672 CONTRIBUTIONS FROM THE NATIONAL. HERBARIUM. 



15, 3 to 10 mm. long, oval or oblong, entire or crenate-lobate, puberulent; 

 flowers dioecious, paniculate at the ends of the branches, yellowish, pink, or 

 red ; petals accrescent, 5 mm. long, acute ; fruit shorter than the petals, 

 pubescent. " Copalquin," " torote bianco." 



A remarkable plant, the only species of the genus. It is leafless for most of 

 the year. The wood is soft and porous and soon decays. The sap is milky 

 and on exposure soon hardens into a gum or resin. Considerable quantities 

 of the bark have been exported to Europe for use in tanning. For a more com- 

 plete account of the tree, and illustrations, see Contr. U. S. Nat. Herb. 16: 

 344-345. pi 118. 1916. 



80. JULIAITIACEAE. Juliania Family. 



Only one other genus of the family is known, Orthopterygium Hemsl., repre- 

 sented by a single Peruvian species. 



1. AMPHIPTERYGITJM Schiede ; Schlecht. Linnaea 17: 635. 1843. 



References : Hemsley & Rose, Diagnoses specierum generis JiiUania, Schlecht, 

 Americae tropicae. Annals of Botany 17: 443-446. 1903; Hemsley, Phil. Trans. 

 Roy. Soc. London B. 199: 169-197. pi. 18-2J,. 1907; Alcocer, Las Julianaceas, 

 Anal. Mus. Nac. Mex. II. 4: 318-327. 1907. 



Trees or shrubs ; leaves alternate, deciduous, pinnate or rarely simple, the 

 leaflets opposite, toothed ; flowers dioecious, the staminate small, in axillary 

 panicles, the perianth 6 to 8-parted; stamens as many as the perianth seg- 

 ments; pistillate flowers consisting of only a pistil, usually in groups of 4 on 

 a receptacle; fruit indehiscent, hardened, the fruiting pedicels flat and wing- 

 like, becoming very large ; seed 1. 



Leaflets glabrous beneath and glaucous 1. A. glaucum. 



Leaflets densely pubescent beneath, green. 



Leaflets usually 7 or 9, gradually acute or acuminate 2. A. amplif olium. 



Leaflets 1 to 7, rounded, obtuse, or abruptly short-pointed at apex. 



Young leaflets densely villous 3. A. molle. 



Young leaflets thinly pilose or hirsute. 



Leaves 3 to 7-foliolate 4. A. adstringens. 



Leaves all or mostly simple 4a. A. adstringens simplicifolium. 



1. Amphipterygium glaucum Hemsl. & Rose, Annals of Botany 17: 444. 1903. 

 Juliania glaiica Hemsl. & Rose, Annals of Botany 17: 444. 1903. 



Known only from the type locality, Jilotlfln, Michoaciin. 

 Leaflets 3 or 5, 3.5 to 7.5 cm. long, acute or abruptly acute, obtuse or cuneate 

 at base, crenate ; fruiting pedicels 3 to 5 cm. long, glaucous. 



2. Amphipterygium amplif olium Hemsl. & Rose, Annals of Botany 17: 444. 



1903. 



Juliania amplif olia Hemsl. & Rose, Annals of Botany 17: 444. 1903. 



Durango and Jalisco ; type from barranca near Guadalajara, Jalisco. 



Small tree; leaflets lanceolate or ovate-lanceolate, 5 to 11 cm. long, coarsely 

 serrate or crenate-serrate, densely pilose or in age glabrate ; fruit puberulent or 

 glabrate, 4 to 5.5 cm. long, the pedicel nearly 3 cm. broad. 



3. Amphipterygium molle (Hemsl.) Hemsl. & Rose, Annals of Botany 17: 



444. 1903. 

 Juliania mollis Hemsl. in Hook. Icon. PI. 28: pi. 2722. 1901. 

 Known only from the type locality, barranca near Guadalajara, .Jalisco. 

 Leaflets 3 or 5, oblong to suborbicular, 2.5 to 5 cm. long, crenate-dentate or 

 serrate. 



