THE FLOWER. 



completing the symmetry of the blossom ami the normal alterna- 

 tion of its members. This explanation of the anteposition of a 

 single circle of stamens is the more readily received, because it 

 well accords with the idea here adopted, that the andneeinni 

 of a typical flower should consist of two circles of stamens. 

 (":.' 4.) The only serious objections to this explanation rise out of 

 the diilieulty of applying it to analogous anteposition when both 

 circles are present. 



364. For Diplostemony^ the condition of two circles of sta- 

 mens, each of the same number as the petals. i> al-o itself very 

 commonly attended by anteposition. In normal or Direct 

 Di/tlostemony, that which answers to the floral type com- 

 pletely, the antisepalous stamens (324, note) are the outer 

 and the antipetalous the inner series, and the carpels when 

 isomerous alternate with the latter and oppose the sepals ; the 

 alternation of whorls is therefore complete, as in the diagram, 

 Fig. 382. Such stamens, however, may actually occupy a single 



line or coalesce into a 

 tube, without derange- 

 ment of the type. But 

 it as commonly occurs 

 that the antipetalous sta- 

 mens are more or less 

 exterior in insertion, and 

 then the carpels, when 

 isomerous, are alternate 

 with the inner and anti- 

 sepalous stamens, and therefore opposite the petals, as in the 

 diagram. Fig. 383. This arrangement takes the name of 

 Obdiplostemony. In it the normal alternation of successive 

 whorls is interrupted, so as to produce anteposition, 



365. With Olidiplostemony. This condition prevails, more or 

 less evidently, in Krieaeea-. ( ieraniaeea', Xygophyllacea-. Kutaeejv, 

 SaxilVagaeeie. ( Yassiilaee:e, ( )nagraecH', &c. (but in some of these 

 with exceptions of direct diplostemonv) ; also, accompanied 

 by a peculiar multiplication of members (380). in Malvacea-. 

 Stercnliaee;e, and Tiliacea-. The explanation is dillicult. The 

 hypotheses may be reduced to three, neither of which is quite 

 satisfactory. There is. first, the hypothesis of St. Hilaire. ap- 

 plied to this as to the preceding case (to Rhamnus, Vitis, &c.), 

 that these exterior antipetalous stamens belong to the corolline 

 whorl; in other words, that the petal and the stamen before it 



FIG. 382. I)i:iu'i:nn <>t i-uttern flower with direct diplostemony 383. Diagram 

 of similar flower with ubdiplostemouy. Both from Eichler's Blutlu'iuliagrainme. 



