THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY 



[SECOND SERIES.] 

 No. 81. SEPTEMBER 1854. 



XVII. — On the Occurrence of'Cinchonaceous Glands" mGaliacese, 

 and on the Relations of that Order to Cinchonacese. By 

 George Lawson, F.R.P.S., F.B.S.E., Demonstrator of 

 Botany and Vegetable Histology to the University of Edin- 

 burgh*. 



[With a Plate.] 



A few years ago, Dr. Weddell of Paris, in his magnificent mono- 

 graph of the Cinchonasf, drew attention to a singular feature 

 in these plants, viz. the constant presence of peculiar glands on 

 their interpetiolar stipules ; and the attention of this Society was 

 called by Professor Balfour to Dr. WeddelFs observations. 



The inner faces of the stipules are in many cases firmly glued 

 to the terminal bud, which they embrace, by a gummy or gum- 

 resinous matter exuded by the small sessile glands to which 

 reference has bee*, made. This secretion is stated by Dr. Wed- 

 dell to be fluid and transparent in Cinchonas and Cascarillas, 

 but solid and opake in several other genera, remarkably so in 

 Pimentelia glomerata. In the genus Rondeletia it is soft like 

 wax, and of a beautiful green colour. The inhabitants of Peru, 

 who give it the name of Aceite-Maria (oil of Mary), carefully 

 collect it, and employ it as an external application in various 

 maladies. It is well known to horticulturists that Cinchonaceous 

 plants under cultivation are very liable to the attacks of Acaridce 

 and other parasites ; and Mr. M'Nab has drawn my attention to 

 the fact, that it is invariably in the neighbourhood of the stipules 

 on the young shoots that these pests are most abundant, viz. at 

 the points of the plant where the secretion is most copiously 

 given off. 



* Read to the Botanical Society of Edinburgh, July 13, 1854. 



t Histoire Naturelle des Quinquinas, ou Monographie du genre Cinchona, 

 suivie d'une Description du genre Cascarilla et de quelques autres plantes 

 de la meme tribu, par M. H.-A. Weddell, M.D. Paris, 1849. 



Ann. fy Mag. N. Hist. Ser. 2. Vol. xiv. 11 



