222 Observation of the Origin of Variety. 



(§20), various kinds of pelorias according as one or 

 another form of the petals of the parent species has be- 

 come the one which prevails in the subspecies. In spur- 

 bearing species they are distinguished as Peloria nec- 

 toria and anectaria. Both possess a very low degree of 

 fertility but are, so far as is known, heritable. Peloric 

 flowers without spurs are well known in Linaria,^ An- 

 tirrhinum,- Viola,'^ Tropaeoliun,'^ etc.^ 



There are few heritable peloric races beyond those 

 which have been named. The best known are Corydalis 

 solida peloria which in Godron's experiments^' was found 

 to transmit the abnormality through a series of genera- 

 tions, and Digitalis purpurea monstrosa (Fig. 42). This 

 latter, the peloric foxglove, has been a favorite garden 

 plant for a long time, and has often been the subject of 

 morphological investigations. The oldest descriptions 

 and figuies are due to my predecessor G. Vrolik, whose 

 preparations are still to be seen in the collection at Amster- 

 dam.'*' Since his time the variety has been cultivated in 

 our botanical garden more or less regularly, and is still 

 growing there. ^ It is very constant; its peloric flowers 



^ C. Billot, Annotations a la Flore de France et d'AUemagne, 

 quoted in Bot. Zeitung, 1872, p. 278. 



''J. T. C. Ratzeburg, Animadversiones ad peloriarum indolem, 

 1825, Plate I, Figs. 64-76. 



^J. C CosTERUS, Pclories du Viola tricolor, Archiv. Neerl., Vol. 

 XXIV, p. 142, Table II; De Candolle, Organographies PL 45. 



* E. VON Freyhold, Ueher Pelorienbildung bei Tropacoluui adnn- 

 cum, Botan. Zeitung, 1872, p. 725 and Plate IX. 



"D. A. GoDRON, Mem. Acad. Stanislas, 1865 and 1868 {Delphi- 

 nium chinense, etc). 



® GoDRON, loc. cit., 1868, pp. 3-8, Cultures from 1862-68, with more 

 than fifty peloric plants. 



" G. Vrolik, Ueher cine sonderhare Wucherung der Blunien bei 

 Digitalis purpurea. Flora, i844,p. i. Plates I and II; also Fortge- 

 setzte Beohachtungen iiber die ProlHication von Digitalis purpurea, 

 Flore, 1846, p. 97, Plates I and II. 



^ The following selection of references may be of use: W. F. R. 





