APPENDIX; 



In which the British Genera are referred to llieir respective 

 Natural Orders. Togetlier with brief characters of these Orders 

 is given, but always included between hooks ( ), and in a smaller 

 type, a list of some of the more useful and interesting exotic 

 plants, under their respective families. The characters of all 

 these will be found in the xxvth chapter of the 7th edition of 

 *' Smith's Litrodiiction to Botany." 



According to the method in question, all plants are primarily 

 divided into three Classes : I. Dicotyledonous, or Vascular 

 and Exogenous Plants; II. Monocotyledonous, or Vas- 

 cular and Endogenous; and III. Acotyledonous, or Cel- 

 lular. 



Class I. DICOTYLEDONOUS' or Exogenous Plants. 



Cellular and vascular. Stem formed of two distinct portions, 

 Wood and Bark, increasing in two opposite directions ; the 

 former containing pith in the centre, from which diverge the 

 medullary rays, and increasing by new layei's on the outside ; 

 the latter by new layers within. Leaves with the nerves much 

 branched and reticulated. Flowers usually with a double peri- 

 anth, the parts often arranged in a quinary manner. Embryo 

 with two opposite cotyledons, rarely more, and then verticillate. 



Sub-class I. THALAniiFLORiE. 



Calyx of many pieces or sepals, (^sometimes combi?ied). Petals 

 many, distinct, and as well as the stamens, inserted upon the re- 

 ceptacle, (?iot npo7i the calyx^; hence hypogynous, from v-o, be- 

 neath, and yvr/i, the pistil. 



Ord I. RANUNCULACE^. Ca^/.t- of mostly 5, rarely 3 

 or 6, sepals, frequently deformed. Petals 5 or more, often de- 

 formed, sometimes wanting. Anthers adnate, mostly reversed. 

 Ovaries 1 or many, 1- or many-celled. Fruit mostly of several 

 1- or many-seeded carpels, rarely a berry. Embryo straight, 

 in the base of a horny albumen. — Herbs or Shrubs. Leaves 

 often divided, with more or less dilated stalks. Acrid and poison- 

 ous, some of them eminently so, especially Aconitum. — Genera. 

 1. Clematis,/?. 211. 2. Thalictrum, j». 219. 3. Anemone,/?. 



' From ill, twice or double, and xoTuXtiluv, the cotyledon. 



