80 PLANTS OF MASSACHUSETTS. 



ORDER 131. PASSIFLORE.E. The Passion Flower 



Tribe. 



Calyx of 5 sepals, and corolla of 5 petals on the calyx, and 

 without the filamentose or annular processes which rise from the 

 throat of the calyx ; stamens 5, monadelphous, surrounding the 

 stalk which supports the superior ovary ; styles 3, club-form, 

 with a dilated stigma ; usually climbing ; leaves alternate and stip- 

 ulate. The anthers, movable on their filaments, thus bring the 

 pollen in contact with the stigma. 



The flowers are often very beautiful, and the whole plant also ; 

 some bear fruit which is sourish, pleasant, and healthful. Gen- 

 erally the properties are of little value. 



Passiflora. L. 15. 5. Passion Flower. 

 Two species are often cultivated in gardens. 

 P. ccerulea. W. Blue-flowered, from Brazil. 



P. alata. W. Wing-stemmed, from the West Indies. 



Two are natives of the United States from Pennsylvania to 

 Florida ; about 50 species are found in tropical America ; one 

 in Norfolk Island, and one in New Holland ; not one in the 

 eastern continent. 



ORDER 134. CISTINEiE. The Rock Rose Tribe. 



This order was united with Violaceae, from which it much dif- 

 fers, and some of the genera greatly in appearance, which are yet 

 retained in this order by Lindley. Only 3 genera found in 

 this country and State, and only one of these herbaceous. 



Calyx of 5 persistent unequal sepals continuous with the 

 flower-stalk, containing 5 fugitive, hypogynous petals ; stamens 

 indefinite ; ovary superior ; flowers often in unilateral racemes. 

 Chiefly inhabit South of Europe, North of Africa, and South 

 America. 



Cistus, from which the order is named, and Hudsonia, will be 

 described under the shrubs. 



