MUTATIONS, VARIATIONS, AND RELATIONSHIPS OF THE OENOTHERAS. 5 



As a result of the continued inspection of the culture it was seen to include 

 3 of nanella, 2 of lata, 6 of albida, and 3 of ohlonga, while the remainder could 

 not be identified. One was purely pollinated to test its relationship with 

 gigas. The coefficient of mutability in this culture was seen to be barelv 3 

 per cent, and the proportion of ohlonga was much lower than in anv other 

 culture. 



D. I. 9. — A lot of purely fertilized seeds designated as above, harvested in 

 the Xew York Botanical Garden in August, 1904, was sown in two earthen- 

 ware pans filled with sterilized soil, early in November, 1904; 604 plantlets 

 were produced ; 390 duplicates of the parental type were discarded on Decem- 

 ber 4th, 1904, and 66 on December 15th; 77 were transplanted for further 

 inspection on December 21st, and the remaining 71 on Januarv 15th, 1905; of 

 these, 59were discarded on February 9th, 33 on Februarv iSth, 15 on March 3d, 

 3 on March 21st, 5 on March 24th, and 4 on March 30th; 19 mutant individuals 

 were transplanted to the experimental garden on May i6th, 1905, of which 

 I was nancUa, 2 were lata, 2 scintillans, i albida, and 2 ohlonga, and the 

 remainder were of types not identified by the authors. 



The coefficient of mutability in this instance is seen to be about 3 per cent, 

 and that of ohlonga very small in comparison with the general frequencv of 

 this derivative. 



IDENTITY AND DISTRIBUTION OF OENOTHERA LAMARCKIANA. 

 vSince the cultures of the evening-primroses was begun, a few vears since, 

 no opportunity has bsen neglected to attempt to trace 0. lauiairkiana to its 

 original habitat and to estabhsh its relationship to other species of the genus. 

 Among numerous bibliographical discussions of interest in this connection, 

 one by Miller (1760) is of great interest. He says regarding the "Tree Prim- 

 rose with oval spear-shaped indented Leaves, and Flowers proceeding from 

 the wings of the Leaves on the Upper Part of the vStalk:" 



This plant is also a Native of North America; but was the first species of the Genus which 

 was brought to Europe, so it is more commonly seen in the Gardens than any of the other 

 species. In some parts of Europe, this is spread about from the Gardens in such plentv, 

 that it might be supposed a native there. In a small wood near Haarlem in Holland, this 

 ])lant covered the ground insomuch that niany skilful persons supposed it was a native of 

 that place. But it ma\^ be easily accounted for, because the gardeners who live near that 

 place are chiefly .lorists, and they annually change the earth of the beds in their gardens; 

 so by carrying out of their old earth from their beds, in which many of the seeds were 

 scattered, the plants came up there; and those being suffered to scatter their seeds, had 

 filled the whole wood with the plants. 



This differs from the first soit (described and figured as 0. hieunis) in having broader 

 leaves; the stalk grows taller, and the flowers are much larger. Both these sorts will thrive 

 in the Smoak of London better than most plants. 



The appended descriptions and the plate (No. 1S9, dated 1757) very fit- 

 tingly characterize 0. biennis and O. lama>-ckiana, and as the descriptions were 



