l(j CITRUS FRUITS AND THEIR CULTURE. 



stiff; thorns alternate, 1 to 1 1-2 inches long, flattened at the 

 base, stout, stiff, sharp; leaves deciduous, trifoliate, leaflets more 

 or less elliptical, crenate or dentate, thin; flower buds enclosed 

 in scales; flowers produced singly or in pairs, axillary, generally 

 appearing before the leaves, but occasionally with (fig. 7) or 

 after them ; sepals five, light greenish yellow, small, oval, pointed, 

 about 1-4 inch long; corolla large, white, 1 1-2 to 1 3-4 inches 

 across when expanded; petals obovate, thin, striated, polypetal- 

 ous; stamens twenty-one to twenty-three, filaments separate, 

 anthers adnate, oval two-celled; pistil oblong, club-shaped, 

 hairy, style short; ovary six-loculed; fruit light orange, rough, 

 covered with short hair; oil of the rind aromatic, sticky; pulp 

 rather sparse, acid; juice sacks slender, pointed; seeds numer- 

 ous, distinct from other citrus, oval, rounded at the ends, plump, 

 embryo one; time of flowering variable, extending in the citrus 

 districts from the first of March to the middle of April; fruit 

 ripening in September and October; tree very hardy, native of 

 China and Japan. 



Citrus vulgaris Risso, Ann. Mus., Paris, XX: 190, 1813. 

 Seville orange, Bigarade orange, Sour orange. A small tree, 

 twenty to thirty feet in height, with a dense, compact head; 

 young shoots light green, thorny; thorns alternate, small, sharp 

 pointed; on older wood larger, strong, stiff; leaves unifoliate, 

 evergreen, alternate, ovate, pointed, strongly and peculiarly 

 scented; petiole 1-2 to 3-4 inch long, broadly winged; flowers in 

 small axillary cymes, white, strongly sweet scented, somewhat 

 larger than those of Citrus aurantium; calyx cupped, segments 

 four to five, blunt; petals linear oblong, conspicuously dotted 

 with oil cells; stamens twenty to twenty-four, filaments united 

 in groups; pistil club-shaped, smooth, ovary six to fourteen loc- 

 uled; fruit orange colored or frequently reddish when well 

 matured, inclined to be rough; rind strongly aromatic, bitter; 

 pulp acid, juice sacks spindle-shaped, rather small; seeds flat- 

 tened and wedged toward the micropylar end, marked with ridged 

 lines. Native of southeastern Asia, probably in Cochin China. 

 Hardier than the sweet orange. Introduced into Florida at an 

 early date and now naturalized in many of the forests. 



Citrus AiirflTiMn^T, Sp. PL 2:782, 1753. Sweet orange. A 

 tree twenty-five to forty feet in height with a compact, conical 



