1/H 



1COSANDRIA. 



being considered too violent. Ipeca- 

 cuuuha, (Euphorbia ipecacuanha,) Fig. 

 175, is the plant, the root of which 

 affords the American Ipecac, a well 

 known emetic. Some of the species 

 of this singular genus are found in 

 nearly every country and island on 

 earth, but most of them, (Dr. Lindley 

 thinks, three eighths,) belong to the 

 equatorial regions of America. 



ORDER IV. TETRAGYNIA. Stamens 12. Styles 4. 

 This order contains nothing worthy of notice. 



ORDER V. PENTAGYNIA. Stamens 12. Styles 5. 

 This order is also barren of interesting species. 

 ORDER VI. DODECAGYNIA. Stamens 12. Styles 12. 



The name of this order comes from dodeka, and gyne, and 

 signifies 12 styles, or pistils. 



GENUS Sempervivum. Houseleek. Generic name, from 

 the Latin, semper vivere, to live forever, in allusion to the te- 

 nacity of life common to the species. This is a large genus 

 of odd looking succulent plants, of singular habits. Some of 

 them are used as ornaments, or curiosities, because they live 

 arid grow without roots. The common Houseleek, (S. tecto- 

 rum,) is said to cover the entire roofs of the houses in Smo- 

 land. The tree Houseleek, (S. arborenm,) grows eight or 

 ten feet high, has a yellow flower, and is a fine evergreen 

 shrub. 



CLASS XII. ICOSANDRIA. Stamens many, perigynous. 



Orders 3. 



The name of this class comes from 

 eikosi, twenty, and aner, a stamen, and 

 therefore signifies twenty stamens. 

 But the class includes all such plants 

 as have twenty, or more, distinct sta- 

 mens, which are perigynous, that is, 

 inserted into the calyx, not growing 

 on the receptacle. The calyx is al- 

 ways monosepalous, or consists of 

 sepals united at the base. This class 



What useful plants belong to the genus Euphorbia ? How many sta- 

 mens have plants belonging to the class Icosandria ? How are the sta- 

 mens situated ? 



Fig. M. 



