] 62 Mr. G. Lawson on Cinchonaceous Glands in Galiacese. 



The glands occur at the extreme base of the stipule on its 

 inner or upper surface^ and are most plentiful in the immediate 

 vicinage of the nervures of the stipule, where spiral vessels are 

 abundant ; but these do not enter the tissue of the gland. In 

 those plants whose stipules early become reflexed [Rogera for 

 example) the glands are conspicuously exposed to view ; but in 

 those whose stipules remain closely glued to the stem, it requires 

 careful dissection to show them. It is in the young state of the 

 stipule, when it envelopes the terminal bud, that the glands are 

 in best condition for examination ; they get quite dried up before 

 the stipule decays. 



These stipular glands appear to be of universal occurrence 

 throughout the whole order Cinchanaceis, but as this has not 

 been ascertained from actual observation of all the species, it 

 seems desirable here to record the names of those in which they 

 have been particularly noticed, in order that botanists who have 

 the opportunity may, from time to time, extend the list of ob- 

 servations. These glands have been examined in the following 

 species, viz. — 



Cinchona Calisaya, Wedd. Rondeletia odorata, Jacq, 



' Coiidaminea, Humb. et Bonpl. Burchellia capensis. Brown. 



lancifolia, Mutis. Cephaelis Ipecacuanha, A. Rich. 



amygdalifolia, Wedd. Coffea arahica, Linn. 



scrobiculata, Humb. et Bonpl. Ixora javanica, DC. 



australis, Wedd. coccinea, Linn. 



boliviana, Wedd. Mussaenda frondosa, Linn. 



ovata, Ruiz et Pav. Pavetta indica, Linn. 



rufinervis, Wedd. Luculia gratissima. Sweet. 



> Chomeliana, Wedd. Pinciana, Hook. 



micrantha, Ruiz et Pav. Pentas camea, Benth. 



pubescens, Vahl. Gardenia Stanleyana, Hook. 



cordifolia, Mutis. Pimentelia glomerata, Wedd. 



purpurascens, Wedd. Exostemma longiflorum, R. Sf S. 



— — ^ carabayensis, Wedd. Rogera Rcegelia. 



asperifolia, Wedd. versicolor. 



Cascarilla Carua, Wedd. -— 

 Ladenbergia dichotoma. Kitsch. 



In all 35 species. 



The Cinchonaceous glands are, in general, minute, more or 

 less conical bodies, rising from the surface of the stipule, and 

 are mostly colourless, but in some instances highly coloured, and 

 are then conspicuous objects. 



Their plan of structure is perhaps more distinctly seen in 

 Cinchona Calisaya than in any other species, and is well illus- 

 trated in Dr. WeddelFs book. In that plant the gland is sessile, 

 of an oval or lanceolate form, and somewhat pointed at the apex. 

 It consists of a mass of dense tissue of somewhat elongated cells, 

 forming a central nucleus of a conical shape. This axial nucleus 



