616 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



16. Croton amphileucus Briq. Ann. Cons. Jard. Geneve 4:227. 1900. 

 Known only from the type locality, near Real del Monte, Hidalgo, altitude 



2,400 meters. 



Shrub ; leaves elliptic, 10 to 13 mm. long, obtuse, .short-petiolate, densely 

 lepidote on both surfaces, entire; racemes 5 to 10 mm. long. 



Know^n to the writer only from the description. 



17. Croton hypoleucus Schlecht. Linnaea 19: 246. 1847. 

 Croton shepherdiaefolius Schauer, Linnaea 20: 729. 1847. 



Coahulia (?) to Hidalgo; type collected between Zimapan and San Jose 

 del Oro, Hidalgo. 



Shrub ; leaves oblong-ovate, 3 to 4..5 cm. long, petiolate, entire, bright green 

 on the upper surface, very densely silvery-lepidote beneath. 



18. Croton watsonii Standi. 



Croton elacagnoides S. Wats. Proc. Amer. Aead. 26: 147. 1891. Not C. 

 elaeagnoides Balf. 1884. 



Known only from the type locality. Las Palmas, San Luis Potosi. 



Shrub or small tree, 3 to 4.5 meters high ; leaves ovate or lanceolate, 1.5 to 

 5 cm. long, entire, bright green on the upper surface, densely silvery-lepidote 

 beneath; racemes slender, 10 to 15 cm. long; capsule depressed, 5 mm. broad. 



19. Croton jucundus T. S. Brandeg. Zoe 5: 205. 1905. 



Known only from the type locality, Yerba Buena, near Culiacan, Sinaloa. 



Plant soon glabrate, green, very sparsely stellate-pubescent; leaves long- 

 petiolate, .ovate or lanceolate, 6 to 10 cm. long, attenuate, entire, ciliate with 

 long slender gland-tipped hairs. 



Perhaps only a form of C. ciliato-glandulosus. 



20. Croton adspersus Beuth. PI. Hartw. 51. 1840. 



Type from Morelia, Michoacan; reported from Oaxaca, Veracruz, and San 

 Luis Potosi. 



Leaves petiolate, ovate or ovate-lanceolate, 3.5 to 6 cm. long, acuminate, 

 serrulate, stellate-puberulent. " Soliman " (Seler). 



21. Croton soliman Schlecht. & Cham. Linnaea 6: 361. 1831. 

 Veracruz, Tabasco, and Oaxaca; type from Papantla, Veracruz. 



Slender green shrub ; leaves long-petiolate, ovate or rhombic, 5 to 9 cm. long, 

 cuspidate-acuminate, appressed-stellate beneath, obscurely crenate; flowers 

 whitish. "Soliman" (Veracruz). 



22. Croton incaniis H. B. K. Nov. Gen. & Sp. 2: 73. 1817. 



San Luis Potosi to Hidalgo ; type from Los Organos, Actopfln. 

 Shrub, 2 meters high, densely stellate-pubescent; leaves ovate, 1.5 to 3.5 cm. 

 l«ng, obtuse, entire ; racemes 2 to 3 cm. long. 

 Known to the writer only from the description. 



23. Croton suaveolens Torr. U. S. & Mex. Bound. Bot. 194. 1859. 

 ? Croton virletianus Muell. Arg. Linnaea 34: 133. 1865-66. 



Chihuahua, Coahuila, and San Luis Potosi. Western Texas; type collected 

 along the Rio Grande. 



Low, densely branched shrub, densely stellate-tomentose, the pubescence 

 usually yellowisli ; leaves broadly rhombic-ovate, 1 to 3.5 cm. long, obtuse or 

 acutish, thick, entire; racemes short and stout. *' Encinillo " (Chihuahua). 



Plant fragrant, used in baths in convalescence from fevers. 



24. Croton humilis L. Syst. Nat. ed. 2. 1276. 1759. 



Croton ierlandieri Torr. U. S. & Mex. Bound. Bet. 193. 1859. 

 Nuevo Leon to Yucatan. Southern Florida and West Indies. 



