THE COEOLLA. 



63 



(c. rosacea), when of five spreading, shortly-clawed, or sessile petals {Rose, Strawberry, 

 fig. 252) ;—^caryophyllaceous (c. caryophyllea), when of five clawed petals {Lychnis, 

 figs. 239, 240). 



The irregular polypetalous corolla is papilionaceous (c. papilionacea, Cyiisus, 

 figs. 253, 254), when composed of five petals, of which the tipper or standard 



252. Strawberry. 

 Flower. 



253. Cytisus. 

 Flower in profile. 



254. Cytisus. 

 Front view of flower. 



256.- Cytisus. Left wing. 



257. Cytisus. 

 Petals forming the keel. 



{vexillum, fig. 255) is placed next to the axis,- and encloses the four others in bud; 

 of these the two lateral wings {alee, fig. 266) cover the two lower, which are 

 contiguous, and often adhere by their lower margins, and together form the heel 

 {carina, fig. 257). 



Other irregular corollas are called anomalous (c. anomala, Aconite, Pelargonium, 

 Heartsease, fig. 170). 



Monopetalous Corollas. — In these, the tube consists of the united portions of 

 the petals, the limb is the upper or free portion, the throat {faux) is the top of the 

 tube, and is usually reduced to a circular opening, but is sometimes lengthened 

 or dilated {Comfrey, &g. 268). It must be borne in mind that the term, Km6, as 



259. Heliotrope. . 



Flower "with naked 



throat (mag*.). 



260. Heliotrope. 



Corolla laid open 



(mag:). 



261. Pulmonaiia. 



Corolla laid open 



(mag.). 



262. LycopsiS. 



Flower with bent tube 



and closed throat (mag.). 



203. Myosotis. 



Flower with closed 



throat (mag.). 



applied to the corolla, has two meanings ; being used both to designate the blade 

 of the leaf or petal, and the free upper portion above the tube of a gamopetalous 

 corolla. 



The throat is appendiculate (/. ap- 

 pendiculata) when furnished inside with, 

 and often closed by, variously formed 

 appendages, which often answer to ex- 

 ternal pits ; — it is nahed (/. nuda) wheii 

 these are absent {Heliotrope, figs. 269, 

 260) ;— it is furnished with, but not closed by, long pencils of hairs in Pulmonaria 

 (fig. 261) ;— closed by six swellings, each tipped with a pencil of hairs, and answering 



264, Myosotis. 

 Corolla laid open (mag.). 



205. Bngloss. Flower 

 with closed throat (mag.). 



