322 Nutrition and Selection. 



color of Aiiiarantiis tricolor, the variety of whose color 

 is its only claim to popularity, is dependent on external 

 conditions.^ 



Zca Mays forms more bi-sexual panicles and ears 

 when the seed has germinated at a high temperature. 

 Ranunculus bulbosus scniiplcnus (§ 22>y p. 258) forms 

 more petals if it germinates in the summer than if it 

 germinates in spring. Summer wheat can, as is well 

 known, be transformed into winter wheat by sowing it 

 in autumn, although, as it appears, only in a small pro- 

 ])ortion of individuals.- 



Amongst the cultivated Begonias we sometimes find 

 bi-sexual flowers which are the result of the appearance 

 of stamens in female flowers; in them the inferior fruits 

 become more or less completely superior and other anom- 

 alies make their appearance.'^ For the last 12 years I 

 have grown such a specimen of Begonia Sedcni (B. boli- 

 viensis X B. Pcarcci) which I have gradually multiplied 

 by dividing its tubers. In the summer of 1890 I marked 

 the tubers which produced the smallest numbers of such 

 transformed flowers and planted them out in 1891 into 

 a bed which was more richly manured and better situated 

 than the rest. As a result of this they produced a con- 

 siderably larger number of anomalous flowers than the 

 control specimens. Lnpinus lutens sometimes produces 

 twisted inflorescences.^ Seeds of such flowers collected 

 in the field and sown in the garden did not repeat the 

 anomaly ; but in the next generation it reappeared as the 



* Vilmorin-Andrieux, Lcs fleurs de pleine terre, p. 64. 



^ MoNNiER, cited by Darwin^ Variations, I, p. 333. 



^ P. Magnus, Sitzher. d. hot. Ver. d. Prov. Brandenburg, XXVI, 

 1884, p. 72, Table II, and Penzig, Teratologie, I, p. 500. 



* Monographic der Zwan^sdreJnin^cn, Jahrb. f. wiss. Bot., i8gi, 



Vol. xxiii, p. 107, PI. IX. 



