22 PHILIPPINE AGRICULTURAL REVIEW. 



or less everbearing. The fruit is used by the Filipinos as a 

 hair wash, and is of no economic importance. 



Throughout, the samuyao gives an impression of dwarfness, 

 by its small size, weak spines, small, and thin leaves ; the flowers 

 are even smaller than in the biasong and the fruit is in all 

 probability the smallest in the genus. 



In Bohol a somewhat more vigorous variety of samuyao was 

 found which is named "samuyao-sa-amoo." The fruits of samu- 

 yao-sa-amoo are a little larger, and smoother, and longer than 

 broad, otherwise similar to the samuyao. 



Samuyao, B. A. No. 2371, 2509 (Cebu), 2530, 4821 (Bohol) ; 

 Samuyao-sa-amoo 2533, 4832 (Bohol). 



Citrus medico. L. CITRON. 



A shrub or small tree, about 3 meters high, with a short, indistinct 

 trunk and short, thick, irregular, straggling, thorny branches; bark light 

 pray; thorns short, sharp, rather stout; young shoots smooth, violet colored 

 or purplish, stiff; leaves large, 10 to 15 centimeters long, oval oblong, 

 serrate or somewhat crenate, dark green above, lighter beneath; flowers 

 small, axillary, in compact clusters of 3 to 10, often uninsexual ; calyx 

 small, cupped; corolla white within, tinged with purple on the outside; 

 petals oblong, the tips incurved; stamens short, irregular in length, 40 to 

 45 in number; pistil small; 1 ovary 9 to 12 loculed or occasionally more; 

 fruit lemon yellow, large, 15 to 22 centimeters long, oblong, rough or 

 warty, sometimes ridged; apex blunt pointed; rind thick, white, except 

 for the outer colored rim; pulp sparse; juice scant, acid, and somewhat 

 bitter or sweetish; juice sacs small, slender; seeds oval, plump, light 

 colored, smooth. Probably native to India, or it may have been intro- 

 duced there from farther east, China or Cochin China. Extremely sensi- 

 tive to cold. 



The citron is the rarest of all the old cultivated citrus in the 

 Philippines and is very seldom seen in the markets. 



Citrus medica var. odorata. TIHI-TIHI. 

 (PI. Vila.) 



A small, thorny shrub, seldom exceeding 2.5 meters in height, with 

 sharp, stout spines; young growth bright green; leaves 7.5 to 11 centi- 

 meters long, 4.3 to 6.5 centimeters broad, elliptical, rather thick and 

 leathery, serrate, of distinct fragrance; base rounded; apex notched; peti- 

 oles very short 4 to 6 millimeters long, not winged; flowers 1 to 4 in 

 axillary compressed cymes, sessile, rarely exceeding 38 millimeters in 

 diameter; calyx large, prominently cupped; petals 4 to 5, fleshy, white, 

 with a tinge of purple on the outside; stamens 36 to 42, unequal, shorter 

 than stigma; filaments united in groups of 4 to 6; pollen abundant; gynoe- 



1 In the above description the pistil is said to he small. Citron flowers 

 examined by the writer have been found to have large pistils similar to 

 those in C. m. var. odorata and C. m. var. nanns. 



