

RUDIMENTS OP BOTANY. XV 



77. The corol or corolla consists of two or more divisions, more or 

 less coloured, called petals ; when the petals are distinct, a corol is 

 said to be polypetalous ; when they are united by the margins, it is 

 called monopetalous, (more properly gamopetalous.) 



78. When all the petals are equal, the corol is said to be regular, but 

 when they are unequal in size or cohere unequally, it is then called 

 irregular. 



79. The regular monopetalous corol varies greatly in its form, being 

 campanulate or bell-shaped, infundibuliform or funnel-shaped, rotate or 

 whed-shaped, &c. 



80. The calyx or corol are said to be labiate or bilabiate, when the 

 sepals or petals are united in one or two parcels. 



81. The papilionaceous corol consists of five petals ; the upper 

 one, usually larger than the others, is palled the vexillum or standard ; 

 the two lateral ones, the ala or wings ; and the two lower ones, 

 usually more or less united together by their lower margins, the carina 

 or keel. 



82. When the petal tapers conspicuously towards the base, it is said 

 to be unguiculate or clawed ; its lower part is called the unguis or 

 claw, its upper, the limb. 



83. The dilated apex of the pedicel, from which the floral envelopes 

 and stamens arise, is called the torus or receptacle, 



84. Whatever intervenes between the bracts and the stamens be- 

 long to the floral envelopes, and is either calyx or corol ; of which na- 

 ture are many of the organs commonly called nectaries. 



85. The manner in which the floral envelopes are arranged before 

 they expand is called their (estivation, or proqfloration. 



DISK. 



86. Whatever intervenes between the stamens and pistils receives 

 the general name of disk. 



87. The disk usually consists of an annular elevation encompassing 

 the base of the ovary ; but it sometimes appears in the form of a glan- 

 dular lining of the tube of the calyx, as in the Rose ; or of tooth like 

 hypogynous processes, as in the Cruciferse ; or of a fleshy mass, as in 

 Lamium. 



88. The disk sometimes appears to be a mere cellular expansion or 

 the torus, (83) as in Nelumbium. 



89. It is one of the parts commonly called nectary. 



STAMENS. 



90. The whorl of organs immediately within the petals is composed 

 of bodies called stamens, and they are essential to the production of 

 seed. 



91. When stamens and pistils occur in the same flower it is termed 

 perfect or hemaphrodite; but when the stamens are in one flower and 

 the pistils in another, the flowers are imperfect or diclinous. 



92. The number of stamens is variable, five or ten being the nsual 

 number among the Exogenous, and three to six among the Endogen- 

 ous plants. 



