26 RUTACE^E. 



Citrus Aurantium HAYATA Gen. Incl. p. 11, (non LINN.) 



HAB. Shintiku, Taihoku, cult. 



NOM. JAP. Sekkan ijj$$. Kirikunenbo, Tomikan. 



NOTE : Colour of the skin is like that of No. 131 and that of the pulp, 

 No. 151 in KLIN, et VAL. Cod. de Coul. Branches are somewhat like those 

 of (7. Daidai, but less ascending than those of G. nobilis var. poonensis. 

 Flowers in the middle of May. 



Valencia late, Bahia, Washington Navel and THOMPSON'S Improved Navel 

 are all forms of Citrus sinensis OSBECK. 



Citrus Tankan HAYATA sp. nov. (Fig. 17 et 18-6) Frutex 2| m. altus 3| m. 

 latus, rami validi sed divaricati inclinati ascnedentes. Folia oblongo-lanceolata 

 coriaeea 9-10 cm. longa 3^ cm. lata apice triangulari-acuminata ad summmn 

 obtusissima et mucronata basi acuto-cuneata margine versus apicem crenata, petio- 

 lis 1 cm. longis angustissime alatis vel haud alatis. Kami ad axillas foliorum 

 spinescentes, spinis 5 mm. longis. Fructus subgiobosus 6 cm. longus totiusque 

 latus ; pericarpio plus minus stricto fere losvi vel rugoso ; carnibus dulcibus ; 

 medulla partim solida partim cava. 



Note : Colour of the skin is like that of No. 156 and that of the pulp 

 No. 151 in KLIN, et VAL. Code des Coul. 



The flowers are larger, the petals are broader and the leaves are less obtuse 

 in this species, than in C. nobilis var. poonensis. The leaves of Tankan 

 are more or less minutely and elevately dotted above in the living specimens. 

 There is a distinct articulation between the ovary and style. Calyx-lobes of 

 Tankan are acute at the apex. Flowers of this species are a little larger than 

 those of C. nobilis var. poonensis, but of nearly the same characters of the latter. 

 The fruits with a nearly tight skin and a solid core somewhat resemble those of 

 C. sinensis. The branches too indicate the characters of those of the latter. 



There are three forms. They are : 



C. Tankan proper. Fruits broadly globose 6 cm. in length, 7 cm. in 

 width. The tree, when quite old, attains a height of nearly 4 m., the branches 

 spreading over 5 m. in width. 



HAB. Shintiku, Shirin, "Washoshu. 



NOM. JAT. Tankan 



