XIV I.MKODLCTION. 



64. Tho Corolla is usually of n iliiimcr texture than the calyx, ami variously 

 colored. Its leaves (PtUils), when of the same nunilier as the sepals, always 

 alternate wiili them. They aw also often nninil iiy their contiguous niur).^ins, to 

 form a umnupituious corolla 



05. When the calyx and corolla are so nearly alike as not to he readily dis- 

 tin>^uished, they are collectively termed the Ptrianth. 



66. A tlower is cowpltle when all its j)art.s arc jirescnt ; incoinpUte, when the 

 floral envelopes, or a part of tliem, are wanting ; }Kr/ict, when the stamens and 

 jjistils are borne in the same tlower ; imjKrfect, or diclinous, when they arc homo 

 in separate Howers ; regular, when the sejials or jxjtals are of nnifonn shape and 

 size; and irm/ular, when they are unlike in sha])C or size. 



67. Imperfect flowers are further distinguished into momvcions, when those fur- 

 ni.shed with stamens (staminate or sterile flowers) and those furnished with pi>tils 

 (pistillate or fertile Jlou-ers) are borne on the same plant; dinrious, when they arc 

 borne on separate plants ; and ])oli/ijniiious, when both perfect and imperfect flow- 

 ers are borne on the same or dift'erent individuals. 



68. The manner in which the parts of the floral enveloi)CS are arranged with 

 respect to each other in the bud is termed their ^Estivation. They are vallate, 

 when their contiguous margins meet, without overlapping ; iiidiiplicate, when 

 these project inwardly ; reduplicate, when they project outwardly ; imlnicattd, 

 when the margins of one overlap the adjacent margins of the two next within ; 

 convolute, or twisted, when one edge of each ]jiece covers the margin of the one 

 next before it, and the other edge is covered l)y the margin of the one next after 

 it ; and plaited, when the parts arc folded lengthwise. 



7. The Stamens. 



69. A Stamen consists of a sac, called the Anther, and, usually, a stalk, called 

 the Filament, by Avhich it is supported. 



70. They are hi/pogynous, when they are inserted on the receptacle ; perlf/i/noiis, 

 when on the calyx ; epigynous, when on the ovary ; c/njietalous, when on the co- 

 rolla; and r/i/nandrotis, when they are united with the style. They are, also, 

 often combined with each other, either into one set (momdelphous), or into two, 

 three, or more sets (diadelphous, triadelphons, &c.). 



71. The Anther is composed, commonly, of two united cells, which open in 

 various ways, and discharge a yellow, fertilizing powder, called the Pollen. The 

 part which connects the cells is the Connective. 



72. It is erect, or innate, when fixed by its base to the apex of the filament ; 

 adnate, when fixed to the filament by its whole length ; versatile, when fixed by 

 the middle to the apex of the filaments on which it turns as on a ])ivot: iutrorse, 

 when it faces inwardly toward the pistils ; and extrorse, when it faces outwardly 

 toward the petals. Occasionally, they are united into a tube (si/mjenesioiis). 



73. Between the stamens and the pistils is often a fleshy expansion, called the 



Disk. 



8. The Pistils. 



74. The Pistils occupy the centre of the flower. They are inserted, singly or 

 in a whorl, on the receptacle ; or, when this is elongated or enlarged, they cover 

 its surface. 



