710 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaflets 5 to 13, opposite, ovate-oblong to elliptic-lanceolate, 10 cm. long or 

 less, petiolulate, acuminate, serrate, pubescent at first, especially beneath ; 

 flowers pedicellate ; petals 1.3 to 1.7 mm. long. " Palo bianco." 



2. Meliosma dentata (Liebm.) Urban, Bericht. Deutsch. Bot. Ges. 13: 212. 1895. 

 Lorenzanea dentata Liebm. Nat. For. Kjobenhavn Vid. Medd. 1850: 70. 1851. 

 Jalisco to Oaxaca, Mexico, and Veracruz ; type from Pico de Orizaba. 



Tree, 7.5 to 12 meters high ; leaves obovate-oblong to oblong-lanceolate, 2.5 to 

 6 cm. wide, acuminate, remotely spinulose-serrate, pubescent beneath at first 

 soon glabrate ; petals 3 mm. long ; fruit 9 to 10 mm. long. 



3. Meliosma oaxacana Standi., sp. nov. 



Type from Sierra San Felipe, Oaxaca, altitude 2,400 meters {Pringle 5720; 

 U. S. Nat. Herb. no. 316725). 



Small tree, the branchlets densely hirsutulous; petioles 5 to 8 mm. long; 

 leaf blades narrowly lance-oblong, 4.5 to 10.5 cm. long, 1.3 to 2.5 cm. wide, 

 acuminate, obtuse or acute at base, entire, coriaceous, puberulent above along 

 the nerves, pale beneath, fulvous-hirsutulous along the prominent costa and 

 nerves ; panicles axillary and terminal, long-pedunculate, about equaling the 

 leaves, brownish-hirtellous ; pedicels stout, 1 to 2 mm. long; sepals 5, suborbi- 

 cular, ciliate but otherwise glabrous. 



4. Meliosma grandifolia (Liebm.) Urban, Bericht. Deutsch. Bot. Ges. 13: 211. 



1895. 

 Lorenzanea grandifoda Liebm. Nat. For. Kjobenhavn Vid. Medd. 1850: 73. 



1851. 

 Known only from the type locality, near Cuesta de Teotalcingo, Distrito de 

 Chinantla, Oaxaca, altitude 1,300 to 1,700 meters. 



Leaves obovate-oblong, 8 to 11 cm. wide, short-acuminate, entire, pubescent, 

 especially beneath ; panicles axillary ; fruit 21 to 24 mm. long, 18 to 22 mm. 

 thick. 



91. EHAMNACEAE. Buckthorn Family 



Trees or shrubs, sometimes scandent, often armed with spines ; leaves 

 simple, usually stipulate, entire or toothed ; flowers perfect or polygamo-dioe- 

 cious, small, commonly greenish, usually in axillary cymes, calyx 4 or 5-lobate ; 

 petals 4 or 5 or none, cucullate or involute, sessile or clawed ; stamens 4 or 5, 

 opposite the petals ; fruit 1 to 4-celled, capsular or drupaceous. 



Plants with tendrils ; ovary inferior ; fruit longitudinally winged. 



1. GOUANIA. 

 Plants without tendrils ; ovary superior ; fruit not winged. 

 Fruit drupaceous, with a single 1 to 4-celled stone. 



Leaves triplinerved 2. ZIZYPHUS. 



Leaves pinnate-nerved, or at least not triplinerved. 

 Leaves alternate or fasciculate. 



Margins of leaves strongly revolute 3. MICRORHAMNUS. 



Margins of leaves not revolute 4. CONDALIA. 



Leaves subopposite 5. KARWINSKIA. 



Fruit capsular, or drupaceous but containing 2 to 4 distinct or only slightly 

 coherent stones. 

 Leaves minute and soon deciduous ; branchlets spinose, opposite. 



6. ADOLPHIA. 

 Leaves well developed, persistent; branchlets not spinose or, if so, alter- 

 nate. 

 Leaves each with 2 glands on the lower side near the base of the blade. 



7. CORMONEMA. 



