MORPHOLOGY OF REPRODUCTIVE ORGANS 177 



2. Transverse. — This kind of dehiscence occurs in unilocu - 

 lar anthers, as in those of Alchemilla {fig. 342), Lcnina, and 

 Lavandula. It consists in the splitting open of the anther trans- 

 versely or in a horizontal direction, that is, from the connective 

 to the side. It sometimes happens that by the enlargement of 

 the connective the loculus of a one-celled anther is placed hori- 

 zontally instead of vertically, in which case the dehiscence when 

 it takes place in the line of the suture would be apparently 

 transverse, although really longitudinal. An example of this 

 kind of dehiscence is afforded by the Mallow {fig. 359), and 

 other plants belonging to the natural order Malvaceae. 



3. Porous or Apical. — This is a, mere modification of longi- 



FlG 369. 



Fig. 362. Fig. 363. 



Fiff. 359. Stamen of the Mallow (Jfalva), the anther of which has an appa- 

 rently transverse dehiscence. Fiff. 360. Two-celled anther of Pyrola 



?-oi7i«(iz/o/ja, suspended fi'om the filament,/. I. Loculi, each opening by 



a pore, p. Fig. 361. Qnadrilocular anther of Poranlhera. attached to 



filament,/. I. Locuh, each opening by a pore, p. Fitf. 362. Anther of 



Tetrathecajuncea, opening by a single pore at the apex. These figm:es are 



from Jussieu. Fiff. 363. Anther lobes of a species of Solanum, each 



opening by a pore at the apex. 



tndinal dehiscence. It is formed by the splitting down of the 

 anther-lobes being arrested at an early period so as only to pro- 

 duce pores or short slits. In such anthers there is commonly 

 no trace of the sutures to be seen externally. The pores or slits 

 may be situated either at the apex, as in the species of Solarium 

 {fig. 363) and Milkwort {fig. 341) ; or laterally, as in the Heaths 

 {fig. 356, r). There may be either two pores, as is usually the 

 case {fig. 360, p), or four as in Poranthera {fig. 361, p), or 

 many as in the Mistletoe, or only one as in Tetratheca juncea 

 {fig. 362). 



4. Valvular. — This term is applied when the whole or portions 

 of the face of the anther open like trap-doors, which are attached 

 at the top and turn back as if on a hinge. In the Barberry 

 VOL. I. N 



