694 CONTRIBUTIOlSrS FROM THE NATIONAL HERBARIUM. 



Leaves biternate or bipinnate. 

 Leaflets entire. 



Leaflets glabrous except along the costa 28. S. flaviflora. 



Leaflets pubescent on one or both surfaces. 

 Leaflets ovate-lanceolate or ovate, very acute. 



29. S. subtriplinervis. 

 Leaflets elliptic or elliptic-ovate, obtuse, the upper ones short- 

 cuspidate. 



Cells of the fruit glabrate 30. S. fuscopunctata. 



Cells of the fruit densely pubescent 31. S. sordida 



Leaflets serrate or dentate. 

 Leaves biternate. 



Plants subherbaceous ; fruit suborbicular 32. S. macrococca. 



Plants fruticose ; fruit much longer than broad. 

 Leaflets with few serrations ; branches canaliculate-sulcate, 



obtusely angulate 33. S. racemosa. 



Leaflets closely subduplicate-serrate ; branches striate-sul- 



cate, subterete ' 34. S. polystachya. 



Leaves pinnate or bipinnate. 



Leaflets glabrous 35. S. californica. 



Leaflets pubescent beneath. 



Fruit broadest toward the apex. 



Cells of the fruit longer than broad 36. S. incisa. 



Cells of the fruit broader than long 37. S. sphenocarpa. 



Fruit broadest at the base. 

 Mature fruit 10 to 12 mm. long; leaflets conspicuously 



crenate or lobate 38. S. cystocarpa. 



Mature fruit 20 nmi. long ; leaflets with only a few re- 

 mote teeth 39. S. paciflca. 



1. Serjania trifoliolata Radlk. Contr. U. S. Nat. Herb. 1: 317. 1895. 

 Sinaloa to Guerrero ; type from Manzanillo, Colima. 



Stems glabrous, 6-costate ; leaflets ovate-rhombic to suborbicular, 3 to 8 cm. 

 long, obtuse to acuminate, coarsely serrate-dentate, thin, glabrous ; sepals 

 glabrate ; petals 2.5 mm. long ; fruit about 1.5 cm. long, glabrous. 



2. Serjania cambessediana Schlecht. & Cham. Linnaea 5: 214. 1830. 

 Veracruz and Oaxaca ; type from Jalapa, Veracruz. 



Stems glabrate, obtusely 6-angulate; leaflets ovate-lanceolate, elliptic, ovate, 

 or rhombic, 0.5 to 4 cm. long, obtuse to acuminate, serrate-dentate, glabrous or 

 nearly so; outer sepals subglabrous, the inner tomentulose; petals 2.5 mm. 

 long; fruit 2.2 cm. long, glabrate. 



3. Serjania adiantoides Radlk. Field Mus. Bot. 1: 403. 1898. 

 Known only from the type locality, Buenavista Xl)ac, Yucatan. 



Stems subherbaceous, hirsute on the angles ; leaves subbipinnate, the pinnae 

 4 pairs. " Bui." 



4. Serjania heterocarpa Standi., sp. nov. 



Type from Monte Alban, Oaxaca {Pringle 5835; U. S. Nat. Herb. no. 316723). 



Stems pilosulous, obtusely 5-angulate, the woody portion with 3 obtusely 

 trigonous outer fascicles ; leaves trifoliolate, the leaflets ovate-elliptic or broadly 

 rhombic, 1.5 to 3 cm. long, acute or obtuse, duplicate-dentate, pilosulous on both 

 surfaces ; fruit about 12 mm. long and 17 mm. broad, densely puberulent, the 

 cells inflated, the wing 2.5 to 4 mm. wide. 



The fruit is very different from that of any of the Mexican species seen by 

 the writer, in its general appearance suggesting that of the genus Paullinia. 



