20 PHILIPPINE AGRICULTURAL REVIEW. 



centimeters broad, ovate to short ovate, bicrenate, dark green and glossy; 

 base rounded, apex emarginate; petiole 4 to 7.5 centimeters long, 2.9 to 5 

 centimeters wide, oblong, with a broadly acute to obtuse base; wing area 

 nearly equal to or frequently exceeding the leaf area; flowers 20 milli- 

 meters across, in axillary clusters of 2 to 6; pedicel slender; calyx small, 

 not cupped; petals 4 to 5, white, with a tinge of purple on the outside; 

 stamens 21 to 26, free, equal; ovary subglobose, 3 millimeters long, 11 to 

 14 loculed; style short, 1 millimeter long, distinct; fruit 48 to 55 milli- 

 meters long, and about 50 millimeters in transverse diameter, irregularly 

 globose to oblate, usually compressed towards base, ending in a small 

 nipple, more or less wrinkled, greenish lemon yellow; pulp greenish, fairly 

 juicy, acid, scarcely edible; juice cells small, short, containing a small 

 greenish nucleus; seeds small, oblong, reticulate. 



This plant is the C. torosa of Blanco, which has been consid- 

 ered a synonym of C. histrix, and here raised to the rank of 

 a subspecies. A comparative study of C. histrix and the variety 

 torosa shows considerable differences between the two. C. his- 

 trix is generally larger in all parts; the wings of C. h. torosa 

 are oblong, maintaining an almost equal width over a large part 

 of the petiole, ending in a rounded to a broadly acute base, while 

 in C. histrix, and in fact in all the species herein described with 

 free stamens, the wings are more or less cuneate to elongate 

 cuneate or oblong-spatulate, ending usually in an acuminate, 

 sometimes an acute base, the one closest approaching the C. h. 

 torosa in this respect being the "balincolong," referred to C. 

 micrantha. The flower of C. h. torosa corresponds with that 

 of C. histrix except that the former has 21 to 26 stamens as 

 compared with 30 to 36 in C. histrix, which also averages more 

 locules to a fruit. 



B. A. No. 3665, 3666 (Batangas). 



Citrus micrantha. BIASONG. 

 (Pis. Vc, VI6, VIIc.) 



A tree attaining a height of 7.5 to 9 meters, with comparatively small 

 but sharp spines; leaves 9 to 12 centimeters long, 27 to 40 millimeters 

 broad, broadly elliptical to ovate, crenate, rather thin; base rounded or 

 broadly acute; apex acutely blunt pointed; petioles 35 to 60 millimeters long, 

 broadly winged, up to 40 millimeters wide; wing area sometimes exceeding 

 leaf area; flowers small, 12 to 13 millimeters in diameter, white, with a 

 trace of purple on the outside, 2 to 5, in axillary or terminal cymes; 

 petals 4; stamens free, equal, 15 to 17; ovary obovoid, locules 6 to 8; style 

 slender, distinct; fruit 5 to 7 centimeters long, 3 to 4 centimeters in trans- 

 verse diameter, averaging 26 grams in weight, obovate to oblong-obovate, 

 somewhat compressed towards base; apex blunt pointed; surface fairly 

 smooth or with transverse corrugations, lemon yellow; skin comparatively 

 thick; pulp rather juicy, grayish, acid; aroma similar to that of the samu- 

 yao; juice cells short and blunt to long, slender and pointed, sometimes 



