LECT. XI.] CAULINAR AND FOLIAR APPENDAGES. 635 



It is seated in a depression of the cutis, and com- 

 municates with the interior of the leaf by means 

 of a duct, which passing through the apex to the 

 base of the cone penetrates the cutis. The texture 

 of this gland is cellular ; and its secretion is an 

 essential oil. The leaves of the Sea-side Balsam, 

 Croton Eluteria, furnish examples, also, of the 

 scaly gland *. 



b. The pediculated gland is elevated from the 

 surfaces on which it is found, by an interposed 

 pedicle or stalk. It comprehends four species, the 

 cup-shaped, the knob-like, the stipitate, and the 

 branched glands. 



1. The cup-shaped gland, glandula cyathifor- 

 mis 9 as its name imports, resembles a shallow cup 

 or saucer, supported on a thick, short, footstalk 

 (Plate 9, fig. 30). It is found on the petioles of 

 some leaves, as, for instance, those of the Nec- 

 tarine, Amygdalus Persica, and the Passion- 

 flower ; and in the serratures of others, as those of 

 the Bay-leaved Willow, Salix pentandra, &c. The 

 secretion is generally of a resinous character, and 

 exudes from the hollow part of the gland, which is 

 devoid of epidermis. This species of gland, like 

 the majority of the external glands, is cellular, 

 and we can distinctly trace into it a cord of both 



* Sprengel has figured these in his Elements of the Phi- 

 losophy of Plants (P.-vi. fig. 8); but regards them merely a* 

 scales. 



