ORGANS OF REPRODUCTION. 



233 



Tlie monopetalous corolla like that of the calyx, is regular 

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

 to form a symmetrical body {fiqs. 464 — 469) ; or if these con- 

 ditions are not complied Avith, it is irregvhr {figs. 470 — 476). 



A. Regular Monopetalous Corollas. — Among these we may 

 describe the following : — 



1. Tubular, where the form is nearly cylindrical through- 

 out, as in the central florets of many Compositee, as Ragwort 

 (Senecio), Chrysanthemum (Jig. 450), and Milfoil {Ackillcea), 

 &c. (fig. 464). 



2. Campanulate or hell-shaped, when rounded at the base, and 

 gradually enlarging to the summir, so as to resemble a bell in 

 shape, as in the Harebell {fig. 465). 



3. Infundibuliform or funnel-shaped, where the shape is that 

 of an inverted cone, like a funnel, as in Convolvulus, and To- 

 bacco (Nicotiana) (fig. 466). 



Fig. 464. 



Fig. 465. 



Fig. 466. 



Fig. 464. Flower of Splfjelia marylandica. c. Calyx, t. Tubular corolla. I. 



JLimb of the corolla, s. Summit of the style and stigmas Fig. 465. 



Flower of the Harebell {Campanula rotundifoUa), showing a bell-shaped 

 corolla Fi(^. 46t>. Flower of Tobacco {Nicotiana Tabacum), with infun- 

 dibuliform corolla. 



4. Hypocrateriform or salver-shaped (fig. 467, p), when the 

 tube is long and narrow, and the limb placed at right angles to 

 it, as in Phlox, Auricula, and Primrose. 



5. Rotate or wheel-shaped, when the tube is short, and the 



