222 MOKPHOLOG Y. 



442. Corolla. — Next above the calyx is a whorl of white or 



Trillium grandiflorum, which 

 and broader than the sepals, 

 broader at the free end. These 

 corolla in the higher plants, 

 corolla is a petal. But while 

 flower, and are not green, 

 tion would suggest that they 

 series. 



Within and above the inser- 

 found another tier, or whorl, 

 at first sight resemble leaA-es in 

 in the higher plants as stamens. 

 stamen possesses a stalk (= fil- 

 along on either side for the 

 are four ridges, two on each 

 stamen is the anther, and the 

 sacs, or lobes, 

 opened, these an- 

 split in the wall 

 ridge. At this 

 Fig. 290. yellowish powder 



Trillium grandiflorum. ruptured anther 



pinkish members, in 

 are also leaf-like in form, 

 being usually somewhat 

 make up what is the 

 and each member of the 

 they are parts of the 

 their form and posi- 

 also belong to the leaf 

 443. Androecium. — 

 tion of the corolla is 

 of members which do not 

 form. They are known 

 As seen in fig. 291 each 

 ament), and extending 

 greater part of the length 

 side. This part of the 

 ridges form the anther 

 Soon after the flower is 

 ther sacs open also by a 

 along the edge of the 

 time we see quantities of 

 or dust escaping from the 

 locules. If we place some of this under the microscope we see 



