THE PHILIPPINE 
Journal of Science 
C. Botany 
VOL. XIII NOVEMBER, 1918 No. 6 
MERRILLIA, A NEW RUTACEOUS GENUS OF THE TRIBE 
CITREAE FROM THE MALAY PENINSULA 
By Walter T. Swingle 
TWO PLATES 
In the tropical regions of the Eastern hemisphere there occurs 
a small but very well-marked group of citrous plants having 
large fruits with a woody or leathery pericarp, and five or 
more locules with numerous seeds embedded in a transparent 
glutinous jelly. These so-called hard-shelled citrous fruits com- 
prise at present six genera and nine species, and range from the 
Philippines west to Liberia in western Africa, and from India 
and Indo-China to Java and other Malayan Islands. Aegle 1 
with one species occurs in India and Indo-China, Balsamocitrus 2 * 4 
with three species in tropical Africa, Aeglopsis with one species 
in West Africa, Feronia with one species in India and Indo-China, 
Feroniella 3 with two species in Indo-China and Java, and Cha- 
etospermum 4 with one species in the Philippine Islands. These 
six genera constitute a natural group inside the tribe Citreae. 
This group I propose to recognize as a subtribe Balsamocitrinae, 
1 These genera and species I have described in popular form in L. H. 
Bailey’s Standard Cyclopedia of Horticulture. New York (1914-1917). 
2 Swingle, Walter T., Le genre Balsamocitrus et un nouveau genre 
voisin, Aeglopsis, Bull. Soc. Bot. France 58 (mem. 8d) (1911) 225-245, t. 
1-5. Reprinted in Chevalier, Aug., Novitates florae africanae, fasc. 4: 
225-245, t. 1-5. 
8 Swingle, Walter T., Feroniella, genre nouveau de la tribu des Citreae, 
fondee sur le F. oblata, espece nouvelle de l’Indo-Chine, Suit. Soc. Bot. 
France 59 (1912) 774-783, t. 18. 
4 Swingle, Walter T., Chaetospermum, a new genus of hard-shelled 
citrous fruits, Joum. Washington Acad. Sci. 3 (1913) 99—102. 
158742 
335 
