246 



THE FLOWKR. 



of Mignonette (Fig. 377). In certain cases an analogous division 

 takes place in the opposite direction, so that the parts or lobes are 

 situated one before the other. An indication of this is also mani- 

 fest in the petals of Mignonette, the lower part or broad claw 

 of which is slightly extended at its summit, on each side, beyond 

 the origin of the many-cleft limb or blade. Division in this dfrec- 

 tion has been termed 



458. TransTCi'se or Vertical Cliorisis. The most familiar case is that 

 of the crown, or small and mostly two-lobed ap- 

 pendage on the inside of the blade of the petals 

 of Silene (Fig. 378) and of many other Caryo- 

 phyllaceous plants. This is more like a case of 

 real dedoublement or unlining, i. e. a partial sepa- 

 ration of an inner lamella from the outer, and 

 perhaps may be so viewed. Stamens sometimes 

 bear a similar and more striking appendage, as 

 in Larrea, for example (Fig. 379), and most 

 other plants of the Guaiacum family ; also in the ^^ 



Dodder (Fig. 1044). Let it be noted that in all such 

 cases the appendage occupies the inner side of the petal 

 or stamen, and that it is commonly two-lobed. Again, 

 before each petal of Parnassia (Fig. 381), although 

 slightly if at all united with it, is found a body which in 

 P. palustris is somewhat petal-like, with a considerable 

 number of lobes, and in P. Caroliniana is divided almost 

 ^^ to the base into three lobes, which look much like abortive 

 stamens. The true stam- 

 ineal circle, however, oc- 

 cupies its proper place 

 within these ambiguous 

 bodies, alternate with the 

 petals. We cannot doubt 

 that the former are of the 

 same nature as the scale 

 of the stamens in Larrea, 

 and the crown of the petals 



FIG. 378. A petal of Silene Pennsylvanica, -with its crown or appendage. 



FIG. 379. A stamen of Larrea Mexlcana, ^vith a scale-like appendage cohering ^ith Its base 

 on the inner side. 



FIG. 880. Diagram (cross-section) of the flower of Parnassia Caroliniana. 381. A petal 

 with the appendage that stands before it. 



