&XOGENS. 149 



Myroxylon peruiferum, or source of the Balsam of Peru, 

 and many other plants having medicinal qualities, are 

 found here. 2. Ccesalpinece. Flowers irregular, but not 

 papilionaceous, petals spreading, imbricated in aestiva- 

 tion, upper one interior. Here we find the place of sev- 

 eral plants used in medicine, as various species of Cassia 

 or Senna, the Tamarind-tree, and the Logwood, (Hcema- 

 toxylon?) 3. Mimosece. Flowers regular, petals valvate 

 (without overlapping) in aestivation ; as the different 

 species of Acacia, yielding Gum Arabic, and the MimostB, 

 or Sensitive plants. 



The Rose family (ROSACE^) is also a very large one be- 

 longing to the Calyciflorece. Its sub-orders are, I.) Chrys- 

 obalancce, petals and stamens irregular, ovary stipitate, 

 its stalk adhering to the side of the calyx, style basilar, 

 fruit a i-2-celled drupe, (or fleshy fruit.) 2.) Amyg- 

 dalece, tube of calyx lined with a disk, styles terminal, 

 fruit a drupe. 3.) Spiraea, calyx-tube herbaceous, lined 

 with a disk, fruit of numerous follicles, seeds apterous. 

 4.) Quillaiece, flowers unisexual, calyx-tube herbaceous, 

 fruit capsular, seeds winged at the apex. 5.) Sangui- 

 sorbea, petals none, tube of calyx thickened and indu- 

 rated, stamens definite, nut solitary, inclosed in the 

 calycine tube. 6.) Potentillece, calyx-tube herbaceous, 

 lined with a disk which sometimes becomes fleshy, fruit 

 consisting of numerous achaenia, (small, brittle, seed-like 

 fruit.) 7.) Rosece, calyx-tube contracted at the mouth, 

 becoming fleshy, lined with a disk, and covering numer- 

 ous hairy achaenia. 8.) Pomece, tube of calyx more or 

 less globose, ovary fleshy and juicy, lined with a thin 



disk, fruit a i-5-celled, or spuriously lO-celled, pomum. 

 13* 



