148 



CITRUS FRUITS AND THEIR CULTURE. 



cupped part, the calyx. In the calyx of some flowers five 

 points may be made out (oftener only three or four) , which 

 represent the parts of the calyx, in the citrus flower fused 

 into one. These parts are each known as a sepal. The 

 calyx and corolla constitute the floral envelopes or protec- 

 tive part of the flower. 



Inside the corolla, standing up in a ring, are the 

 stamens (Fig. 35 D.). Each consists of a white stem or 

 filament, surmounted by a yellow, pointed knob, the anther. 

 If the anthers are ripe, a yellow dust, the pollen, will be 

 found on them. The stamens are usually about twenty in 

 number and the filaments are more or less united, so as 

 to form a ring. The filaments of C. trifoliata are not joined 

 together. 



Fig". 35. Vertical section through a citrus flower, enlarged about 

 two and one-half times. P, Peduncle, expanding into the calyx just 

 above. E, petals. D, Stamens. F, Filaments. A, Anther. B, Pistil. 

 S, Stigma. B, Style. O, Ovules. 



Within the ring of stamens the pistil (Fig. 35, B.) 

 rises straight up from the bottom of the flower. Its upper 

 knob-like end, the stigma, rises above, or to, the level of 

 the stamens. Below the stigma is a rather thick, straight 



