swingle: chaetospermum 99 



BOTANY. — Chaetospermuvi, a new genus of hard-shelled citrous 

 fruits. Walter T. Swingle, Bureau of Plant Industry. 



The wild relatives of the common orange may be divided into 

 several rather distinct groups. One of these consists of the hard- 

 shelled citrous fruits of which the best known representatives 

 are the bael fruit, Belou marmelos (L.) W. F. Wight {Aegle mar- 

 melos (L.) Correa), and the wood apple of India {Feronia ele- 

 phantum, Correa). These two were known to Rheede, Rumphius, 

 Hermann and other pre-Linnean botanists as well as to Linnaeus 

 himself. 



A number of other plants belonging to this group are known 

 to botanists. Four of them are natives of Africa and have come 

 to light only recently. In the East Indies two species have 

 long been known, but are little understood as yet. One of these, 

 Feronia lucida Scheffer, grows in Java and is closely related to 

 the wood apple of India. The other, the subject of the present 

 note, was described in 1837 by Blanco, in the first edition of his 

 Flora de Filipinas, under the name Limonia glutinosa. He saw 

 it growing on Mt. Arayat, Province of Manila, Luzon Island, 

 and noted that it was called malacabuyao or tabog by the Tagals. 



In the second edition of his Flora de Filipinas, published in 

 1845, Blanco recognized that this plant was related to the wood 

 apple and renamed it Feronia ternata. 



About 1878, Andres Naves, in editing a new illustrated edition 

 de luxe of Blanco's Flora de Filipinas, recognized that the tabog 

 was more nearly allied to the bael fruit than to the wood apple 

 and accordingly transferred it to the genus Aegle making a new 

 specific name A. decandra. In 1904 Merrill restored Blanco's 

 original specific name, Aegle glutinosa (Bl.) Merrill. 



An examination of the typical material in the Botanical Mu- 

 seum at Dahlem bei Berlin, made by the writer in June, 1911, 

 showed Limonia Engleriana, Perkins, to be the tabog, as had 

 been noted by E. D. Merrill on one of the paratypes. 



In establishing a new genus, Aeglopsis,^ from tropical West 



1 Swingle, Walter T., 1912, Le genre Balsamociirus et un nouveau genre voisin, 

 Mglovsis, in Bull. Soc. hot. de France (1911), 58 (mem. 8d) : 225-245, figs. A, B, 

 pis. 1-5 (March 2) also in Chevalier, Aug., Novitates florae africanae, fasc. 4, p. 

 225-245. 



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