278 



Gates. 



Gates, R. R. 1912b. Mutations in plants. But. Journal 2. pp. 84 — 87. 



— 1913 a. A contribution to a knowledge of the mutating Oenotheras. Trans. 

 Linnean Soc. 2"d. Ser. Botany 8 Pt. I, pp. 1—67, pis. i — 6. 



— 1913 b. Tetraploid mutants and chromosome mechanisms. Biol. Centralbl. 

 33, pp. 92— 99, 113 — 150. figs. 7. 



— 1913c. Oenothera and climate. Science N. S. 37, pp. 155 — 156. 

 GoLDSCHMiDT, R. 1912. Die Merogonie der OcHo//ipra -Bastarde und die doppelt- 

 reziproken Bastarde von de Vries. Arch. f. Zellforsch. 9. pp. 331 — 344, figs. 6. 



Heribert-Nilsson, N. 191 2. Die Variabilität der Üenolhera Lamai Chiana und das 

 Problem der Mutation. Zeitschr. f. Abst.- u. Vererbungslehre 8, pp. 89 — 231, 

 pis. 3—5, figs. 36. 



JoHANNSEN, W. 1908. Über Knospenmutation bei PJui^eolm. Zeitschr. f. ind. Abst.- 

 u. Vererbungslehre 1, pp. i — lo, figs. 2. 



MacDougal, D. T., Vail, A. M. and Shull, G. H. 1907. Mutations, Variations and 

 relationships of the Oenotheras. Carnegie Inst. Publ. Si, pp.92, pis. 22, figs. 73. 



Macfarlane, J. Muirhead. 1895. A comparison of the minute structure of plant 

 hybrids with that of their parents, and its bearing on biological problems. 

 Trans. Roy. Soc. Edinburgh. 37. pp. 203 — 283, pis. i— 8. 



Nilsson-Ehle. H. 1909. Kreuzungsuntersuchungen an Hafer und Weizen. Disser- 

 tation-Lund, pp. 122. 



— 191 1. Über Entstehung scliarf abweichender Merkmale aus Kreuzung gleich- 

 artiger Formen beim Weizen. Ber. d. d. Bot. Gesells. 29, pp. 65 — 69. 



Stomps, Theo. J. 1912. Mutation bei Oenothera biennis L. Biolog. Centralbl. 32, 



pp. 521 — 535, pl. 1, fig. I. 

 Tammes, Tine. igii. Das Verhalten fluktuierend variierender Merkmale bei der 



Bastardierung. Recueil Trav. bot. Neerlandais 8, pp. 201 — 288, pis. 3 — 5. 



VI. Explanation of figures. 



Fig. 1. Oenothera grandiflora SoLANDER from DLxie landing, Alcibama. Young seed- 

 lings in various stages of deveUjpment. In the younger stages they are 

 scarcely distinguishable from O. Lamarckiana. 

 „ 2. The same at a later date showing the range of variability. The leaves of 

 the largest rosettes have red blotches on the surface, and a tendency to 

 produce basal lobes. Two of the plants, marked a and b. are obviously 

 different from the rest and are probably mutants. 

 „ 3. The same, full grown, in the chmate of St. Louis, Mo. Note bushy aspect 

 and absence of a rosette. 



4. The same, grown in the climate of England. Stem cut off about a foot 

 above ground. Side branches extend nearly to the ground. Cf. fig. 3. 



5. Buds of O. gran<iif!or,i. two-thirds natural size, fnmi the St. Louis cultures. 

 Cf. fig. 9- 



6. Rosette of the Birkenhead race of O. grandiflora, used in some of the crosses. 



7. Young plant of the same race as last, showing complete omission of rosette 

 stage, as frequently occurs in O. grnndiflora 



8. Rosette of 0. mut. rubricnlyx, showing shape and crinkling of leaves. Cf. fig. 2 

 and 6. 



9. Buds of O. nibricalyx photographed two-thirds natural size. The pubescence 

 does not show. Cf. fig. 5. 



10. Full-grown plant of O. nihricalyx. Cf. figs. 3 and 4. 



11. F, rosette, July 5, from O. grandiflora Solander from Alabama :■', 0. mut. 

 n.brirulvx. Cf. figs. 2. 6, 8. 



