Chap. VIII. CLEISTOGAMIC FLOWERS. 311 



merged, and in this condition fertilise themselves. 

 They behave in this manner, apparently as a protec- 

 tion to their pollen, and produce open flowers when 

 exposed to the air; so that these eases seem rather 

 different from those of true cleistogamic flowers, and 

 have not been included in the list. Again, the flowers 

 of some plants which are produced very early or very 

 late in the sedson do not properly expand; and these 

 might perhaps be considered as incipiently cleisto- 

 gamic; but as they do not present any of the remark- 

 able peculiarities proper to the class, and as I have 

 not found any full record of such cases, they are not 

 entered in the list. When, however, it is believed on 

 fairly good evidence that the flowers on a plant in its 

 native country do not open at any hour of the day or 

 night, and yet set seeds capable of germination, these 

 may fairly be considered as cleistogamic, notwith- 

 standing that they present no peculiarities of struc- 

 ture. I will now give as complete a list of the genera 

 containing cleistogamic species as I have been able to 

 collect. 



Table 38. 



List of Genera including Cleistogamic Species (chiefly 

 after Kuhn).* 



DICOTYLEDONS. 



DeedalacanthuB (Acanthacese). 

 DipteTacanthus " 



JGchmanthera " 



Buellia " 



Lamium (Labiatse). 

 Salvia " 



Oxybaphus (NyctagincBB). 



DICOTYLEDONS. 



Eritrlchlum (Boiagineffi). 

 Cuscuta (Convolvnlacete). 

 ScTophulaiia (ScrophularineEB). 

 Linaria " 



Vandelll* " 



Cryphiaoanthus (Acanthacese). 

 Eranthemum " 



* I have omitted Trifolium and appear to be properly cleistogamic. 



Aiachis from the list, because Von Correa de Mello ( ' Journal Linn. 



Mohl says ('Bot. Zeitung,' 1863, Soc. Hot.' vol. xi. 1870, p. 254) 



p. 312) that the flower-stems observed plants of Arachis in 



merely draw the flowers beneath Brazil, and could never find such 



the ground, and that these do not flowers. Plantago bus been omitted 



?3 



