THE FLOWEB. 



51 



loosely (Fig. 123). If the autlier is attached to the side 

 of the filament towards the pistil, it is said to be 

 introrse ; if from it, extrorse. 



63. If a siugle stamen is present, the flower is 

 said to be monandrous (Gr. monos, one ; ander, 

 stamen) ; if two stamens are present, it is dian- 

 drous ; if three, triandrous ; if four, tetran- 

 drous ; and so on. If the stamens are numerous 

 or indefinite, the flower is polyandrous. In the 12* 

 Labiate family often two of the stamens are long and 

 the other two short; they are then called didyna- 



mous (Gr. di, two; du- 

 namis, power, strong). la 

 the Crucifer family four 

 stamens are long and two 

 short (Fig. 124), and are 

 called tetradynamous 

 (Gr, tetra, four). As re- 

 gards the insertion of the 

 stamens, they are hypog- 

 ynous when attached below the pistils (Fig. 109) ; perig- 

 ynous when attached to the calyx-tube sur- 

 rounding the pistil (Fig. 110) ; and epigynous 

 ■when situated with the sepals on the ovary (Fig. 

 111). They are epipetalous when attached to 

 the corolla (Fig. 125). 



64, The pistil (Fig. 126) consists of three 

 parts: namely, the ovary (Fig. 126, ova), or 

 lower enlarged part which contains the ovules 

 or seeds; the style (Fig. 126, aty), or slender part above 



Fig, 124. Tetradynamous stamens. Fig. 125. Flowers, with stamens on the 

 corolla (epipetalous). Fjg. 120. A pistil ; eva, ovary ; mu, ovules; sty, style; stigi 

 etigma; ^la, placenta. 



