Zanthoxylum 



RUTACEAE 



Zanthoxylum 



B. Fr. dehiscent, of 1-seeded follicles 1. Zanthoxylum 



BB. Fr. indehiscent, a hesperidum. 



Lvs. deciduous, or nearly so, trifoliolate 2. Poncirus 



Lvs. evergreen, entire or 1-foliolate. 



Ovary 8-15-celled, with several ovules in each cell 3. 



Ovary 3-5-celled, with 2 ovules in each cell 4. 



AA. Branches unarmed. 

 Lvs. alternate. 



Lvs. up to 3 x compound: fls. in lax leafy panicles: fr. a 



4-5-lobed capsule 5. 



Lvs. simple: fls. in dense terminal panicles: fr. a drupe... 6. 

 Lvs. opposite, pinnately compound: fr. of 4-5 dehiscent fol- 

 licles 7. Evodia 



Citrus 

 Fortunella 



Boenningh a usenia 

 Skimmia 



1. Zanthoxylum Linn. Prickly Ash ttlfcfl (Hua Chiao Shu) 



Aromatic usually prickly shrubs or trees with alternate pinnate or 3-foliolate lvs. 

 fls. dioecious or polygamous; carpels 1-5, 1-seeded, coriaceous or fleshy. About 150 

 species, mostly tropical and subtropical; 30 in China. (Greek: xanthos, yellow; and 

 xylon, wood.) 



Key to the Species 



a. Lvs. 3- or 5-foliolate; rachis broadly winged: thorns flattened, com- 

 monly in paiis at the nodes 1. 



aa. Lvs. with more than 5 lfts. ; rachis slightly or not at all winged: 

 thorns in pairs or alternately arranged, 

 b. Lfts. all with distinct petiolules 2-5 mm. long; If. axis armed 



with hooked thorns 2. 



bb. Lfts., or most of them, sessile or nearly so. 



c. Fls. in terminal panicles; sepals and petals both piesent. 



Lfts. 4-14 cm. long, caudate: thorns on the brs. many, 

 short (1-2 mm. long). 



Lfts. densely tomentose beneath, oblong to ovate 3. 



Lfts. glabrous, glaucous beneath, lanceolate 4. 



Lfts. 0.5-4 cm. long, lanceolate-obovate-orbicular; glabrous 

 or with scattered hairs above, glabrous, light green 



and reticulate beneath 5. 



cc. Fls. in lateral, often axillary panicles; perianth simple; 



petals wanting 6. 



Z. alatum vai. 

 planispinum 



Z. cuspidatum 



Z. molle 



Z. ailanthoides 



Z. schinifolium 

 Z. simulans 



1. Zanthoxylum alatum Roxb. var. planispinum (S. & Z.) Rehd. & Wils. ViM^S. 

 (Chu Yeh Chiao; Bamboo-leaf Pepper) (R.M. 524). Shrub, to 4 m.; fls. yellowish, 

 V-VI; fr. VIII-IX. China., Korea, Japan; locally in An., Che., Hup., Ki., Ku. 



Woodland. 



Since Franchet published the name "subtrifoliatum" as a form of Zanthoxylum alatum 

 (Z. alatum Roxb. forma subtrifoliatum), in his Plantae Delavayanae (1889) 124 and not as a 

 variety, the name Z. alatum Roxb. var. planispinum (S. & Z.) Rehd. & Wils. in Sarg. PL 

 Wils. 2 (1914) 125 is regarded as the valid name for our plant, rather than Z. alatum var. 

 subtrifoliatum Franch. as given by Rehder, Bibliogiaphy (1949) 382. 



2. Zanthoxylum cuspidatum Champ. (Be.F. 58). Shrub, to 5 m.; fls. Ill— IV; fr. 

 IX. Southeastern China; locally in Che., Ki. Forest. 



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