104 NOMENCLATURE OF THE APPENDAGES. 



a. Caducous falling off before the leaves are expanded, as in the 

 common cherry-tree, oak, poplar, and many others. 



b. Deciduous falling off with the flower, as in many plants. 



c Persistent remaining until the fall of the leaf, as in the rose, 

 raspberry, tormentil, and so OH. 



10. Structure: The terms decurrent, sheathing;, 

 subulate, and many others applied to stipules, have been 

 previously explained under the nomenclature or termi- 

 nalogy of the leaf. 



FLORAL LEAF OR BRACTEA. 



17. The technical terms applied to the floral-leaf, 

 are very few : these have their origin from the colour of 

 the bractea, as being coloured or green ; or from its dura- 

 tion, as being caducous, deciduous, or persistent. 



The terms just mentioned, have been repeatedly explained : we 

 shall here only observe, that the following, among other plants, fur- 

 nish us with the most remarkable instances of the floral-leaf, viz. 

 the lime-tree, cow-wheat, some species of fumitory, milk-wort, 

 rest-harrow, passion-flower, and hellebore. 



THORN, SPINE OR SPINA. 



18. Thorns, according to attending peculiarities, are 

 either called cauline, terminal, foliar, marginal, axillary, 

 calycine, pericarpial, stipular, simple, double, &c. 



a Cauline protruded from the stem and branches, as in the 

 buckthorn. 



b. Terminal-placed at the end of a branch or leaf, as in the 

 buckthorn. 



c. Foliar protruded from the surface of the leaf, as in the 

 milk-thistle. 



d. Marginal protruded from the margin of the leaf, as in the holly. 



e. Axillary proceeding from the angle which is formed by a 

 branch or leaf with the stem, as in the tliree-thorncdhoney-Iocnst-trer . 



