TO BOTAXV. 1GI 



Hedysaruift*, there are many species distinguishable 

 by the angles of the stem ; and in Lupinus, the species 

 are not easy to be known, except by the same part be- 

 ing simple or compound. In Eriocaulon, the most re- 

 markable difference is in the culmus, which is quin- 

 quangular, hexangular, decangular, &c. In Pyrola, 

 some species are distinguished by a triquetrous sea- 

 pus. In Citrus, the Aurantium is distinguished from 

 its congeners by its petioles, which are winged or 

 increased by a membrane on each side; and in 

 Gomphrena, there is a species f distinguished by its 

 peduncles which are diphyllous, being furnished 

 with two opposite folioies that are placed under the 

 head of the flowers. 



The LEAVES exhibit most natural and also most 

 elegant specific differences. These have been so 

 amply treated of already, that it would be only re- 

 petition to particularize or exemplify the numerous 

 cases that occur of such distinctions. 



FULCRA are generally a good mark of distinction, 

 and must be carefully attended to by the Botanist 

 for the "determination of the species; as we siuiii 

 shew by many examples, where the difference con- 

 sists principally in those parts of the plant. Thus, ' 



Aculei are remarkable in Ilubus. 



Spines in Primus. 



liracteae in Furnaria, Dracocephalon, and the In- 

 dian species of liedysarum ; to which must be added 

 the Coma, which is a bushy head, composed of brae- 

 teae that are of a large size, and terminate the stem 

 .hi Corona imperial is, Lavandula and Salvia. 



Glandules furnish the essential mark in Pad us, 

 Urcna, Mimosa, Cassia, and many other genera, 

 which it would be impossible to distinguish without 



* liedysarum triquetrum (Lin. Spec, plant. 746.) caule 

 triquetro. 



t Gomphrena globosa (Lin, Spec, plant.) 

 L 



