STAITDLEY — TKEES AND SHRUBS OF MEXICO. 841 



flowers, in particular, seem to be remarkably uniform in their structure. The 

 leaves, however, are unusually variable in form. 



Leaves velutinous-pilosulous beneath 1. M. velutinum. 



Leaves glabrous beneath. 

 Pedicels glabrous. 



Sepals glabrous on the outer surface, ciliate 2. M. celastrinum. 



Sepals minutely pubescent on the outer surface or, if glabrous, not ciliate. 



3. M. fl.exuosum. 

 Pedicels puberulent or pilosulous. 



Pedicels fasciculate 4. M. ellipticum. 



Pedicels short-racemose 5. M. horridum. 



1. Myroxylon velutinum (Tulasne) Warb. in Engl. & Prantl. Pflanzenfam. 3*^: 



41. 1893. 



Flacourtia velutina Tulasne, Ann. Sci. Nat. III. 7: 295. 1847. 



Xylosma velutinum Triana & Karst. ; Karst. Fl. Columb. 1 : 123. pi. 97. 1858. 



Sinaloa to Jalisco and Veracruz. Central America and Colombia ; type from 

 Colombia. 



Shrub about 3.5 meters high, armed with slender spines ; leaves mostly 

 elliptic, 3.5 to 6 cm. long, 2 to 4 cm. wide, obtuse or rounded at apex, acute or 

 obtuse at base, pilosulous on both surfaces but often glabrate above, crenate- 

 serrate ; pedicels fasciculate, pilosulous ; fruit glabrous, black, 7 mm. long. 



2. Myroxylon celastrinum (H. B. K.) Kuntze, Rev. Gen. PI. 1: 44. 1891. 

 Flacourtia celastrina H. B. K. Nov. Gen. & Sp. 7: 239. 1825. 



Prockia ohovata Presl, Rel. Haenk. 2: 94. 1836. 



Xylosma palmeri Rose, Contr. U. S. Nat. Herb, 1 : 303. pi. 26. 1895. 



Colima and Guerrero ; type from Acapulco, Guerrero. 



Very spiny shrub or tree ; leaves elliptic, rhombic-ovate, or cuneate-obovate, 

 3 to 5 cm. long, 1.5 to 2.5 cm. wide, obtuse to short-acuminate, coarsely crenate 

 or crenate-serrate, lustrous, coriaceous, turning dark when dry ; flowers fascicu- 

 late, short-pedicellate ; fruit subglobose, 5 to 6 mm. in diameter, red or black, 

 containing 2 to 4 seeds, glabrous. 



This species was referred by Hemsley incorrectly to Xylosma nitidum 

 (Hellen.) A. Gray. 



3. Myroxylon flexuosum (H. B. K.) Kuntze, Rev. Gen. PI. 1:44. 1891. 

 Flacourtia flexuosa H. B. K. Nov. Gen. & Sp. 7: 239. 1825. 

 Hisingera cinerea Clos, Ann. Sci. Nat. lA^. S: 223. 1857. 



Hisingera paliurus Clos, Ann. Sci. Nat. IV. 8: 227. 1857. 



Xylosma lanceolatum Turcz. Bull. Soc. Mat. Moscou 36^: 553. 1863. 



Xylosma cinereum Hemsl. Biol. Centr. Amer. Bot. 1: 57. 1879. 



Xylosma flexuosum Hemsl. Biol. Centr. Amer. Bot. 1:57. 1879. 



Xylosma pringlei Robinson, Proc. Amer. Acad. 26: 164. 1891. 



Tepic to Nuevo Leon, Veracruz, and Chiapas ; type from Jalapa, Veracruz. 

 Guatemala. 



Spiny shrub or small tree, 1 to 6 meters high, nearly glabrous throughout; 

 leaves elliptic-oblong to elliptic-ovate or obovate, 2.5 to 6 cm. long, 1.5 to 3 cm. 

 wide, obtuse to acuminate, acute to rounded at base, coriaceous, serrate or 

 subentire; flowers fasciculate, the pedicels 1.5 to 5 mm. long; fruit red, sub- 

 globose, 5 to 6 mm. in diameter. " Manzanillo " (Veracruz); " coronilla " 

 (Oaxaca) ; " huichichiltemel " (San Lois Potosi, Seler). 



Seler reports that in San Luis PotosI the plant is employed as a remedy for 

 tuberculosis. 



The specimens referred here by the writer are variable in shape of leaves 

 and length of pedicels, but no reliable characters have been found by which 

 any of the several proposed segregates can be recognized. 



