STANDLEY TREES AND SHRUBS OF MEXICO. 221 



2. Pouzolzia nivea S. Wats. Proc. Amer. Acad. 22: 453. 1887. 



Rocky slopes, Jalisco aud Sinaloa to Veracruz ; type from Guadalajara. 



Shrub, 1 to 1.5 meters high; leaves ovate or oval, 3-nerved, very white 

 beneath. 



P. lati folia Wedd.^ was based ou specimens said to have come from Mexico. 

 Its description suggests P. nivea. 



3. Pouzolzia pringlei Greenm. Proc. Amer. Acad. 33: 476. 1998. 

 Puebla and Oaxaca ; type from Tomelliu Canyon, Oaxaca. 

 Shrub similar to the last species but with much smaller leaves. 



5. MYRIOCARPA Benth, Bot. Voy. Sulph. 168. 1844. 



Reference : Weddell in DC. Prodr. 16 ': 235 ''-235 '\ 1869. 



Trees or shrubs ; leaves large, alternate, dentate, pinnately veined and some- 

 what 3-nerved ; stipules connate ; flowers green, dioecious, the long stalks axil- 

 lary, solitary or clustered ; fruit a small acheue. 



Leaf blades ovate-orbicular, cordate at the base 1. M. cordifolia. 



Leaf blades ovate or broadly ovate, obtuse or rounded or rarely subcordate at 

 the base. 



Leaves serrate ; pistillate peduncles slender, glabrate 2. M. longipes. 



Leaves crenate ; pistillate peduncles stout, densely pilose_3. M. brachystach,ys. 



1. Myriocarpa cordifolia Liebni. Dansk. Vid. Selsk. Skrivt. V. 2: 306. 1851. 

 Veracruz and Puebla ; type from forests near Colipa, Veracruz. 



Tree, 4 to 5 meters high ; leaves mostly 20 to 25 cm. long aud nearly as wide ; 

 fruit a small achene. "Mai hombre " (Puebla). 



2. Myriocarpa long'ipes Liebm. Dansk. Vid. Selsk. Skrivt. V. 2: 306. 1851. 

 Myriocarpa coUpensis Liebm. Dansk. Vid. Selsk. Skrivt. V. 2: 306. 1851. 

 Veracruz to Colima and Chiapas. Central America ; type from Costa Rica. 

 Shrub, 2.5 to 6 meters high ; flowers in very long slender spikes. " Cholagogue 



Indlo " (Oaxaca). 



The plant is sometimes used for hedges. In Oaxaca it is employed as a 

 remedy for malaria. 



3. Myriocarpa brachystachys S. Wats. Proc. Amer. Acad. 26: 152. 1891. 

 Jalisco ; type from barranca near Guadalajara. 



Shrub or small tree ; leaves 7 to 17 cm. long, densely pubescent beneath. 

 Myriocarpa stipitata ambigua Wedd.,' described from Veracruz, is perhaps 

 the same as M. longipes. 



6. PHENAX Wedd. Ann. Sci. Nat. IV. 1 : 191. 1854. 



Shrubs ; leaves alternate, petiolate. toothed, 3 or 5-nerved ; stipules free ; 

 flowers green, monoecious, in dense axillary clusters, the bracts brown, scarious ; 

 fruit a compressed achene. 



Leaf blades broadly ovate, thin, coarsely crenate 1. P. hirtus. 



Leaf blades ovate to lance-oblong, thick, finely and closely crenate. 



2. P. mexicanus. 

 1. Phenax hirtus (Swartz) Wedd. in DC. Prodr. 16': 235''. 1869. 



Urtica Jiirta Swartz, Fl. Ind. Occ. 1: 285. 1797. 



Veracruz to Oaxaca. Central America, West Indies, and tropical South 

 America. 



Shrub, 1 to 2 meters high ; leaves mostly 5 to 11 cm. long, green, glabrate, 

 long-petiolate, coarsely crenate. 



'In DC. Prodr. 16': 234. 1869. 'In DC. Prodr. 16': 235 =*. 1879. 



