STANDLEY TKEES AND SHRUBS OF MEXICO. 699 



36. Serjania incisa Torr. U. S. & Mex. Bound. Bot. 47. 1859. 

 Type from Santa Rosa, Coahuila. Western Texas. 



Stems hirtellous or glabrate; leaflets ovate-rhombic, 1 to 3 cm. long, acute, 

 incised-dentate, puberulent ; outer sepals glabrate, tlie inner puberulent ; petals 

 4 mm. long ; fruit 3.5 cm. long, 2 cm. wide, subacute at apex, glabrate. 



37. Serjania sphenocarpa Radlk. Monogr. Serjan. 269. 1875. 

 Known only from the original collection, this probably from Sonora. 



Stems pubescent ; leaflets lanceolate, 1.5 to 3 cm. long, acute, remotely in- 

 cised-dentate, pubescent ; sepals puberulent ; fruit 1.5 cm. long, 8 to 9 mm. wide, 

 pubescent. 



38. Serjania cystocarpa Radlk. Erganz. Monogr. Serjan, 186, 1886. 



Serjania inflata S. Wats. Proc. Amer. Acad. 17: 373. 1882, Not S. inflata 

 Poepp. & Endl. 1844. 



Coahuila, Nuevo Leon, and San Luis Potosi ; type from Caracol Mountains, 

 near Monclova, Coahuila. 



Stems puberulent ; leaflets lance-ovate to ovate-elliptic, 1 to 3.5 cm. long, 

 obtuse or acute, crenate or incised-dentate, pilosulous ; sepals puberulent ; fruit 

 pilosulous when young, becoming glabrate. 



39. Serjania pacifica Standi., sp. nov. 



Sinaloa and Tepic ; type from Acaponeta, Tepic {Rose, Standley d Rxissell 

 14189; U. S. Nat. Herb. no. 637046). 



Stems pilosulous, 5-sulcate; leaves bipinnate, the 2 lower pinnae trifoliate, 

 the 2 upper pairs of leaflets and the terminal one simple ; leaflets oblong-ovate, 

 ovate, or oblong-oval, 2 to 6 cm. long, obtuse or acute, puberulent beneath, 

 remotely crenate-serrate or subentire ; sepals puberulent ; petals 2.5 mm. long ; 

 fruit reddish, 10 to 12 mm. broad, the wings glabrous, the cells thinly hirtel- 

 lous or glabrate. 



2. URVILLEA H. B. K. Nov. Gen. & Sp. 5: 105. 1821. 



Scandent shrubs, often with tendrils in the inflorescence and leaf axils; 

 leaves trifoliolate or bitemate, the leaflets toothed and lobed ; flowers whitish, 

 in axillary racemes, irregular, polygamo-dioecious ; sepals 5, the 2 outer ones 

 small ; petals 4 ; stamens 8 ; fruit thin, 3-angled, the angles winged ; seed 1 

 in each cell. 



Leaves trifoliolate 1. TJ. ulmacea. 



Leaves biternate 2. U. biternata. 



1. Urvillea ulmacea H. B. K. Nov. Gen. & Sp. 5: 105. pi. k'fi. 1821. 

 Urvillea mexicana A. Gray, PI. Wright. 1: 38. 1852. 



Nuevo Leon to Yucatan, Oaxaca, and Tepic. Western Texas ; Central Amer- 

 ica and northern South America ; type from Caracas, Venezuela. 



Large scandent shrub ; leaflets ovate, rhombic-ovate, or deltoid, 3 to 7.5 cm. 

 long, acute or acuminate, densely pubescent or tomentose beneath, crenate 

 and often lobate ; racemes long-pedunculate, longer thaij the leaves ; fruit 

 elliptic, 2 to 3 cm. long, narrowed at each end, pubescent or glabrate. "Apaac " 

 (YucatSn, Maya). 



2. Urvillea biternata Weatherby, Proc. Amer. Acad. 45: 425. 1910. 



Known only from the vicinity of the type locality, Iguala Canyon, Guerrero. 



Erect (?) shrub, 1 to 2 meters high; leaflets elliptic, acuminate, nearly gla- 

 brous ; racemes shorter than the leaves ; fruit glabrous, 2.5 to 3 cm. long, 2 to 

 2.5 cm. wide. 



