STANDLEY — TREES AND SHEUBS OF MEXICO. 705 



1. Thouinia villosa DC. Prodr. 1: 612. 1824. 



Thouinia pringlci S. Wats. Proc. Amer. Acad. 25: 145. 1S90. 



Sonora to Guerrero and Puebla ; type from Cuernavaca, Morelos. 



Shrub or small tree, 3 to 5 meters high, leaflets ovate or rhombic-obovate, 3 

 to 9 cm long, sessile or nearly so, pubescent on both surfaces, irregularly ser- 

 rate ; panicles equaling or shorter than the leaves ; samaras pubescent, about 

 1.5 cm. long. 



The specimens referred here agree very well with Sess6 & Mocino's drawing 

 of the species, and the writer has little doubt that the two names cited are 

 synonymous. 



2. Thouinia acuminata S. Wats. Proc. Amei-. Acad. 25: 145. 1890. 



Jalisco to Oaxaca ; type from the barranca near Guadalajara, Jalisco. A 

 form of the species (var. pubicalyx Radlk.) occurs in Guatemala. 



Tree, 7.5 to 12 meters high; leaflets lanceolate or lance-elliptic, 4 to 10 cm. 

 long, bright green ; panicles about as long as the leaves ; samaras 12 to 14 mm. 

 long. 



3. Thouinia paucidentata Radlk. Field Mus. Bot. 1: 403. 1898. 

 Yucatiln and Campeche. 



Tree, 9 meters high ; leaves long-petiolate ; leaflets lanceolate or lance-elliptic, 

 3 to 5 cm. long ; panicles raceniiform, shorter than the leaves ; samaras 10 to 12 

 mm. long. 



8. DODONAEA Jacq. Enum. PI. Carib. 19. 1760. 



1. Dodonaea viscosa Jacq. Enum. PI, Carib. 19. 1760. 



Dodonaea schiedeana Schlecht. Linnaea 18: 49. 1844. 



Baja California to Chihuahua, Nuevo Leon, Mexico, and Chiapas. Widely 

 distributed in tropical regions. 



Shrub, 1 to 5 meters high ; leaves linear to oblong-oblanceolate, 4 to 12 cm. 

 long, attenuate to the base, petiolate or sessile, acute to rounded at apex, pube- 

 scent or glabrous beneath, viscid; flowers yellowish, unisexual, dioecious. In 

 small lateral corymbs ; calyx 3 to 5-lobed ; petals none ; stamens 5 to 8 ; fruit 

 a 3-winged capsule, 3-celled, 1.5 to 2.5 cm. broad, each cell unusually 1-seeded. 

 "Oeotillo" (Guanajuato, Hidalgo); " chapuliztoli " or " chapulizle " (Nahuatl, 

 from chapul-ichtli= grasshoi)i)er-\- fiber ; it is said that the leaves are much 

 eaten by grasshoppers); " piriniu " (Michoacan, Tarascan) ; " granadina " or 

 " grenadina " (Baja California) ; " jarilla " (Oaxaca, Morelos) ; " hierba de la 

 cucaracha " (Durango, Patoni) ; " cuerno de cabra " (Oaxaca, Seler) ; " ayuelo " 

 (Colombia) ; " chamiso " (Porto Rico, Argentina, Uruguay) ; " gitaran " (Porto 

 Rico) ; " varal," "munditos " (Hidalgo). 



The species, as is to be expected from its wide range, is a variable one, 

 especially in leaf form. The form with linear leaves, occurring in northern 

 Mexico, is D. viscosa angustifolia (L. f.) Benth, The English name is " switch- 

 sorrel " ; in the Bahamas the name " candlewood " is used. The leaves are 

 bitter and in various regions are used for fevers, colic, gout, rheumatism, 

 and venereal diseases. The bark is employed in the preparation of astringent 

 baths and fomentations, and the decoction of the wood is reported to have 

 febrifuge properties. The seeds are said to be edible. In Australia the 

 fruits, known as " native hops," were formerly much used as a substitute for 

 true hops (Humulus lupulus L.) in making yeast and beer. The wood is 

 described as brown, close-grained, and hard, and in India it has been utilized 

 for engraving, turning, tool handles, and walking sticks. 

 7808—23 13 



