Click on images
Scale bar 10mm. Copyright CSIRO
10th leaf stage. Copyright CSIRO
Cotyledon and 1st leaf stage, hypogeal germination. Copyright CSIRO
Citrus sinensis (L.) Osbeck
Osbeck, P (1765) Reise Ostindien China: 250. Type: ?.
Citrus aurantium (var.) sinensis L., Species Plantarum 2: 782(1753), Type: Europe (cultivated); originally from China, Indo-China & other parts of SE Asia.
Sweet Orange; Orange; Orange, Sweet
A small tree seldom exceeding 30 cm dbh.
Petals glabrous, about 16-18 x 6-7 mm, oil dots yellowish, large and conspicuous, readily visible to the naked eye on the outer surface of the petals. Stamens about 22-25, staminal filaments about 8-10 mm long. Disk at the base of the ovary, inside the whorl of staminal filaments.
First pair of leaves elliptic to +/- orbicular, margins entire, crenate or serrate. At the tenth leaf stage: petiole winged, oil dots clearly visible to the naked eye, leaf blade margins slightly toothed towards the apex.
Distribution and Ecology
Shrub (woody or herbaceous, 1-6 m tall)