STANDLEY TEEES AND SHRUBS OF MEXICO. 629 



17. Acalypha macrostachyoides Muell. Arg. in DC. Prodr. 15^: 809. 1866. 

 Veracruz. 



Shrub, 2.5 to 4.5 meters high; leaves broadly ovate, 8 to 13 cm. long, acumi- 

 nate, serrate, densely velvety-pubescent; pistillate spikes often longer than 

 the leaves ; ovary smooth, hispidulous. 



18. Acalypha flavescens S. Wats. Proc. Amer. Acad. 26: 149. 1891. 

 Known only from the type locality, Tamasopo Canyon, San Luis Potosl. 

 Shrub, 1.5 to 3 meters high ; leaves ovate, 7 to 16 cm. long, long-pedunculate, 



cuspidate-acuminate, finely velutinous beneath; bracts about 7-dentate; ovary 

 densely pubescent. 



19. Acalyplia rafaelensis Standi., sp. nov. 



Type from Agua del Medio, Minas de San Rafael, San Luis Potosl {Purpus 

 5478; U. S. Nat. Herb. no. 463984). 



Slender shrub, the branches brownish, densely pilose when young; stipules 

 setaceous, 6 to 10 ram. long; petioles 1.2 to 2.5 cm. long, slender or stout; 

 leaf blades ovate or lance-ovate, 5 to 10 cm. long, 2.5 to 4.5 cm. wide, acuminate, 

 rounded or subcordate at base, short-hispid above, densely pilose beneath ; pis- 

 tillate inflorescences axillary, each consisting of a single subsessile bract; 

 bracts reniform, about 5 mm. long and 11 mm. broad, 15-dentate, densely pilose, 

 the teeth triangular-ovate, acute; ovary smooth, densely white-hispid, the styles 

 with numerous dark red branches. 



No other Mexican species has a pistillate inflorescence like that of the present 

 plant. In a few species it is reduced to a single bract, but in those cases the 

 bract is borne on a long slender peduncle. 



20. Acalyplia leptoclada Benth. Bot. Voy. Sulph. 164. 1844. 

 Known only from the type locality, between San Bias and Tepic. 



Leaves ovate-lanceolate, 5 to 7 cm. long, acuminate, coarsely dentate, pubes- 

 cent ; spikes about as long as the petioles ; ovary hispid. 



21. Acalypha oligantha Muell. Arg. Linnaea 34: 159. 1865. 



Known only from the original localities, Santa Maria Tlapacoyo and Paso 

 del Correo, banks of the Rio Tecolata, Veracruz. 



Leaves lance-elliptic, 7 to 10 cm. long, acuminate, appressed-denticulate, 

 soon glabrate; staminate spikes slightly shorter than the leaves; pistillate 

 spikes scarcely equaling the petiole; ovary smooth, puberulent. 



22. Acalypha acapulcensis Fernald, Proc. Amer. Acad. 33: 87. 1897. 

 Known only from the type locality, Acapulco, Guerrero. 



Very slender shrub with dark brown branches ; leaves ovate or lance-ovate, 

 2 to 5 cm. long, long-acuminate, crenate-dentate, glabrate; staminate spikes 

 2 cm. long or less; pistillate spikes sessile, 2 to 4 cm. long; capsule hispid. 



23. Acalypha dioica S. Wats. Proc. Amer. Acad. 25: 162. 1890. 

 Known only from the type locality, near Monterrey, Nuevo Le6n. 



Stems suffrutescent, 30 to 60 cm. high ; leaves lance-ovate, 3 to 6 cm. long, 

 acuminate, crenate-serrate, pubescent ; staminate spikes long-pedunculate, about 

 equaling the leaves ; pistillate spikes lax, with 3 to 8 bracts ; capsule pubescent. 



24. Acalypha comonduana Millsp. Proc. Calif. Acad. II. 2: 222. 1889. 

 Baja California ; type from Comondti. 



Slender shrub; leaves broadly ovate, 5 to 11 cm. long, acute or acuminate, 

 crenate-dentate, pubescent or glabrate ; pistillate spikes equaling or longer 

 than the petioles, the bracts distant. 



