The Flower. 103 



perfect or unisexual (u'-ni-sex'-ual).* Flowers of the 

 latter class are called monoecious when the stamen-bear- 

 ing (staminate (stam'-i-nate) ) and pistil-bearing (pis- 

 tillate (pis'-til-late)) flowers are both produced on the 

 same plant, and dioecious when produced on different 

 plants only, as in the hop and date. In a few plants', 

 as the strawberry (154) and asparagus, some individu- 

 als produce perfect, and some imperfect flowers. 



154. Planting with Reference to Pollination is im- 

 portant in certain plants. All direcious plants (153) 

 intended for seed or fruit must have staminate and pis- 

 tillate plants growing 

 near together or they 

 will not be productive. 

 The hop plant, persim- 

 mon and date palm are 

 of this class. 



Fi G5 Imperfect flqw?r' "' the The fl WerS f manv 

 St F a iG. b 57. ry 'Perfect flower of same. of our most productive 



Jirc'uiaT mlss u \t p \h e 1 %e a n p t lr ear ar 1 ound varieties of strawberry 

 F ch 57. th( seen in yield little or no pollen 



and are unproductive, unless growing near pollen-bear- 

 ing sorts (Figs. 56, 57). In many varieties of Ameri- 

 can plums and in certain varieties of the pear and 

 apple, the pollen, even though produced freely, is in- 

 fertile on stigmas of the same variety. To insure fec- 

 undation, it is wise to mingle varieties in fruit planta- 

 tions rather than to plant large blocks of a single 

 variety. 



* The terms hermaphrodite, unisexual and bisexual, though 

 often applied to flowers, are inaccurate. 



