ShXJTION 8.] MODIFICATIOxXS OF THE TYPE. 



91 



Tabular ; when prolonged into a tube, witli little or no spreading at the 

 border", as iu tlie corolla of the Trumpet Honeysuckle, the calyx of Stra- 

 monium (Fig. 246), etc. 



261. Although sepals and petals are usually all blade or lamina (123), 

 like a sessile leaf, yet they may have a contracted aud stalk-like base, an- 

 swering to petiole. This 

 is called its Claw, in 

 Latin Unguis. Unguicu- 

 late petals are universal 

 and strongly marked in 

 the Piuk tribe, as iu 

 Soapwort (Fig. 248). 



262. Such petals, and 

 various others, may have 

 an outgrowth of the in- 

 ner face into an appendage or fringe, as iu Soapwort, and in Silene (Fig. 

 259), where it is at the junction of 

 claw aud blade. Tiiis is called a 

 Crown, or Corona. In Passion- 

 flowers (Fig. 260) the crown consists 

 of numerous threads on the base of 

 each petal. 



263. Irregular Flowers may be 

 })olypetalous, or nearly so, as in the 

 papilionaceous corolla; but most of 

 them are irregular thi-ougli coales- 

 cence, M-hich often much disguises 

 the numerical symmetry also. As 

 afFocting the corolla the following 

 forms have reoeivcd particularnames : 



264. Papilionaceous Corolla, 

 Fig. 261, 262. This is polypetalous, 

 except that two of the petals cohere, 

 usually but slightly. It belongs only 

 to the Leguminous or Pulse family. 

 The name means butterfly-like; but 

 the likeness is hardly obvious. The 

 names of the five petals of the 

 papilionareous corolla are curiously 

 incongruous. They are, 



Fig. 259. Unguinulate (clawed) petal of a Silene; with a two-])arted crown. 

 Fig. 260. A small Passion-flower, with crown of slender threads. 

 Fig. 261. Front view of a papilionaceous corolla. 262. The parts of the same, 

 displayed: s, .St.andard, or Vexillum ; v\ Wings, or A1;b ; h, Keel, or Carina. 



