412 



DE. AT. T. MASTERS ON THE FLOEAL 



ordinary stammal arrangement in this genus. The stigma, Gi, 

 "was superposed to the median fertile stamen. In a specimen of 

 C. Spicerianiun sent to me by Mr. Eraser, the three sepals were 

 free, and the an- 

 droecium was repre- 

 sented by the three 

 stamens of the inner 



Fig. 5. 



row ai, «2, az 



all 



fertile. In C. Sedeni 

 X I have also seen 

 all three stamens 

 present in the case 

 of flowers the sub- 

 ject of regular pe- 

 loria to be hereafter 

 mentioned. 



Tetraiidrous 

 Floioers, — In Uro- 

 pedium there are at 

 least four stamens 

 present, viz. Ai, as a 

 staminode, and ai, 

 a2j ad fertile. The 

 staminode in this 

 case may possibly 

 represent A 2 and A3 

 as well as Ai. Asa 

 Gray describes* a 

 tetrandrous flower 



of Cypripedium can- piower of Cyprlpedmrn Lawrenceanum, with 4-parted 

 didum ; and I have perianth and three stamens, one outer, Ai, fertde, 



two lateral, ai, ax, barren. A, flower; B, column, 

 from the front; C, column, from the back; D, 

 flower of O. Law- column, from the side, one of the staminodes, (22, 



renceanum in which ^^^o^ed. 



there were four stamens present, viz. Ai as a staminode, a\, a2 

 fertile, and az developed as a Hp, which was, as it were, slipped 

 within the cavity of the true lip, so that there were two lips one 

 within the other (figs. 6 and 7). 



In a Cypripedium sent me by Mr. Haywood there were also 



* Seemann's Journ. of Botany, iv. (1866) p. 378, 



lately examined a 



