170 LUSSOJfS WITS PLANTS 



enees in the forms of spathes, and that some of them do not en- 

 circle the spadix. Explain, also, the great head of red berries which 

 is borne by the jack -in -the -pulpit. 



1916. Observe that flowers which are enclosed in corolla-like 

 spathes are usually aohlamydeous. 



192. In all these studies of diclinous or sepa- 

 rated flowers, we have been impressed with the 

 great variety in forms of flowers and in their ar- 

 rangement. In most of the plants which we have 

 examined the two kinds of flowers are upon the 

 same plant; but in the willows and the poplars 

 and some other plants, the two kinds or sexes are 

 upon different plants, so that one plant is wholly 

 staminate and one wholly pistillate. 



192a. When staminate and pistillate flowers are borne on the 

 same plant, the plant is monoecious (word meaning "in one house"). 

 When they are on separate plants the plants are diceoious ("in two 

 houses"). 



193. In respect to the relative locations of the 

 essential organs, we can now construct a grada- 

 tion: both kinds of organs in the same flower and 

 maturing simultaneously, or synanthous (uncommon) ; 

 both in the same flower, but dichogamous (very 

 common) ; in separate flowers in the same flower- 

 cluster, or androgynous (occasional) ; in separate 

 clusters on the same plant, or plant monoecious 

 (frequent) ; upon different plants, plants dioecious 

 (occasional) ; variously mixed upon the same 



