86 COROLLA AND STYLES. 



part of the petal inserted on the receptacle : it is long 

 or short. The corolla is regular when petals correspond 

 with each other, as in the rose and pink, and irregular 

 when they do not, as with the pea and labiate flowers. 

 This cut shows the form of the corolla and calyx as in 

 the cowslip. The form of the monopetalous corollas 

 may be bell-formed, 5 parted, and superior, as the blue- 

 Ir-^fajF' bell, etc., with the calyx ; funnel-form, as the morning 

 glory ; cap-shaped, as tobacco ; salver-shaped, as jasmine ; 

 wheel-form, as mullein, potato,etc. ; star-shaped and pitch- 

 er-shaped ; also tubular, as in primrose. 



Labiate corollas are like the lips of an animal ; they are personate 

 with the throat closed, or ringcnt with it open, or anomalous, as in the 

 fox-glove. 



The form of the polypetalous corolla may be cruciform, like a cross, 

 with 4 petals, as radish, cabbage, etc. ; caryophyllous, 5 petals, termi- 

 nating in a long claw and inclosed in a calyx, as the pink ; lilaceous, 

 with 6 petals, of a bell-form, as the lily, tulip, etc. ; rosaceous, round- 

 ing petals, without claws, as the apple, rose, etc. ; papilionaceous, 

 from the butterfly, with a banner, 2 wings and a keel, as the pea. 

 Without any of these forms a corolla is anomalous. 



The nectary is an organ of flowers which secretes honey. It is a 

 cavity in flowers provided with glands, wherever the honey is found, 

 which differs in different flowers. There is a difference of opinion as 

 to the purpose for which honey is secreted. Its extraction, however, 

 seems not to affect the flower or the plant. 



The odor of flowers arises from the volatilet oils made by or se- 

 creted in the corolla. The process is facilitated by heat, but the oils 

 are more readily dissipated by it. They are more abundant in the 

 morning, especially if the air be moist. The nature of odors differ 

 essentially in conformity with the peculiarities of the organization, 

 and the food whichwantsextract from the soil. Some are poisonous, 

 fetid, or narcotic, while others are most agreeable ; yet these qualities 

 vary with individuals, some being pleasant to one and offensive to 

 others, showing a difference in our own organization corresponding 

 with that of plants. 



The Sexes. 



These consist of stamens and pistils. The pistils generally stand 

 in the centre of the flower with the stamens surrounding them, except 

 when the sexes are on different flowers and each sex is central in its 

 own flower. They are indispensible to the perfection of fruit. They 

 generally stand on the same flower enclosed by the same envelop, or 

 upon the receptacle. They are on different flowers arising from the 



