xvm PEEFAOE. 



one advanced by me, see, for instance, Jmjurnal of 

 Botany, Dec. 1877, p. 376. 



, I have stated (p. 13) that after inquiring from several 

 botanists I could hear of no instance, except a doubtful 

 one, of plants in an andro-dicecious condition, or existing 

 as hermaphrodite and male individuals. But H. Muller 

 {Natwe, Sept. 12, 1878, p. 159) has found on the Alps 

 Veratrwm, aTbmn, Bryas octopetcda and Getwra reptans in 

 this condition. It is an interesting fact that the corollas 

 pf the male flowers are not diminished in size like those 

 of the females of gyno-dicecious plants. Asa Gray has 

 also reason to suspect that Diospyros virginiana may 

 be andro-dioecious. 



The eighth chapter is devoted to cleistogamic flowers, 

 and I have struck out of the list there inserted four 

 genera, owing to information given me by Mr. Bentham 

 and Asa Gray. On the other hand, fifteen genera have 

 been added. Mr. Bentham informs me that the S. 

 American Trifoliwm polymorphmn produces true cleisto- 

 gamic flowers. Dalibarda, Milium and Vilfa have been 

 added to the list on the authority of A. Gray in a re- 

 view of this book in the American Jon/mal of Science. 

 The cleistogamic flowers of Danthonia are described by 

 Pringle in the American Natmralist, 1878, p. 248, and 

 those of another Gramineous genus, Diplachne, by 

 Ascherson in Sitzungsb. der Gesell. Natur. Freunde, 

 Berlin, Dec. 21, 1869. Krascheninikovia has been added 

 from some remarks made in Jowrnal of Botany, 1877, 

 p. 377. Batalin has published an essay (Act. Hort. 

 Petropol, tom. v., fasc. 2, 1878), " Kleistogamische 

 Bliithen ber Caryophylleen, namely, on Cerastium and 

 Polycarpon. F. Ludwig has described the cleistogamic 

 flowers of Collomia grandiflora in Sitzb. Bot. Vereins. 

 Brandenburg, Aug. 25, 1876 : see also on same subject 

 Scharlok in Bot. Zeitung, 1878, p. 641. A. Grisebach 



