98 



STAMENS. 



[SECTION 9. 



it, while its other edge is covered by the next beliiud it. The other mode 

 is the 



Imbricate or Imbricated, in which the outer parts cover or overlap the 

 inner so as to " break joints," like tiles 

 or shingles on a roof; whence the name. 

 When the parts are tliree, the fust or 

 outermost is wholly external, the tliird 

 wholly internal, the second has one 

 28Q margin covered by the first while the 



other overlaps tlie tliird or innermost 

 piece : this is the arrnngement of alternate three- 

 ranked leaves (187). When there are five pieces, as in the corolla of Fig. 

 225, and calyx of Fig. 281, as also of Fig. 241, 270, two are external, 

 two are internal, and one (the third in the spiral) has one edge covered 

 by the outermost, while its otlicr edge covers the in- 

 nermost; v/hich is just the five-ranked arrangement of 

 alternate leaves (ISS). When the pieces are four, two 

 are outer and two are inner; which answers to the ar- 

 rangement of opposite leaves. 



279. The imbricate and the convolute modes some- 

 times vary one into the other, especially in the corolla. 



280. In a gamopetalous corolla or gamosepalous calyx, 

 the shape of the tube in the bud may sometimes be notice- 

 able. It may be 



Plicate or Plaited, tliat is, folded lengthwise ; and the 

 jjlaits may either be turned outwards, forming projecting 

 ridges, as in the corolla of Campanula; or turned in- 

 wards, as in that of Gentian Belladonna ; or 



Supervolute, M^ien the yilaif.'! are convolutoly wrapped 

 round each other, as in the corolla of Morning Glory and of Stramonium, 

 Fig. 282. 



Sectfon IX. STAMENS IN PARTICULAR. 



281. Androecium is a technical name for the staminate system ot » 

 flower (that is, for tlie stamens taken togetlier), which it is sometimes con- 

 venient to use. The preceding section has dealt with modifications of the 

 flower pertaining mainly to calyx and corolla. Those relating to the sta- 

 mens are now to be indicated. First as to 



Fig. 280. Convolute se.stivation, a.s in the corolla-lohes of Oleander. 



Fio. 281. Diagram of a Flax-flower ; calyx imbricated and corolla convolute in 

 tJie hud. 



Fio. 282. Upper part of corolla of Datura Stramonium in the bud ; and below 

 a section showing the convolution of the plait.s. 



