24 PHILIPPINE AGRICULTURAL REVIEW. 



Citn<* limonum Risso. LEMON. 



A small tree 3 to 6 meters in height, with rather open head of short, 

 round or angular branches, thorny; bark grayish; young shoots purplish, 

 smooth; leaves evergreen, alternate, 50 to 75 millimeters in length, ovate 

 oval, sharp pointed, light green, margin serrate; petioles entirely wing- 

 less; flowers solitary, occasionally in pairs, axillary, on distinct peduncles; 

 calyx persistent, segments 4 or 5; corolla large, 38 to 50 millimeters across, 

 white inside, purplish outside; petals oblong, spreading, strongly reflexed; 

 stamens 20 to 26, separate, or more or less united in small groups; ovary 

 considerably elevated on a prominent disk, 7 to 10 loculed; fruit ripening 

 at all seasons, ovoid or oblong, and pointed at both base and apex, about 

 75 millimeters long, smooth or rough, light yellow in color; rind thin, 

 flesh light colored; pulp acid; juice sacs long and pointed; seeds oval, 

 pointed at the micropylar end, quite smooth. Native of the same regions 

 as the citron. 



The true lemon is very rarely cultivated in the Philippines 

 and all lemons used are imported from California, Australia and 

 Spain. 



Citrus pseudolimonum. COLO-COLO. 



(PI. Vila.) 



A thorny shrub, 3 meters tall, with interlocking branches, and short, 

 sharp spines; leaves 8 to 11 centimeters long, 40 to 45 millimeters broad, 

 elliptical to oblong-ovate, crenulate to serrulate; base rounded; apex ob- 

 tuse, frequently slightly notched; petioles 18 to 25 millimeters long, with 

 narrow wing margin, rarely exceeding 10 millimeters in width; flowers 

 1 to 5, in terminal or axillary short cymes, 28 to 35 millimeters in diam- 

 eter, white, purplish outside; calyx cupped; stamens 30 to 37, nearly 

 always free, unequal; ovary broadly obovoid, 14 to 18 loculed; style dis- 

 tinct; fruit roundish to pyriform, small, usually compressed at base; apex 

 irregular; surface greenish lemon, more or less corrugate; oil cells raised; 

 skin comparatively thick; pulp acid; juice cells small, short and plump; 

 seeds undeveloped and sterile. 



The colo-colo is another of these peculiar Philippine species 

 with more or less winged petioles affiliated to the lemon, etc. 

 Flowers were collected in May, and ripe fruit has been examined 

 in January and February. The nearly always free stamens in 

 a plant belonging to the same general group as the lemon is of 

 interest. 



Near the colo-colo is the "lombog," considered a distinct fruit, 

 also found in Bohol. This variety is less vigorous than the colo- 

 colo and also differs from the plant in having narrower wing 

 margins and 21 to 28 stamens and 9 to 11 locules. The fruit is 

 said to be about 4.5 centimeters in diameter and similar in shape 

 to that of the colo-colo. 



The "kunot" is a third variety considered distinct by the 

 Boholanos that also may be referred to C. pseudolimonum. 



