CITRUS FRUITS IN THE PHILIPPINES. 17 



dark green and shining above, leathery; base acute; apex acute to obtuse, 

 frequently emarginate; petioles 35 to 70 millimeters long, the wings 25 to 

 30 millimeters broad in large leaves, the average wing area somewhat less 

 than half of the leaf blade; flowers 2 to 6, in compact axillary or terminal 

 cymes, sometimes solitary, 14 to 20 millimeters in diameter, white, with 

 trace of purple on the outside; calyx very small; stamens 22 to 28, free; 

 ovary globose to oblate; locules 15 to 19; stigma almost sessile; fruit 45 

 to 55 millimeters long, 55 to 65 millimeters in equatorial diameter, oblate, 

 with shallow cavity at apex, smooth, with slight longitudinal corruga- 

 tions; lenticels sparse, small; oil cells usually raised; skin thin; pulp 

 fairly juicy, sharply acid, bitter, with distinct .aroma from C. histrix; 

 juice cells short, plump, granulate, small, containing a small, greenish 

 nucleus; seeds numerous. 



The limao, though rare, is not uncommon in Bohol, where it 

 is cultivated and has also been collected by the writer in Bagan- 

 ga, Mindanao. The flowers appear late in April and during 

 the early part of May, with the fruit ripening in January and 

 February ; a few fruits nearly full grown were collected in May. 

 No. 2049 has flowered irregularly from May to December. The 

 fruit is not eaten, but used in washing by the Boholanos and 

 is of no economic importance. The tree is evidently quite 

 drought resistant, and succeeds well in very scanty soil underlaid 

 with limestone. 



The limao belongs in that group of the citrus fruits having 

 free filaments, the most conspicuous characters being the com- 

 pact growth of the crown, the dark-green, thick, and distinct 

 leaves, the almost sessile stigma, and the attractive, oblate, regu- 

 lar-shaped fruit with its many locules, exceeding in number 

 those in all other citrus fruits known to the writer. This spe- 

 cies has been named in honor of Mr. E. F. South wick, elsewhere 

 referred to in the paper. 



B. A. No. 2049 (Baganga, Mindanao), 2504, 4823 (Bohol). 



Citrus histrix DC. CABUYAO. 

 (PL Vb; fig. 1.) 



A thorny tree, sometimes exceeding 6.5 meters in height; spines medium 

 large and sharp; leaves 13.5 to 18 centimeters long, 4 to 6 centimeters 

 broad, ovate to oblong ovate, coriaceous, dark green and shining above, 

 crenate; base rounded to broadly acute; apex acute, sometimes emarginate; 

 petiole 5.5 to 8 centimeters long, broadly margined, sometimes 4.5 centi- 

 meters wide, wing area inferior or equal to sometimes exceeding leaf area; 

 flowers 4 to 7, in axillary or terminal, compact cymes, 17 to 28 millimeters 

 in diameter; calyx small, not cupped; petals 4 to 5, oblong ovate, white, 

 with trace of purple on the outside; stamens 30 to 36, equal, free, with 

 abundant pollen; ovary rather large, globose, 13 to 18 loculed; style short 

 and stout; stigma knob like; fruit subglobose to short pyriform or turbi- 

 nate, attaining a length of 9 centimeters and a diameter of 7 centimeters; 



131287 2 



