422 
Journal of Agricultural Research 
Vol. I, No. 5 
Shrubs or small trees; native to tropical Africa. 
The type species is Limonia Preussii Engler, from Kamerun. 
Citropsis is related to Citrus on the one hand and to Atalantia on the 
other. It differs from both in its compound leaves and broad-based 
pulp vesicles partly embedded in the endocarp and from Atalantia in 
Fig. 2.—Citropsis Schweinfurihii : Young seedlings germinated in 
Washington, I). C., from seed from Budongo Forest, Uganda, 
Africa (C. P. B. No. 2902). A, Young seedling, showing the first 
pair of leaves, succeeded by alternate simple leaves, and finally 
& unifoliate leaves (one-half natural size); B and D, young seed¬ 
lings, showing the first foliage leaves, which are opposite (natural 
size); C, a single one of the pair of first foliage leaves (natural size). 
Drawn by Theo. Holm. 
having only a single ovule in each of the four 
or five cells of the ovary. In spite of the fact 
_j that Poncirus 1 has trifoliate leaves it seems to 
be less closely related to Citropsis than is Citrus. 
Poncirus differs from both Citrus and Citropsis in its deciduous leaves, 
sessile solitary flowers, clawed petals, spreading stamens, stalked* pulp 
vesicles with external, branched, secreting hairs, and in having in ger¬ 
mination the first postcotyledonary leaves in the form of alternate 
cataphylls. 
1 Poncirus Raf. includes Citrus trifoliata L,., the type species, and as yet the only one known. See Swingle, 
Walter T. Poncirus (and Citrus). In Sargent, C. S. Plantse Wilsonianae. pt. 5. Cambridge, 1914. 
