ORGANS OF REPRODUCTION. 



225 



The Pa'pilionaceous. — This derives its name from the fancied 

 resemblance which it bears to a butterfly. It is composed of 

 five petals, one of which is superior or posterior (fig. 435), and 

 commonly larger than the others, and termed the vexillum or 

 standard {fig. 461, v); two inferior or anterior, which are usu- 

 ally more or less united, and form a somewhat boat-shaped cavity 

 car, called the ked or carina ; and two lateral a, called the wmgs 

 or alcB. 



Fig. 460. 

 ^^K^-., 2^i^. 461. 



Fig. 460. Flower of the Rose. h. Bract, ct. Tube of the calyx, cf, cf, cf, 



cf, cf. Divisions of the calyx, p, p, p, p, p. Petals. Fig. 461. The 



Flower of the Sweet Pea (Lathyrus odoratus). c. Calyx, v. Vexillum. 

 a. A]dd or wiugs. car. Cariuaor keel. 



2. MoNOPETALors OR GrAMOPETALOiTS CoROLXA. — When the 

 petals unite so as to form a monopetalous corolla, various terms 

 are used as in the case of the monosepalous calyx to indicate the 

 degree of adhesion ; thus the corolla may hQ partite, cleft, toothed, 

 or entire, the terms being employed in the same sense as with 

 the calyx. The part also where union has taken place, is in 

 like manner called the tube, the free portion, the limb, and the 

 orifice of the tube, the throat ov faux {fig. 462). 



The monopetalous corolla, like the monosepalous calyx, is re- 

 gular when its parts are of the same size and form, and united so 

 as to form a symmetrical body {figs. 462—467); or if these con- 

 ditions are not complied with, it is irrcgidar {figs. 468 — 474). 

 Some forms of both regular and irregular monopetalous corollas 

 have received special names, as follows : — 



A. Regular Monopetalous Corollas. — Of these we may de- 

 scribe the following: — 



1. Tubidar {fig. 462), where the form is nearly cylindrical 

 throughout, as in the central florets of many Compositee, as 

 Eagwort {Senecio), Ox-eye {Chrysanthemum) {fig. 448), and 

 Milfoil {Achillea). 



2. Campamdate or bell-shaped, when the corolla is rounded at 

 the base, and gradually enlarged upwards to the sximmit, so as to 

 resemble a bell in form, as in the Harebell {fig. 463). 



Q 



