CITRUS FRUITS IN THE PHILIPPINES. 11 



which it is believed may be referred to this species, there are 

 no well-defined varieties of the mandarin. 



Citrus nobilis var. papillaris Blanco. TIZON. 

 (Plate II, 6) 



A spreading, small tree, attaining a height of 6 meters or more, in 

 habit similar to the pomelo; spines small, or wanting; leaves 10 to 14 

 centimeters long, 5 to 6 centimeters broad, ovate to elliptical oblong, 

 crenate, dark-green and shining above, crinkly, base broadly acute, apex 

 narrowly acute to almost acuminate and caudate; petioles 17 to 20 milli- 

 meters long with narrow wing margin; flowers not seen; fruit large from 

 6 to 10 centimeters in diameter, 170 to 580 grams in weight, somewhat 

 compressed at basal half, usually ending in a more or less conspicuous 

 nipple which, however, is sometimes wanting; apex flattened, or even 

 depressed; surface smooth, pale greenish turning to orange yellow; skin 

 medium thin; locules 10 to 11, separable from each other and the skin like 

 the mandarin; pulp yellowish, subacid, very juicy, and of good flavor with 

 marked "quinine" taste; juice cells large; seeds very few, rarely more 

 than 7. 



The tizon is extremely rare and only a few trees are found 

 in cultivation, confined to the citrus district of Batangas, Luzon. 

 The trees are said to be quite prolific, and the fruit matures 

 from September to December. This fruit, on account of its 

 scarcity, is of no commercial importance. However, it would 

 be an acceptable dessert or breakfast fruit, being a little more 

 acid than the orange. It is said to be an introduction from 

 Spain. The tizon is without doubt the C. papillaris described 

 by Blanco in "Flora Filipinas." 



The tizon is believed to be a natural hybrid between the 

 mandarin and the pomelo. It has inherited the loose-skinned 

 character, large juice cells, and partial absence of spines, and 

 leaf character of the first-named species to which it is (without 

 the writer having had the opportunity to examine the flowers) 

 unquestionably more closely related than to any other species 

 in the genus. The tizon is represented in the citrus collection 

 at the Lamao experiment station under Bureau of Agriculture 

 No. 744 and 745. 



Citrus decumana L. POMELO. 



A tree 6 to 12 meters in height, with a rounded or conical head, and 

 a trunk upward? of 45 centimeters in diameter; bark smooth, grayish 

 brown; young leaves and shoots sparsely pubescent, light green; leaves 

 ovate, blunt, pointed or rounded, emarginate, smooth, dark, glossy green, 

 leathery, margin crenate; petioles articulated, broadly winged; flowers 

 produced singly or in cymose clusters of 2 to 20, sweet scented; calyx 

 cupped, large; sepals 4 to 5, pointed; corolla white, 37 to 43 millimeters 

 across; petals 4 to 5, slightly reflexed, fleshy, oblong; stamens 20 to 25; 



