84 BOTANICAL GAZETTE [febeuary 



0. biennis var. leptomeres,'"' and once in, a cross between this variety 

 and typical Oenothera biennis, from which var. leptomeres itself 

 doubtless arose by mutation. Stomps has also described 0. 

 biennis mut. semigigas from the same culture of 0. biennis var. 

 leptomeresXO. biennis which gave rise to the dwarf. A recent 

 letter from Professor De Veies (dated May i6, 1914) states 

 that mutations from 0. biennis are still being obtained at 

 Amsterdam. 



Stomps" has just published a second report on mutations in 0. 

 biennis. He records the origin by mutation, in a pure line, of 

 O. biennis var. sulfur ea De V. (long known as a wild component of 

 the Dutch flora), together with mut. nanella and mut. semigigas. 

 Gates" has likewise annoimced the discovery of mutations (0. 

 biennis lata, 0. biennis laevifolia, 0. biennis rubrinervis) from 0. 

 biennis, but has not yet pubHshed a full account of his cultures.'^ 

 Finally, De Vries has obtained two different mutations, 0. salici- 

 folia and O. salicastrum, from wild seed of a strain of the self- 

 pollinating 0. biennis "Chicago" which he collected near Courtney, 

 Missouri; and the writer"* has given a preliminary account of 

 Oenothera stenomeres mut. lasiopetala,^^ a hairy-petaled derivative 

 of one of the small-flowered cruciate Onagras. 



^"Oenothera biennis var. leptomeres Bartlett. Amer. Jour. Bot. 1:242. 1914 = 

 Oenothera biennis var. cruciata De Vries, not T. & G. 



" Stomps, Theo. J., Parallele Mutationen bei Oenothera biennis L. Ber. Deutsch. 

 Bot. Gesells. 32:179-188. 1914. 



"Gates, R. R., Parallel mutations in Oenothera biennis. Nature 89:659-660. 

 1912. 



'3 Since the above was written, an account of the cytology of O. biennis mut. lata 

 has been received. See Gates, R. R., and Thomas, Nesta, A cytological study of 

 Oenothera mut. lata and 0. mut. semilata in relation to mutation. Quar. Jour. 

 Micr. Sci. 39:523-571- I9i4- 



■'' Bartlett, H. H., An account of the cruciate-flowered Oenotheras of the sub- 

 genus OMagra. Amer. Jour. Bot. 1:226-243. 1914- 



« By an unfortunate oversight this name was pubhshed in Amer. Jour. Bot. as 

 0. stenopetala mut. lasiopetala. The writer had originally used the name O. stenopetala 

 for the species which was described as 0. stenomeres. After the manuscript had been 

 submitted to the editor, a change was made necessary by the publication of O. steno- 

 petala Bicknell, Bull. Torr. Bot. Club 41 : 79. 1914. In one place the original name 

 escaped notice and was not corrected. It is hoped that the error will not lead to any 

 confusion. 



