Zanthoxylum RUTACEAE Citrus 



3. Zanthoxylum molle Rehd. apud Rehd. & Wils. (AA.J. 8:150). Tree, to 10m; 

 fls. white, VII-VIII. China; locally in An. Valley woodland. 



4. Zanthoxylum ailanthoides Sieb. & Zucc. (Sch. H. 2:121). Tree, to 15 m.; fls. 

 greenish white, VIII-IX; fr. IX-X. Japan, China, Korea; locally in Che. Slopes 

 near the sea shore. 



5. Zanthoxylum schinifolium Sieb. & Zucc. Mfe (Yai Chiao; Cliff -pepper) (R.M. 

 524). Shrub, to 3 m.; fls. V; fr. IX-X; lfts. sessile. China, Korea, Japan; locally 

 in An., Che., Ki., Ku. Woodland. 



6. Zanthoxylum simulans Hance (Z. bungei Hance 1875, not 1866) ftjfe (Hua Chiao; 

 Flower-pepper) (R.M. 524). Glabrous shrub or tree, to 7 m.; fls. V-VI; fr. IX-X. 

 China; locally in An., Che., Ki., Ku. Woodland. 



Zanthoxylum setosum Hemsl. appeals to be merely a form of Z. simulans with a varying 

 number of setae on the upper suiface of the leaflets. This species was described from material 

 collected near Kiukiang, Kiangsi. Fruiting specimens and those with staminate flowers were 

 available, but pistillate flowers are also needed to conclude a study on this variable group. 



2. Poncirus Raf. f^jflM (Kou Chii Shu) 

 Thorny shrub or small tree, deciduous or nearly so: Ivs. alternate, trifoliolate: 

 fls. borne on old wood in the early spring: fr. densely pubescent, a 6-8-celled 

 hesperidium; pulp vescicles with hair-like appendages. 1 species, in China. (French: 

 poncire, a kind of citron). 



1. Poncirus trifoliata (L.) Raf. Trifoliate Orange $M (Kou Chii: Spiny Orange) 

 (R.M. 530). Shrub, to 7 m.; fls. white, IV-VI; fr. VIII-X; brts. spiny and com- 

 pressed. North China, Korea; locally in An., Hon., Hup., Ki., Ku. Planted, 

 hedges. Fig. 199. 



3. Citrus Linn. ;)#PM (Kan Chii Shu; Mandarin Orange Genus) 

 Evergreen [glabrous often spiny trees and shrubs with coriaceous alternate 1- 

 oliolate Ivs.; petiole often winged: fls. axillary, solitary, or fascicled, white, usually 

 perfect; stamens 15 or more: fr. an 8-15-celled hesperidium: seeds usually several 

 in each cell. 12 species, tropical Asia and Malaysia; 11 in China. (The ancient name 

 of an aromatic African wood.) 



Key to the Species 

 a. Fr. large, 7 or more cm. in diam.: Ivs. 8-10 cm. long; petiole bioadly 



winged: stamens 36 1- C. grandis 



aa. Fr. small, 4-6 cm. in diam.: stamens 20-25. 



Fr. skin tight: fls. about 1cm. long: Ivs. ovate to oblong, 8-10 cm. 



long ; petioles broadly winged 2. C. aurantium 



Fr. skin loose: fls. less than 1cm. long: Ivs. elliptic-oblong, 5-8 

 cm. long; petiole narrowly winged, or scarcely at all winged. 



Petioles narrowly winged, 5-10 mm. broad 3. C. junos 



Petioles thin, scarcely winged 4. C. reticulata 



1. Citrus grandis Osbeck Pummelo (B.M. 610). Tree; fls. white, IV; fr. pale yellow, 

 XI. Asia; locally in An., Che., Ki., Ku. Cultivated, fruit. 



2. Citrus aurantium Linn. Sour Orange ftftffj (Tai Tai Hua; Flower-of-the-gene- 

 rations) (B.M. 610). Tree; fls. white, IV; fr. orange-yellow, IX. Asia; locally 

 in Ki., Ku. Cultivated, flowers, fruit. 



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