NOMENCLATURE OF THE APPENDAGES. 107 



a. Foliar when they are situated on the surface of the leaf, as in 

 the spotted bark-cotton which has one gland on the leaf, and in the 

 Barbadoes cotton, the leaves of which have three. 



b. Petiolar when they are situated on the petiole or foot-stalk, 

 as in the passion-flower and palma christi or castor-oil plant. 



c. Corollar when they are situated on the corolla, as in the com- 

 mon berberry. 



d. Filamentous^when they are situated on the filaments, as in the 

 common fraxinella. 



27. Attachment: In attachment, glands are either 

 sessile or pedunculated. 



a. Sessile without any foot-stalk or peduncle, as in the culti- 

 vated cherry-tree. 



b. Pedunculated situated on a peduncle, as the glands are 

 in F. 154. 



28. Figure : Glands assume a great variety of ap- 

 pearances. 



Sometimes they resemble a blister or bladder, as in the St. John's 

 wort ; sometimes a number of scales, as in many ferns ; sometimes 

 small grains, not unlike those of millet, as in the fir-tree, and in some 

 instances a small cup, as in the apricot tree. 



PUBESCENCE. 



29. Under this head, we have to consider the pilus 

 or hair, and the seta: or bristle. 



HAIR OR PILUS. 



30. Hairs are fine, slender, cylindrical, flexible bodies 

 found on the surfaces of the herbaceous parts of plants. 

 They are either simple or compound. 



31. Simple: When they are of a single piece, the 



