CALYX AND COROLLA. 



23 



(Fig. 74), which is then said to be Sinuate 

 or Undulate. The student must not fail 

 to discriminate between the entirely dif- 

 ferent senses in which these terms are 



tion, as ^displayed at b in Fig. 76, called 

 the Throat. Less frequently this term is 

 applied also to the delimiting circle be- 

 tween the limb and the tube when these 



here used, in reference to the entire calyx meet abruptly. The terminal boundary- 



and corolla, and as used previously in 

 reference to single parts thereof 



^i^M. 



no. 83. 



Fig. 66.- 



We must next consider certain specific 

 forms of the calyx and corolla as wholes, 

 which are of very great diagnostic yalue. 

 Although such characteristic forms are 

 most numerous among the coherent forms, 

 they are not wanting among those in 

 which cohesion does not exist. Sometimes 

 a non-coherent corolla will necessarily as- 

 sume such a form through the restraint 

 exercised by coherent sepals. At other 

 times the form is entirely independent 

 of such restraint. Although non-coherent 

 sepals and petals are ordinarily' free to 

 assume any position, without regard to 

 their own forms, it is clear that such is 

 not the case when cohesion exists. The 

 coalescence of such petals as that shown 

 in Fig. 18 would necessarily create a long 

 ■cylindrical tube, without regard to an en- 

 Teloping calyx, just as has actually taken 

 place in the calyx of that flower (Fig. 5l>) 

 and in that of Fig. 2G. At the same time 

 the union of the broad lobes of either of 

 those corollas would result in a funnel 

 shaped or broader upper portion, as 'm-^ 

 seen in Fig. 70. In such corollas these 

 two parts are respectively denominated 

 the Tube (a) and the Limb (c). When the 

 change from the narrow to the broad por- 

 tions of the formative divisions is noi 



line, including all its extensions and In- 

 trusions, is called the Margin. The mar- 

 gin may intrude partly or quite to the 

 tube, so thatthe cohesion may include none 

 or the whole or any part of the throat, or 

 of the limb. Some of the terms applicable 

 to the forms of the gamopetalotis corolla 

 (and, of course, to thegamosepalous calyx) 

 refer to its entire body, while others refer 

 to its several parts. The former class 

 will be first considered. The terms regu- 

 lar and irregular apply to lobes precisely 

 as though they were distinct sepals or 

 petals and to the united portions as well 

 as to the lobes. The regular forms will 

 be first considered. The term Cylindrical 

 is self-explanatory. If nearly cylindrical it 

 is called Cylindraceous. Such shapes are 

 shown in Figs. 26 and 75. If such a on<? 

 is manifestly angled, as in Mimulus (Fig. 

 70, cal.vx), it is Prismatic, and the same 



is true of other tubular forms. If the entire 

 body tlares regularly (Fig. 73). or if there 

 is sucn a tiaring portion upon a cylindrical 

 tube, it is called Infundibular or Funnel- 

 shaped. The h'ss broadened infundibular 

 forms are called Trumpet-shaped, as in 



abrupt there will be an intermediate pur- the honeysuckle. If the flaring portion 



