704 CONTRIBUTIONS FEOM THE NATIONAL HEEBARIUM. 



5. ALLOPHYLUS L. Sp. PI. 348. 1753. 



Erect shrubs or trees; leaves alternate, persistent or deciduous, usually 

 3-foliolate, the leaflets toothed ; flowers polygarao-dioecious, in simple or panicu- 

 late racemes ; sepale 4 ; petals 4 ; stamens 8 ; ovary usually 2-celled ; fruit 

 usually of a single dry or fleshy, 1-seeded carpel. 



Racemes rarely exceeding the petioles ; leaflets large, 9 to 20 cm. long, thin. 



1. A. occidentalis. 



Racemes usually equaling or longer than the leaves ; leaflets mostly 5 to 10 cm. 



long, thick 2. A. cominia, 



1. Allophylus occidentalis (Swartz) Radlk. Sitzungsb. Akad. Wiss. Miinchen 



20: 230. 1890. 



Schmidelia occidentalis Swartz, Fl. Ind. Occ. 2: 6G5. 1800. 



Chiapas. Central America, West Indies, and northern South America. 



Shrub ; leaflets elliptic or oblanceolate, acuminate, irregularly sinuate-serrate, 

 sparsely pubescent beneath ; racemes pubescent ; fruit red, 6 to 8 mm. long, 

 obovoid, nearly dry. "Palo bianco," " quiebra-hacha " (Porto Rico). 



2. Allophylus cominia (L.) Swartz, Pi'odr. Veg. Ind. Occ. 62. 1788. 

 Rhus cominia L. Syst. Nat. Veg. ed. 10. 964. 1759. 



Schmidelia cominia Swartz, Fl. Ind. Occ. 2: 697. 1800. 



Tabasco. Cuba, Jamaica, and Hispaniola. 



Shrub, or small tree ; leaflets elliptic or obovate, serrulate, pubescent on both 

 surfaces, densely so beneath, acute or short-acuminate; racemes branched, 

 densely pubescent ; fruit orange or red, 4 mm. long, subglobose, nearly dry. 



6. UNGNADIA Endl. Atact. Bot. pi. 36. 1833. 



A single species is known. 

 1. ITngnadia speciosa Endl. Atact. Bot. pi. 36.. 1833. 



Chihuahua, Coahuila, and Nuevo Leon. Texas and southern New Mexico. 



Shrub or tree, sometimes 10 meters high, with a trunk 20 cm. in diameter ; 

 bark thin, light gray; leaves alternate, deciduous, pinnate; leaflets 3 to 7, 

 lanceolate or ovate, 5 to 12 cm. long, acuminate, pubescent beneath when young 

 but soon glabrate ; flowers purplish pink, in lateral clusters ; calyx deeply 

 5-lobed ; petals 4 or 5, obovate, clawed, nearly 1 cm. long; stamens 7 to 10; 

 fruit a 3-lobed capsule, about 5 cm. thick, 3-valvate ; seeds black and lustrous, 

 1 to 1.5 cm. in diameter. " Monillo " or " monilla " (Chihuahua, Nuevo Leon, 

 Tamaulipas). 



The flowers are sweet-scented. The seeds have a pleasant flavor, but they 

 :>re poisonous. Havard states that an adult can eat one or two with impunity, 

 but three or four produce giddiness and a sensation of heat and discomfort in 

 the stomach. The seeds are sometimes used by boys as marbles. In Texas 

 the plant is known as " Texas buckeye," " Spanish buckeye," or " Mexican 

 buckeye." 



7. THOUINTA Poit. Ann. Mus. Hist. Nat. 3: 70. 1804. 



Erect trees or shrubs; leaves 3-foliolate, the leaflets serrate; flowers small, 

 symmetric, in lateral panicles ; sepals and petals each 4 ; stamens 8 ; fruit of 2 

 or 3 samaras, each of these 1-seeded. 



Leaflets densely pubescent beneath, usually obtuse 1. T. villosa. 



Leaflets glabrous beneath, except in the axils of the veins, acute or acuminate. 

 Fruit glabrous or nearly so; terminal leaflet long-stalked; leaflets closely 



crenate-serrate 2. T. acuminata. 



Fruit finely pubescent ; terminal leaflet nearly sessile ; leaflets with a few 

 irregular remote teeth 3. T. paucidentata. 



