APPENDAGES OF THE COROLLA. 237 
Besides the above described forms of regular and irregular 
monopetalous corollas, others also occur, some of which are but 
slight modifications of these, and arise from irregularities that 
are produced in certain parts in the progress of their development. 
Thus in the Foxglove (jig. 492), the general appearance of the 
corolla is somewhat bell-shaped, but it is longer than this form, 
Fic. 491. Fic. 492 
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Fig. 491. Ligulate corolla of the Ox-eye (Chrysanthe- 
mum). Fig. 492. Digitaliform or glove-shaped 
Me corolla of the Foxglove (Digitalis purpurea ).——Fig. 
493. Irregular rotate corolla of Speedwell ( Veronica). 
and slightly irregular, and as it has been supposed to resemble 
the finger of a glove, it has received the name of digitaliform 
or glove-shaped. In the Speedwell (fig. 493), the corolla is nearly 
rotate, but the divisions are of unequal size and shape, hence 
it may be described as irregularly rotate ; and in the Red 
Valerian the corolla is irregularly salver-shaped (jig. 495). 
APPENDAGES OF THE CoroLtA.—The corolla, like the calyx, 
whether polypetalous or monopetalous, is subject to various irre- 
gularities, arising from the expansion or growing outwards of 
one or more of the petals, or the tube of a monopetalous corolla, 
into processes or appendages of different kinds. Thus in the 
Snapdragon (fig. 488, b) and Valerian (fig. 494), the lower part 
of the tube of the corolla becomes dilated on one side, so as to 
form a little bag or sac; it is then termed saccate or gibbous, 
this term being used in the same sense as previously described 
(see page 229) when speaking of the calyx. At other times, 
one or more of the petals, or the tube of a monopetalous corolla, 
becomes prolonged downwards and forms a spur, in which case 
the petal or corolla is described as spurred or calcarate. Ex- 
amples of spurred petals or corollas may be seen in the Hearts- 
ease, Columbine (jig. 497), Toadflax (fig. 489), and Red Valerian 
