RUTACEAE 



295 



Glycosmis spinosa Dietr. Syn. PI. 2 (1840) 1409. 

 Merope spinosa M. Roem. Syn. Mon. Hesp. 1 (1846) 44. 

 Limonia angulosa W. & A. ex Miq. Fl. Ind. Bat. 1 2 (1859) 521 

 (type!). 



Atalantia longispina Kurz in Journ. As. Soc. Beng. 41 2 (1872) 295. 

 Gonocitrus angulatus Kurz 1. c. 42 2 (1874) 228, t. 18. 

 Paramignya longispina Hook. f. Fl. Brit. Ind. 1 (1875) 511. 

 Paramignya angulata Kurz in Journ. As. Soc. Beng. 43 3 (1874) 135. 

 Atalantia spinosa Hook. f. ex Koord. Exkurs. Fl. Java 2 (1912) 427. 

 Limonellus angulosus Rumph. Herb. Amb. 2: 110, t. 32. 



The above formidable list of synonyms is copied from Swingle's 

 paper on Merope* He has there given a critical consideration 

 of Merope angulata (Willd.) Swingle and its numerous syn- 

 onyms. Rumphius's figure and description are the whole basis 

 of Citrus angulata Willd. and hence typify the species, which 

 on Wight and Arnott's suggestion was transferred to Limonia as 

 L. angulosus W. & A. by Miquel ; it is, therefore, also the type of 

 Limonia angulosa W. & A. It is also the name-bringing syn- 

 onym of both Gonocitrus angulatus Kurz and Paramignya angu- 

 lata Kurz. Kurz was the first to recognize the identity of 

 Limonellus angulosus Rumph. and its true relationships. 



CITRUS Linnaeus 



A number of representatives of the genus Citrus are figured 

 and described by Rumphius, and these have been variously inter- 

 preted by botanists. Some maintain that the species of this 

 genus are reducible to a few polymorphous types with nu- 

 merous varieties, while others maintain that the genus is 

 composed of a large number of closely allied species. The 

 probabilities are that there are relatively few species and that 

 these have yielded numerous horticultural forms and hybrids ; 

 it is not at all improbable that natural hybrids occur. In such 

 a genus as Citrus it is naturally to be expected that authors 

 have widely differed in interpreting the forms described by 

 Rumphius. In relatively few cases is it possible definitely to 

 determine from his figures and descriptions alone the exact 

 status of the several forms in our present system of classifica- 

 tion. The Robinson Amboina collection presents but two species 

 of Citrus, the common lime and the common pomelo, and na- 

 turally helps but little in determining the status of the Rumphian 

 species or forms. Until extensive field work is prosecuted in 

 the whole Malayan region and until the entire genus Citrus 

 undergoes a very thorough and critical revision, any attempt 



* Merope angulata, a salt-tolerant plant related to Citrus, from the 

 Malay Archipelago. Journ. Wash. Acad. Sci. 5 (1915) 420-425. 



