842 CONTEIBUTIONS FROM THE OSTATIONAL HERBARIUM. 



4. Myroxylon. ellipticvun (Clos) Kuntze, Rev. Gen. PI. 1: 44. 1891. 

 Hisingera elliptica Clos, Ann. Sci. Nat. IV. 8: 226. 1857. 

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



Guerrero to Veracruz and Oaxaca ; type from Jalapa, Veracruz. Central 

 America. 



Shrub or tree, 4.5 to 6 meters high ; leaves elliptic, rounded-elliptic, or ellip- 

 tic-obovate, 3 to 7 cm. long, 2 to 4.5 cm. wide, rounded to subacute at apex, 

 acute to very obtuse at base, crenate-serrate, coriaceous, usually lustrous; 

 flowers yellow or reddish, on short or elongate pedicels ; fruit red, glabrous, 

 5 to 6 mm. in diameter. 



5. Myroxylon horridum (Rose) Standi, 



Xylosma horridum Rose, Contr. U. S. Nat. Herb. 1 : 303. 1895. 



MichoacJln and Colima to Oaxaca ; type from Manzanillo, Colima. 



Tree, 5 to 9 meters high, the trunk sometimes 20 cm. in diameter ; spines of 

 the trunk often 8 to 15 cm. long, branched ; leaves oval, elliptic, or rounded, 

 4.5 to 8 cm. long, 3 to 5 cm. wide, obtuse or rounded at apex and base, coriaceous, 

 lustrous, crenate ; flowers greenish white ; fruit globose. " Corona santa," 

 " malacate " ( Oaxaca ) . 



8. SAMYDA L. Sp. PI. 443. 1753. 

 Shrubs or small trees ; leaves deciduous, short-petiolate, entire or serrulate, 

 pellucid-punctulate ; flowers axillary, solitary or fasciculate ; calyx tube tubular- 

 campanulate, the lobes 4 to 6, unequal, imbricate ; petals none ; stamens 8 to 13, 

 inserted in the upper part of the calyx tube, the filaments connate into a tube ; 

 fruit globose, fleshy-coriaceous, 3 to 5-valvate at apex, many-seeded. 



Flowers long-pedicellate; leaves rounded or obtuse at base 1. S. mexicana. 



Flowers sessile or subsessile ; leaves acute or attenuate at base. 



2. S. yucatanensis. 



1. Samyda mexicana Rose, Contr. U. S. Nat. Herb. 5: 199. 1899. 

 Colima and Guerrero ; type from Acapulco. 



Shrub, 1.5 to 2.5 meters high ; leaves oval or oblong-oval, 3 to 7 cm. long, 

 obtuse or acute, serrulate, when young densely pilosulous above and tomentose 

 beneath ; calyx white, densely pilosulous, about 12 mm. long, the lobes 4 or 5, 

 shorter than the tube, rounded at apex. 



2. Samyda joicatanensis Standi., sp. nov. 



Yucatan (type collected by Schott, no. 603; U. S. Nat. Herb. no. 1,073,356). 



Tree, 7.5 to 12 meters high; leaves (immature) short-petiolate, obovate, 

 cuneate-obovate, or oval, rounded at apex or obtuse, attenuate at base or 

 rarely obtuse, thin, entire or obscurely and remotely serrulate, densely pilosu- 

 lous or beneath tomentose; flowers sessile, pilosulous; calyx tube 7 mm. long, 

 the 4 or 5 lobes 1 cm. long, oval-oblong, rounded at apex ; stamen tube 3 to 4 

 mm. long; fruit subglobose, 12 mm. in diameter, on a very short thick pedicel. 

 " Puus mucuy," " aguja de tortola." 



The Yucatan specimens have been referred to S. serrulata L. {=S. dode- 

 candra Jacq.) and to S. rosea Sims, both of which are West Indian species. 

 The Mexican specimens are imperfect, but in leaf characters they are so unlike 

 the specimens of those species examined that it seems safe to describe them 

 as new. 



DOUBTFUL SPECIES. 



Samyda macbocabpa DC. Prodr. 2: 48. 1825. Described from Mexico, the 

 description based upon one of Sesse and Mocino's plates.^ 



Samyda BxreRA DC. Prodr. 2: 48. 1825. This also was based upon one of 

 Sesse and Mocino's plates.' The generic position of both plants is doubtful. 



* DC. Calq. Dess. Fl. Mex. pi. 183. ' DC. Calq. Dess. Fl. Mex. pi. 182. 



