STANDLEY l-REES AND SHRUBS OF MEXICO. 1241 



16. Citharexylum hexangulare Greenin. Field Mus. Bot. 2: 187. 1907. 

 Veracruz. Guatemala; type from Gubilquitz, Alta Verapaz. 



Glabrous shrub ; leaves often ternate, lanceolate or oblong-lanceolate, 6 to 

 35 cm. long, usually acuminate, acute at base; racemes mostly terminal and 

 paniculate, 10 to 20 cm. long. 



17. Citharexylum pringlei Greenm. Proc. Amer. Acad. 41: 243. 1905. 

 Type from Trinidad Iron Works, Hidalgo, altitude 1,500 meters. 



Shrub, 3 to 4.5 meters high, glabrous ; leaves elliptic to lance-oblong, 3.5 to 7 

 cm. long, acute or obtuse-acuminate, entire, very lustrous above ; racemes ter- 

 minal, simple, nodding, 10 cm. long or less ; corolla 5 cm. long. 



18. Citharexylum afiine Don, Edinburgh New Phil. Journ. 11: 238. 1831. 

 Citharexyhcm jurgenseni Briq. Bull. Herb. Boiss. 4: 342. 1896. 

 Citliarexylum emrickianum Greenm. Field Mus. Bot. 2: 187. 1907. 

 Sinaloa to Oaxaca, Puebla, and Mexico; type from Chalco, Mexico (State). 

 Shrub or tree, 2 to 6 meters high, glabrous, the branchlets quadrangular and 



f^tometimes narrowly winged ; leaves oblong to broadly rhombic-ovate, 5 to 20 

 cm. long, rounded to long-acuminate at apex, acute or obtiise at base, entire; 

 racemes axillary or terminal, nodding, slender, often very long; flowers bluish 

 or violet; fruit 6 to 10 mm. long. "Coral" (G.uerrero) ; " chacalpezle " 

 (Oaxaca) ; " cacachila " (Sinaloa). 



19. Citharexylumi schottii Greenm. Field Mus. Bot. 2: 190. 1907. 

 Yucatan ; type from M^rida. 



Glabrous shrub or tree ; leaves lanceolate, 4 to 10 cm. long, obtuse-acuminate, 

 acute at base ; racemes numerous, slender, 12 cm. long or less ; calyx 2.5 mm. 

 long ; fruits 5 to 7 mm. long. 



This has been reported from Yucatan as C. guadrangulare .Tacq. 



DOUBTFUL SPECIES. 

 Citharexylum pauciflorum T. S. Brandeg. Zoe 5: 236. 1906. 



5. DURANTA L. Sp. PI. 637. 1753. 



1. Duranta repens L. Sp. PI. 637. 1753. 



D'uranta erecta L. Sp. PI. 6.37. 1753. 



Duranta plumieri Jacq. Stirp. Amer. 186. 1763. 



Duranta xalapensis H. B. K. Nov. Gen. & Sp. 2: 255. 1817. 



IDuranta macrocarpa H. B. K. Nov. Gen. & Sp. 2: 255. 1817. 



Baja California and Sinaloa to Chiapas, Puebla, Veracruz, and YucatS,n. 

 Widely distributed in tropical America. 



Shrub or tree, 6 meters high or less, usually armed with spines, the branches 

 slender, often drooping or trailing; leaves opposite or verticillate, short- 

 petiolate, ovate-elliptic, oval, or obovate, 2 to 5 cm. long, obtuse, entire or 

 serrate above the middle; finely pubescent or glabrate; flowers lilac or white, 

 in long loose racemes ; calyx tubular, 4 to 6 mm. long, minutely 5-dentate ; 

 corolla salverform, the limb 8 to 15 mm. broad; fruit globose, yellow, 7 to 11 

 mm. in diameter, inclosed in the accrescent calyx, this produced into a curved 

 beak. " Espina blanca " (Veracruz); " xcambococh^ " (Yucatan, Maj'a) ; 

 " Adonis bianco," " Adonis morado," " garbancillo," " espino negro " (Colombia) ; 



