ORGANS OF REPRODUCTION. 



23/ 



are of unequal size. In the Bed Valerian (Centranthus), tlie co- 

 rolla is an irregular salver- shaped (Jig 48]), and some other 

 examples might be alluded to, hut we must now proceed to de- 

 scribe some of the anomalous forms and appendages of petals. 



Anomalous Forms and Appendages of Petals. — The 

 corolla like the calyx, whether polvpetalous or monopetalous, is 

 subject to various irregularities, arising from the expansion or 

 growing outwards of one or more of their petals into processes 

 of different kinds. Some of these we now proceed to describe. 

 Thus in the Snapdragon (Antirrhinum) (fig. 474, b), and Vale- 

 rian ( Valeriana) (fig. 480), the lower part of the tube of the co- 

 rolla becomes dilated on one side, and forms a little bag or sac, it 

 is then termed saccate or gibbous, this term being used in the same 

 sense as previously described when speaking of the calyx. At 



Fig. 480. 



Fig. 481. 



Fig. 482. 



Fig. 480. Flower of Valerian ( Valeriana'), e. Calyx, adherent to the ovary. 

 I. Limb of the calyx rolled inwards. The corolla has a projection towards 



its base, and is said to be gibbous Fig. 481. Flower of Red Valerian 



{Centranthus). The corolla is irregularly salver-shajied and spurred. — — 

 Fig. 482. A portion of the flower of the Monkshood {Aconitum), with 

 numerous stamens below, and two stalked horn shaped petals above. 



other times, one or more of the petals, or the tube of a monopeta- 

 lous corolla becomes prolonged downwards, and forms a spur, 

 in which case the corolla or individual petals are described as 

 spurred or calcarate. Examples of spurred petals or corollas 

 may be seen in the Heartsease, Columbine, Toadflax (Linaria) 

 (fig. 475), Red Valerian (Centranthus) (fig. 481), &c. The 

 Yellow Toadflax, which usually only produces one spur, in rare in- 

 stances is found with five. Such a variety was termed by Linnaeus 

 Peloria, a name which is now applied by botanists to all flowers 



