Vo1 - 2 RUTACEAE 341 



Aegle glutinosa Merr. in Govt. Lab. Publ. (Philip.) 6 (1904) 12, 27 



(1905) 29, Fl. Manila (1912) 271. 

 Lvmonia engleriana Perk. Frag. Fl. Philip. (1905) 163. 

 Belou glutinosa Skeels in U. S. Dept. Agr. Bur. PL Ind. Bull. 162 

 (1909) 26. 

 Luzon (Isabela to Tayabas). In thickets and secondary forests at low 

 and medium altitudes. An endemic monotypic genus. 



Local names: Boyag (Tag.); kabuyau-aso (Tag.); kabuyok (Ilk.); ka- 

 lantan (Ibn.) ; tabog (Tag.) ; tab6k (Tag.) ; talubok (Tag.) ; uratan (Ilk.) ; 

 malakabuyau (Tag.). 



20. CITRUS * Linnaeus 

 CITRUS AURANTI FOLIA (Christm.) Swingle in Journ. Wash. Acad. 

 Sci. 3 (1913) 465; Merr. Interpret. Herb. Amb. (1917) 296, Sp. 

 Blancoanae (1918) 203. 

 Limonia aurantifolia Christm, Pflanzensyst. 1 (1777) 618. 

 Lvmonia acidissima Houtt. Nat. Hist. II 2 (1774) 444, non Linn. 

 Limonia spinosum Mill. Gard. Diet. ed. 8 (1768), non Citrus spinosa 



Gmel. 

 Citrus lima Lunan Hort. Jamaic. (1814) 451; Merr. Fl. Manila (1912) 



271. 

 Citrus javanica Blume Bijdr. (1825) 140; Usteri Beitr. Ken. Philip. 



Veg. (1905) 113. 

 Citrus acida Roxb. Fl. Ind. ed. 2, 3 (1832) 390, non ? Pers. 

 Citrus notissima Blanco Fl. Filip. (1837) 607, ed. 2 (1845) 424, ed. 



3, 2 (1879) 406. 

 Citrus limetta Risso var. aromatica Wester in Philip. Agr. Review 



8 (1915) 25. 

 Citrus excelsa Wester in Philip. Agr. Review 8 (1915) 26, inch var. 

 davaoensis Wester 1. c. 

 Throughout the Philippines in the settled areas, usually planted. Pan- 

 tropic, but native of the Indo-Malayan region, although apparently not a 

 native of the Philippines. The lime. 



Local names: Bilolo (Tag.); dalaya' (Ibn.); dalayap (Ilk.); dayap 

 (Tag.) ; dulugot (Neg.) ; gorong-gorong (Ilk.) ; gugulo (If.) ; limon (Sp.) ; 

 muyong (Bon.); sua (Bik.). 



* Following horticultural rather than strictly botanical usage the orange, 

 the mandarin orange, the lime, the lemon, the citron, and the pomelo are 

 here enumerated as species. It is highly probable that some of these fruits 

 are of hybrid origin. In essential characters they are certainly no more 

 distinct from each other than are some of the species recently proposed 

 by Wester. I can see no really valid reasons for considering the sweet and 

 sour oranges and the mandarin orange as other than forms of a single 

 species. Without exception Wester's species were based on cultivated 

 plants and are, I believe, simple or complex hybrids or at most varieties of 

 older species. It is a well-known fact that the various Citrus species 

 freely hybridize. The only strictly native species in the Philippines is 

 apparently Citrus hystrix DC. 



Citrus gaoganensis Hayata, C. Umonelloides Hayata, C. depressa Hayata, 

 C. tankan Hayata, C. natsudaidai Hayata, and C. kotokan Hayata, all 

 recently described from Formosan material, Ic. PI. Formos. 8 (1919) 

 14-31, are, I believe, not true species but merely hybrids. 



