ip* 



84 



was as favorable for the investigation of this phenomeaon by stu- 

 dents as any of the standard subjects. 



For the lack of a better name, that of '* trigger-hairs '' is given 

 to these outgrowths. This seems to be descriptive of their use, 

 for when they are touched by the slender legs of insects the im- 

 pulse is communicated to other parts, and a downward motion 

 of the anther-ring results. This Hberates a quantity of pollen at 

 a time and place when it will be most likely to get upon the 

 insect's body and be thereby transferred to some other flower. 

 The structure and the movement are undoubtedly provisions for 

 wide fertilization, and the trigger-hairs are the means by which 

 the visiting insect springs the trap and catches the pollen. 



Byron D. Halsted. 



Bibliographical Notes on well-known Plants.— VII. 



By Edward L. Greene. ^ 



Castalia and Nymph^a. 



The learned editor of the Journal of Botany has already 

 well taken the initiative in that work of readjusting the names of 

 the water-lilies, which the priority of Salisbury's monograph, 

 lately shown in this Journal t has rendered necessary. 



Several North American species, not known to Salisbury, 

 and therefore not taken up by Mr. Britten, remain to be named. 



Nymph^a polysepala. — Ntiphar polysepaium, Engelm. 

 Trans. St. Louis. Acad., ii, p. 282 (1865). 



NympH/EA RUBRODISCA. — Niiphar ruhrodismni, Morong. 

 Bot. Gaz., XI, p. 167 (1886). 



Castalia TUBEROSA.— .Vy;;^///^^ Uiherosa, Paine Catal. PL 

 Oneida, p. 184 (1865). It can scarcely be doubted that certain 

 specific names, far older than titberosa, were meant for this com- 

 monest and most widely dispersed North American water-lily ; 



Walte 



Willd 



Rafinesque; but, owing to the meagre descriptions and the lack 



* James Britten, Journ. Bot., Jan., 1888, p. 6. 



t E, L. Greene, Bull. Torr. Bot. Club, xiv, pp. 177 and 257. 



1^ 



