184 REPRODUCTIVE APPENDAGES. CHAP. IV. 



monopetalous corolla, as in Lamium. The spur, 

 being a spur-shaped process issuing immediately 

 from the corolla, as in Orchis ; or supported upon 

 a proper pedicle, as in Aconitum. The slipper, 

 being a petaloid process issuing from the corolla, 

 and inflated in the form of a slipper, as in Cypri- 

 pedium. 



Presumed Of appendages presumed, from analogy, to be 

 ' nectaries, but not certainly known to be so, the fol- 

 lowing species are the most distinguishable. 1 . The 

 vault) being a small and flattened but somewhat 

 convex process, or several such processes conjoined, 

 originating at the orifice of a monopetalous and 

 tubular corolla, and forming a sort of arch or vault 

 which encloses or covers the stamens, as in common 

 Comfrey and Alkanet. 2. The beard, being a tuft of 

 fine hairs or bristles issuing in most cases from the 

 calyx or corolla; but sometimes from other parts of 

 the flower also, as in Thymus, Iris, Periploca. 3. The 

 corollet, being a petaloid process of one or more 

 pieces surmounting the corolla in the form of a lit- 

 tle crown. In Narcissus it consists of one piece, 

 which is somewhat bell-shaped, investing the 

 stamens. In Silene it consists of several pieces is- 

 suing individually from the upper extremity of the 

 claw of each of the petals. 4. Threads, being long 

 and slender processes issuing in great numbers from 

 the base or receptacle of the flower, somewhat re- 

 sembling the filaments of the stamens. In the 

 Passion-flower they issue from the base of the pistil 



