80 Elementary Work in Botany. 



nearly alike in size and shape, and exactly alike in color. 

 Frequently the sepals and petals are united by their edges 

 to form a tube or a cup. Since, in such cases, the two sets 

 of organs are together doing the same work that usually 

 done by corolla alone it is convenient to give them 

 one name. We call such flower cups perianths. The 

 adherent or adnate portion is called the perianth tube; and 

 the free parts, the perianth lobes. When the perianth 

 divisions are united, the stamens are adnate to the perianth 



tube, as shown in the figure. In 

 flowers with coherent petals the sta- 

 mens are adnate to the corolla. In 

 many flowers the calyx is adnate to 

 the pistil, forming the outer coat of 

 that organ for a part of its length. 

 The extent of this adnation varies, 

 pig. 58. perianth of triteieia ^ some flowers the calyx is adnate 



laid open, showing the pistil on 1 j_i i c 1 



a stem and the adherent sta- tO Only tile DaSC OI the OVary ] in 



mens. 



others the entire ovary is thus cov- 

 ered, and in a few it is united even to a long style for 

 nearly its whole length, as is shown in cowslip cenothera 

 (Fig. 56). Since the ovary seems to be under the flower 

 when the calyx is adherent, it is usually described as Ovary 

 inferior. It is not always easy to tell whether the ovary is 

 inferior or superior. 



Sometimes what seems to be a peduncle is an inferior 

 ovary (Fig. 59); or, as in the cenothera, an inferior style 

 also. A vertical section, as shown in Fig. 60, will gener- 



