18 



RUTACEJE. 



3 cm. longa 14 mm. lata apice obsusa basi baud vel leviter contracta valde 

 reflexa. Stamina circ. 40, antheris linearibus 6 mm. longis 1| mm. latis apice 

 apiculatis basi 2-lobatis. Discus annuliforrnis. Ovarium obovoideo-cylindricum 

 7 mm. longum 6 mm. latum sursum hirsutum, stylo columnar! 12 mm. longo 



3 mm. crasso, stigmate pulviniformi 3 

 mm. alto 7-8 mm. in diametro sub- 

 peltato. Fructus pyriformis 12 cm. 

 longus 11 cm. latus circ. 10-locularis, 

 pericarpio crasso flavesceiiti ; carnibus 

 fere albicantibus. 



HAB. Shintiku, Shirin, leg. B. HA- 

 YATA. 



Citrus grandis OSBECK form. Buntan. x J. 

 This specimen is taken from a young tree ; 

 a specimen from an older one has a much 

 thinner peel. 



NOM. JAP. Buntan, 



NOTE : Flowers towards the end of 

 March. 



The present species is principally 

 distinguishable from the following 



one, Zalon, in the shape of the fruits, as can be seen in the accompanying 

 figures. Leaves of the former are more densely arranged and their surfaces 

 are less undulate ; but those of the latter are less densely arranged and their 

 surfaces are much more undulate. Wings of the petioles in Zdbon are smaller 

 than those of Buntan. But these differences just given can never be regarded 

 as constant ; there are very many exceptions. 



Citrus Sabon SIEB. Synopsis Plantarum Oeconomicarum Universi Eegni 

 Japonici, in Verh. Batav. Gen. XII. (1830) p. 59, (nornen nudum). Frutex 

 yel arborescens 7 m. altus latior quam longior, rami validissimi divaricati vel 

 plus minus inclinati. Fructus depresso-globosus 18 cm. longus totiusque latus 

 apice plus minus conicus basi depressus, pericarpio flavescenti, carnibus purpura- 

 scentibus, 10-15-locularis. 



Citrus decumana LOUR. ; HAY ATA Gen. Ind. p. 11. 



HAB. Shinldku, Sliirin, ubique cult. 



NOM. JAP. Zabon, jj$ ; Yu, jfa. 



There are several forms of this Citrus. They are as follows. 



