CHAP. VII. SLEEP OF LEAVES. 



List of Genera (continued}. 



321 



Githago segetum (Caryophyllere). The first leaves produced 

 by young seedlings, rise up and close together at night. On a 

 rather older seedling, two young leaves stood at noon at 55 

 above the horizon, and at night at 86, so each had risen 31. 

 The angle, however, was less in some cases. Similar observations 

 were occasionally made on young leaves (for the older ones moved 

 very little) produced by nearly full-grown plants. Batalin 

 says (' Flora/ Oct. 1st, 1873, p. 437) that the young leaves of 

 Stellaria close up so completely at night that they form together 

 great buds. 



Sida (Malvaceae). The nyctitropic movements of the leaves 

 in this genus are remarkable in some respects. Batalin informs 



