BOTANY OF CITRUS FRUITS. 19 



small tree, about ten feet high with a short, indistinct trunk and 

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

 gray; thorns short, sharp, rather stout; young shoots smooth, 

 violet colored or purplish, stiff; leaves large, four to six inches 

 long, oval oblong, serrate or somewhat crenate, dark green above, 

 lighter beneath; flowers small, axillary in compact clusters of 

 three to ten, often unisexual; calyx small, cupped; corolla white 

 within, tinged with purple on the outside; petals oblong, the 

 tips incurved; stamens short, irregular in length, forty to forty- 

 five in number; pistil small, ovary nine to twelve loculed, or 

 occasionally more; fruit lemon yellow, large, 6 to 9 inches 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 sacks 

 small, slender, seeds oval, plump, light colored, smooth. Proba- 

 bly native of India, or it may have been introduced there from 

 farther east, China or Cochin China, Extremely sensitive to 

 cold. 



Citrus Lining 11 Risso, Ann. Mus. Paris, XX: 201, 1813. 

 Lemon. A small tree, ten to twenty feet in height, with rather 

 open head of short, round or angular branches, thorny; bark 

 grayish; young shoots purplish, smooth; leaves evergreen, alter- 

 nate, two to three inches in length, ovate-oval, sharp pointed, 

 light green, margin serrate; petioles entirely wingless; flowers 

 solitary occasionally in pairs, axillary, on distinct peduncles; 

 calyx persistent, segments four to five; corolla large, 1 1-2 to 2 

 inches across, white inside, purplish outside, petals oblong spread- 

 ing, strongly reflexed; stamens twenty to twenty-six, separate, 

 or more or less united in small groups; ovary considerably ele- 

 vated on a prominent disk, seven to ten loculed; fruit ripening at 

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

 about 3 inches long, smooth or rough, light yellow in color, rind 

 thin; flesh light colored, pulp acid, juice sacks long and pointed; 

 seeds oval, pointed at the micropylar end, quite smooth. Native 

 of the same regions as the citron. 



Citrus Limetta Risso, Ann. Mus. Paris, XX: 195, 1813. J^ujjfc 

 a shrub or small tree of straggling habit, with small, stiff, inter- 

 locking or drooping thorny branches, the thorns small, sharp, 

 numerous; bark grayish brown; young branchlets light green, 



