STANDLEY TREES AND SHRUBS OF MEXICO. 573 



11. MASCAGNIA Bertero ; Colla, Hort. Ripul. 86. 1824. 



Scandent, trailing, or suberect slirubs; leaves opposite, entire; calyx with 

 usually 8 glands ; petals entire, denticulate, or rarely lobate ; fruit of 3 samaras 

 with large wings. 



Styles pubescent ; petals yellow. 



Flowering peduncles 3 mm. long or longer; anthers ovoid 1. M.niacroptera. 



Flowering peduncles 1 nun. long or less ; anthers subglobose 2. M. mexicana. 



Styles glabrous ; petals not yellow. 

 Filaments very unequal. 



Leaves broadly ovate to lanceolate, usually acute 3. M. lilacina. 



Leaves obovate or broadly obovate, usually rounded at apex. 



4. M. vacciniifolia. 

 Filaments equal or nearly so. 



Flowers mostly axillary, never in terminal panicles. 



Leaves mostly oblong or ovate-oblong, 1.5 cm. long or shorter. 



5. M. cana. 

 Leaves broadly ovate to suborbieular, mostly 2 to 6 cm. long. 



6. M. seleriana. 

 Flowers in terminal panicles. 



Petals undulate; glands much shorter than the sepals; leaves glabrous or 



nearly so 7. M. gouania. 



Petals denticulate ; glands nearly as long as the sepals ; leaves sot't-pub- 

 escent on both sides 8. M. polybotrya. 



1. Mascagnia macroptera (Moc. «fc Sesse) Niedenzu, Mascagn. 27. 1908. 

 Ifiraea macroj)tcra Moc. & Sess§; DC. Prodr. 1: 586. 1824. 



Hiraea septentrionalis .Trss. Ann. Sci. Nat. II. 13: 259. 1840. 



Iliraea grevgii S. Wats. Proc. Amer. Acad. 17: 333. 1882. 



Hiraea mexicana Rose, Contr. U. S. Nat. Herb. 1: 312. 1895. 



Baja California and Sonora to Tamaulipas, Hidalgo, and Sinaloa. 



Scandent or sometimes erect shrub; leaves lanceolate to oval, 3 to 8 cm. long, 

 rounded to acute at apex, glabrate, short-petiolate ; petals 6.5 to 12 mm. long ; 

 samnras 4.5 to 5.5 cm. wide, the wings erose-denticulate or undulate. " Ga- 

 llinita " (Sonora, Baja California); " matanene " (Baja California, Sinaloa); 

 " bejuco prieto " (Sinaloa). 



Leaves sometimes used as poultices for bruises and sores. 



2. Mascagnia mexicana Niedenzu, Mascagn, 29. 1908. 

 Veracruz ; type collected near Orizaba. 



Leaves ovate or oval, 10 cm. long or less, pubescent beneath ; petals yellow, 

 10 to 12 mm. long ; samaras 3.5 to 4.5 cm. wide. 



3. Mascagnia lilacina (S. Wats.) Niedenzu in Engl. & Prantl, Pflanzenfam. 3 ': 



56. 1890. 



Hiraea lilacina S. Wats. Proc. Amer. Acad. 17: 333. 1882. 



Coahuila ; type from Caracol Mountains, south of Monclova. 



Scandent to a height of 4.5 meters ; leaves 2.5 to 4 cm. long, rounded or 

 cordate at base; petals blue or lilac, 8 to 10 mm. long; samaras 2 to 2.5 cm. 

 wide. 



4. Mascagnia vacciniifolia Niedenzu, ]Mascagn. 11. 1908. 



Mascafmia rupicola T. S. Braudeg. Univ. Calif. Publ. Bet. 6: 501. 1919. 

 Veracruz and perhaps elsewhere. 



Scandent on rocks to a height of 15 meters ; leaves 2 to 3 cm. long, obtuse 

 or acute at base; petals rose-colored, 5 to 6 mm. long; samaras 2.5 cm. wide. 



