128 
THALAMIFLOR*. 
5. Citrus aurantium. Sweet Orange. 
Petioles subalate, leaves ovate acuminate with 
the apex obtuse remotely crenulato-serrulated, stamens 
20-2*2, fruit globose with the rind thin and the pulp 
sweet. 
Risso, Ann. Mus. XX. 181. t. 1. f. 1. & 2. — De Cand. Prod. I. 
539. — Rot. Miscel. I. 301. 
HAB. Cultivated and naturalized. 
FL. January — April. 
A tree, 20-25 feet in height, with the branches forming a 
spherical figure, towards their extremities 3-gonal, glabrous. 
Leaves ovate, indistinctly and bluntly serrulated, glabrous, 
pellucido-punctate, marked with green dots beneath. Wings 
of the petioles narrow. Spines axillary ; in trees, producing 
the finer varieties of fruit, short. Flowers axillary, sometimes 
solitary, more usually arranged in racemes, 6-7-flowered : 
pedicels 1 an inch in length, thickened towards the flower, 
terete, articulated a short distance from, or at the insertion, 
where there is a small subulate deciduous bractea. Calyx 
irregularly 3-4-5-fid ; divisions apiculated. Petals 4-5 ; when 
only 4 unequal ; oblong, obtuse, externally virido-punctate, to 
the glass minutely ciliated. Ovary spherical, green : style 
slightly thickened towards the stigma, which is subcapitate. 
Fruit globose; pulp white, sweet. 
The orange is deserving of cultivation, not only on account 
of the excellency of the fruit, but also as being among the 
most ornamental of trees. It is graceful in its port, with leaves 
beautifully formed and of a rich green, and filling the air with 
the perfume of its clusters of delicately white blossoms. 
Var: b. Citrus aurantium vulgaris. Bitter or Seville 
orange. 
Petiole alate, leaves ovate acuminate with the apex 
obtuse remotely crenulato-serrulated, stamens 25, 
fruit globose with the rind thick, and the pulp bitter. 
Rot. Miscel. I. 301. — Citrus Sinensis, Pers. II. 74. — C. 
aurantium, Rot. Reg. t. 346. — C. vulgaris, De Cand. Prod. I. 
539. 
HAB. Cultivated. 
FL. February — April. 
A tree, more lofty than the variety bearing the sweet. fruit. 
Leaves larger than those of the sweet variety, distinctly acu- 
minate : petioles winged. Spines axillary. Flowers in an 
axillary raceme, fragrant. Calyx almost always 5-fid, with the 
teeth somewhat' irregular and acute. Petals usually 5. Stamens 
