' r RtfTACEAE 193 



below, 8-12 cm. long, 3-5 cm. wide. Inflorescence glabrous. Fruit 8-10 

 mm. in diameter. 



Saghalien, Korea, Japan and W. China. 

 Phellodendron chinense Schneider. 



Tree S m. tall. Bark gray-brown, not corky. Branchlets purple- 

 brown. Leaflets 7-13, oblong-ovate to oblong-lanceolate, dull yellow- 

 green above, villose beneath, 9-14 cm. long. Inflorescence densely 

 pubescent. Fruit black, 12 mm. in diameter in compact panicles 5-8 cm. 

 long and 2.5-6 cm. wide. 



Central China. 



CITRUS 



Evergreen shrubs or small trees, usually armed with spines. Leaves 

 alternate, pinnate but apparently simple, persistent, coriaceous, punctate, 

 borne on a winged and articulated petiole. Flowers white or pinkish, 

 fragrant, axillary, fascicled or in small cymes, rarely solitary. Calyx 

 3-5 parted, cup or urn shaped; petals 5, (4-8), linear-oblong, thick, 

 imbricate; stamens 20-60, inserted on the disk, variously connate; ovary 

 many celled (8-15), style stout, usually deciduous, with capitate stigma; 

 ovules 4-8 seriate in each cell. Fruit a large, globose or oblong berry 

 with a leathery rind and many cells distended with a juicy pulp; cells 

 1-8 seeded; seeds large, up to 2 cm. long, oval or oblong. 



Extensively cultivated in tropical and subtropical Asia and elsewhere. 

 About 6 species are recognized. The leaves are unifoliate by suppression 

 as indicated by the articulated blade. This is the most important genus 

 of the family, including valuable economic fruits such as the orange, 

 tangerine, pomelo or grape fruit, lemon and lime. 



Citrus medica Linnaeus. 



Citron. 



Thorny shrub or small tree. Leaves to 18 cm. long, oblong, rounded 

 at the apex, not articulated; petiole wingless. Flowers large, white, 

 tinged with reddish purple. Fruit large, oval or oblong, 15-25 cm. long, 

 lemon yellow; skin thick, fragrant; pulp acid and scanty. 



Var sarcodactylis Swingle. 

 Fo Sho or Fingered Citron. 



