of the characters of these 

 species to Sur V Introduction de I'Oenothera Lamarckiana dans Ics 

 Pays-Bas, in Nederlandsch Kruidkundig Archief, Aug. 1895. 



^W. T. AiTON, Hortus Kcwensis, 2d edition, Vol. II, 1810, p. 34i- 



^GiLLOT, Sac. Bot. France, 1893, p. 197. See also Tome III, p. 437- 



*The strain which is now being cultivated in European gardens 



was introduced from Texas about i860. See Bcr. d. dcutsch. Bot. 



Gesellschaft, 1905, Bd. XXIII, p. 382. (Note of 1908). 



^H VocHTiNG, Ueher Zygomorphie und deren Ursachcn, in 

 Pringsh. Jahrb. f. wiss. Bot, Vol. XVII, 1886, p. 311. See Plate 

 XVI, Fig. 14, in particular. For an account of geotropical curvations 

 of Ocnothera-^owtrs, see also Hanstein, Beitrdgc cur allg. Morpho- 

 logic, IV, 3, p. 151- 



