STANDLEY TREES AND SHRUBS OF MEXICO. 537 



15. CHOISYA H. B. K. Nov. Gen. & Sp. 6: 4. 1S23. 

 Reference: Standley, Proc. Biol. Soc. Washington 27: 221-224. 1914. 

 Unarmed shrubs; leaves opposite or subopposite, persistent, digitately 3 to 

 13-foIiolate; flowers perfect, white, in axillary cymes; fruit of 3 or 5 carpels. 



Leaflets 3, oblong to ovate, 5 to 30 mm. wide 1. C. ternata. 



Leaflets 5 to 13, linear, 1 to 4 mm. wide. 



Pubescence of the pedicels of minute appressed hairs. Leaflets S to 13. 



2. C. dumosa. 

 Pubescence of the pedicels of slender spreading hairs. 



Leaflets 3 to 5, 2 to 4 mm. wide, broadest at or abnve the middle, the 



margins plane or nearly so, repand-denticulate 3. C. mollis. 



Leaflets usually 7 to 11, rarely 5, 1.3 mm. wide or narrower, of uniform 

 width throughout, the margins strongly revolute, entire or nearly so. 



4. C. palmeri. 



1. Choisya ternata H. B. K. Nov. Gen. & Sp. 6: 6. 1823. 

 JnUania caryophillata Llave & Lex. Nov. Veg. Descr. 2: 4. 1825. 



Puebla and Oaxaca ; reported from San Luis PotosI and the Valley of 

 Mexico ; often cultivated in gardens. 



Aromatic shrub ; leaflets 2 to 8 cm. long, rounded or emarginate at apex, 

 entire, glabrate; petals white, 1 to 1.5 cm. long. " Hierba del clavo " (Oaxaca, 

 San Luis PotosI, Valley of Mexico); " flor del clavo" (Valley of Mexico, 

 Ramirez) ; " clavillo," "clavo de olor " (Conzatti). 



The infusion of the plant is reputed to have antispasmodic properties. 



2. Choisya dumosa (Torr.) A. Gray, Proc. Amer. Acad. 23: 224. 1888. 

 Astrophylhim dumosurn Torr. U. S. Rep. Expl. Miss. Pacif. 2^: 161. 1854. 

 Chihuahua and Coahuila. Western Texas and southern New Mexico ; type 



from New Mexico. 



Shrub, 1 to 1.5 meters high, the branches and petioles roughened with large 

 glands; leaflets 1 to 4 cm. long; petals about 8 mm. long. " Zorrillo " (New 

 Mexico). 



3. Choisya mollis Standi. Proc. Biol. Soc. Washington 27: 223. 1914. 



Known only from the type locality, which is not definitely known but is 

 probably in northern Sonora. 



Leaflets 1.2 to 4 cm. long, rounded at apex. 



4. Choisya palmeri Standi. Proc. Biol. Soc. Washington 27: 234. 1914. 

 Coahuila and Zacatecas; type from Chojo Grande, Coahuila. 

 Leaflets 0.6 to 1.7 cm. long ; follicles 5 to 6 mm. long, glandular. 



16. MEGASTIGMA Hook. f. ; Benth & Hook. Gen. PI. 1 : 299. 1862. 



1. Megastig'ma galeottii Baill. Adansonia 10: 331. 1872. 



Fac/ara puinila Engl. Bot. Jahrb. Engler 21: Beibl. 54: 21. 1896. 



Puebla and Oaxaca ; type from cactus plains of Oaxaca. 



Small straggling shrub with crooked branches ; leaves alternate, pinnate, 

 the leaflets 5 or 7, ovate to orbicular, 3 to 7 mm. long, entire; flowers white, 

 short-racemose, the petals 2 to 2.5 mm. long ; fruit a follicle, 2.5 to 3 mm. 

 in diameter. 



17. POLYASTEB, Hook, f . ; Benth. & Hook. Gen. PI. 1: 299. 1862. 

 1. Poly aster boronioides Hook, f . ; Benth. & Hook. Gen. PI. 1: 299. 1862. 



IZanthoxylum inerme Sesse & Moc. PI. Mex. ed. 2. 230. 1894. 

 Polyastcr ehrenbergii Engl. Bot. Jahrb. Engler 21: Beibl. 54: 26. 1896. 

 Tamaulipas to Hidalgo ; type from Zimap&n, Hidalgo. 



