204 



POLYPETALOUS COROLLAS. 



many Malvaceae with twisted aestivation, the corolla is regular. The 

 size of the corolla as compared with the calyx, the number, direction, 

 and form of its parts, and their relation to the axis of the plant, 

 require attention. 



When a corolla is gamopetalous, it usually happens that the claws 

 are united into a tube (figs. 311 t, 312 i), while the upper parts are 

 either free or partially united, so as to form a common limb (fig. 311 I), 

 the two portions being separated by the faux or throat, which often 

 exhibits a distinct constriction or dilatation. The number of parts 

 forming such a corolla can be determined by the divisions, whether 

 existing as teeth, crenations, fissures, or partitions ; or if, as rarely 



Fig. 313. Fig. 3U. 



happens, the corolla is entire, by the venation. The union may be 

 equal among the parts, or some may unite more than others. Some- 

 times the tubular portion is bent, as in 

 Lycopsis ; at other times the limb is 

 curved at its apex, as in Lamium. 



EEGtrLAE PoLYPETALOUS OoEOLLAS. 



— Among them may be noticed the rosa- 

 ceous corolla, in which there are five 

 spreading petals, having ho claws, and 

 arranged as in the single Eose (fig. 313) 

 and Potentilla ; the caryophyllaceous co- 

 rolla, in which there are five petals with 

 long narrow tapering claws, as in many 



Fig. 313. Polypetalous flower of Rosa rabiginosa, the Sweet-brier, t, Bract or floral 

 leaf, ct, Hollow torus, which forms the conspicuous part of what is commonly called the 

 fruit, cf, cf, cf, cf, cf. Sepals or foliola of the calyx, ppvp. Petals without a claw, e, 

 Stamens attached to the calyx Fig. 314. Polypetalous flower of Dianthus monspessu- 

 lauus. &, Bracts, c, Calyx. ^ j), Petals with their claws, o, approximated so as to form a 

 tube. Pig. 815. Cruciferous flower of Cheiranthus Cheiri, Wallflower, c. Lobes of the 

 sepjils ; the two external sepals being prolonged at the base, so as to form a sort of spur or 

 swelling (gibbons or saccate), pp. The four petals arranged lilie a cross, e. The four longer 

 stamens, the summits of the anthers being visible. 



Fig. 315. 



