592 



BOTANY 



relation to their mode of life, and the situations they occupy in the most rapid 

 currents and waterfalls of rivers and streams in the tropics. 



Family 1. Crassulaceae. Succulent ( w ) herbs or under-shrubs with cymose in- 

 florescences. Flowers hermaphrodite, with calyx and corolla consisting of a variable 

 number of members. Obdiplostemonous or haplostemonous. Carpels free (Fig. 618)' 



a ft 



FIG. 618. Sedum TelepMum. a, Flower ; b, flower in longitudinal section. ( x 4.) 



flower hypogynous or perigynous. Scale-like nectaries at the base of the carpels. 

 Fruit a capsule containing numerous seeds with a small amount of endosperm. 



MORE IMPORTANT GENERA. Sedum with pentamerous flowers ; there are a 

 number of British species. Sempervivum, flowers with from six to an indefinite 

 number of whorls ; S. tectorum. Bryophyllum with tetramerous flowers, note- 



Kit;. 610. Kibet ritbrum. ( nat. size.) 



worthy on account of the abundant formation of buds in the indentations ot the 

 margin of the leaf. Crassula. 



Family 2. Saxifragaeeae ( 26 ). Herbs or woody plants with 

 alternate leaves. Flowers hermaphrodite, obdiplostemonous, tetra- 



