STANDLEY — TREES AND SHRUBS OF MEXICO. 669 



Sonora to Coahuila and Zacatecas. Western Texas to southern Arizona; 

 tj'pe from Texas. 



Densely branched shrub, 1 to 2 meters high ; leaflets 5 to 9, oblong to oval, 

 rounded or obtuse at apex, mucronulate, pilose-strigose ; rachis winged ; in- 

 florescence short and dense; petals 3 mm. long; fruit 6 to 7 mm. in diameter, 

 red. " Correosa " (Coahuila, Durango, Texas); ""agritos" (Cliihuahua; 

 Iruit) ; " agrillo " (Durango, Patoni). 



The fruit is edible, but it is sour and not very palatable. 



10. Ehus potentillaefolia Turcz. Bull. Soc. Nat. Moscou 31': 469. 1858. 

 Guerrero, Puebla, and Oaxaca ; type from Oaxaca. 



Shrub or tree, 4.5 to 7.5 meters high ; leaflets 13 to 21, oblong or narrowly 

 oblong, 1.5 to 7 cm. long, deeply sinuate-lobed, rugose, densely pubescent on 

 both surfaces, sessile ; panicles much shorter than the leaves ; petals 2 mm. 

 long ; fruit about 6 mm. in diameter, covered with very long soft reddish hairs. 



A plant of striking appearance, quite unlike any other species of the genus. 



11. Bhus glabra L. Sp. PI. 265. 1753. 



Mountains of Chihuahua. Widely distributed in the United States and 

 Canada. 



Shrub, or sometimes a tree 6 or 7 meters high, with smooth gray bark ; 

 leaflets 11 to 31, oblong or lance-oblong, 5 to 10 cm. long, acuminate, glabrous, 

 pale beneath; flowers greenish, in dense terminal panicles; fruit covered with 

 short red hairs. 



The white sumac is a handsome plant when loaded with ripe fruit. The 

 leaves turn red in autumn. The bark and leaves are much used in the United 

 States for tanning and dyeing, the leaves containing from 15 to 27 per cent of 

 tannin. The roots also yield a yellow dye. The dried leaves were smoked by 

 many of the Indians, alone or mixed with tobacco. The fruit is edible; it is 

 acidulous and contains malic acid. The dried fruit is official in the U. S. 

 Pharmacopoeia, its decoction or fluid extract being astringent and refrigerant 

 and employed as a gargle for sore throat and for other purposes. The Pawnee 

 Indians employed a decoction of the fruit for dysmenorrhoea and dysentery 

 and a decoction of tlie roots for urinary troubles. 



12. Rhus trilobata Nutt. ; Torr. & Gray, Fl. N. Amer. 1: 219. 1838. 

 Rhus schmidcUoides Schlecht. Linnaea 16: 482. 1842. 



''Rhus crenatifoUa Schlecht. Linnaea 16: 483. 1842. 



Schmultzia trilohata Small, Fl. Southeast. U. S. 728. 1903. 



Schmalizia glauca Greene, Leaflets 1: 138. 1905. 



Schmultzia scaierula Greene, Leaflets 1: 138. 1905. 



Schmalfzia ribifolia Greene, Leaflets 2: 156. 1911. 



Baja California to Chihuahua, Guanajuato, Hidalgo, and Colima. Western 

 United States. 



Shrub, 1 to 2.5 meters high; leaflets mostly rhombic, 1.5 to 5 cm. long, ir- 

 regularly lobed and crenate, beneath densely pubescent or glabrate, the leaflets 

 all essentially sessile; inflorescence short and dense; flowers greenish yellow; 

 fruit 5 to 6 mm. in diameter, bright red. "Agrillo" (Durango); " lemita " 

 (New Mexico). The most common English name is " skunkbush." 



The species is an extremely variable one in pubescence and leaf form, and 

 many segregates have been proposed. Few, if any, of these can be recognized 

 as species, for the characters seem to intergrade in every direction. The most 

 remarkable form of the species is that with simple leaves, which, in Mexico, is 

 known only from Baja California. Specimens from that region were named 

 Schmaltzia ribifolia Greene, but the form has received several earlier names. 

 Simple and trifoliolate leaves are often found upon the same plant 



