STANDLEY — TREES AND SHRUBS OF MEXICO. 711 



Leaves without glands. 

 Cells of the fruit dehiscent ; leaves usually alternate. 



Petals greenish or yellowish 8. COLTJBRINA. 



Petals white, pink, or blue 9. CEANOTHUS. 



Cells of the fruit indehiscent ; leaves opposite or subopposite. 



Flowers sessile, in large panicles 10. SAGEBETIA. 



Flowers pedicellate, solitary or umbellate in the leaf axils. 



11. RHAMNUS. 



1. GOUANIA Jacq. Stirp, Amer. 263. 1763. 

 Shrubs, usually scandent, with tendrils in the inflorescence ; leaves alternate, 

 petiolate, toothed, pinnate-nerved or triplinerved ; flowers small, polygamous, 

 in long, terminal and axillary racemes or spikes ; calyx 5-lobate, adherent 

 to the ovary ; petals 5 ; stamens 5 ; fruit coriaceous, inferior, 3-winged, the 

 3 cocci indehiscent, separating from the axis. 



Stipules persistent, reniform, large, leaflike; leaves glaucescent beneath, glab- 

 rous 1. G. stipularis. 



Stipules deciduous, linear or subulate; leaves not glaucescent beneath, hairy, 

 at least on the nerves. 



Leaves glabrous beneath except along the nerves 2. G. lupuloides. 



Leaves densely pubescent beneath, between as well as upon the nerves. 

 Mature fruit narrowly winged, the wings about 1 mm. wide. 



3. G. mexicana. 

 Mature fruit broadly winged, the wings 5 mm. wide or larger. 



Axis of the fruit about 3 mm. long 4. G. polygama. 



Axis of the fruit 5 to 6 mm. long 5. G. conzattii. 



1. Gouania stipularis DC. Prodr. 2: 39. 1825. 

 Phylica scandens Sesse & Moc. PI. Nov. Hisp. 39. 1887. 



Oouania mexicana Sesse & Moc. Fl. Mex. 259. 1896. Not O. mexicana Rose, 

 1895. 



Guerrero ; reported from Yucatan and Oaxaca. 



Branches glabrous, glaucescent ; leaves slender-petiolate, oblong-elliptic or 

 elliptic-ovate, 9 to 13 cm, long, subcordate at base, obtuse-acuminate at apex, 

 thin, nearly entire ; flowers densely pilosulous. 



Sesse and Mociiio give the locality of Phylica scandens as Apatzingan, Guer- 

 rero, and that is doubtless the type locality also of Gouania stipularis. 



2. Gouania lupuloides (L.) Urban, Symb. Antill. 4: 378. 1910. 

 Banisteria lupuloides L. Sp. PI. 427. 1753. 



Rhamnus domingensis Jacq. Enum. PI. Carib. 17. 1760. 



Oouania domingensis L. Sp. PI. ed. 2. 1663. 1763. 



Chihuahua to Tamaulipas, Veracruz, Yucatan, Chiapas, and Sinaloa. South- 

 ern Florida, West Indies, and Central America. 



Stems 3 to 10 meters long, glabrous or nearly so ; leaves short-petiolate. 

 lance-oblong to broadly ovate-elliptic, 4.5 to 11 cm. long, acute or acuminate, 

 rounded or subcordate at base, remotely and coarsely serrate or subentire; 

 racemes 10 to 40 cm. long ; flowers white or greenish white, densely pubescent ; 

 fruit 7 to 12 cm. broad, glabrous or nearly so. " Xomak " (Yucatan, Maya) ; 

 " bejuco lefiatero," " jaboncillo bejuco " (Cuba); " rabo de mono" (Nica- 

 ragua) ; " bejuco de indio " (Santo Domingo). 



In the British West Indies the plant is known as " chewstick," pieces of the 

 stem being sometimes chewed to heal and harden the gums and to cleanse the 

 teeth. A decoction of the plant also is employed to harden the gums, and the 



