STANDLEY TEEES AND SHKUBS OF MEXICO. 1135 



4. Fraxinus schiedeana Sclilecht. & Cham. Linnaea 6: 391. 1831. 

 "Veracruz ; type from Jalapa. 



Large shrub or small tree ; leaflets 5 to 9, oblong, lance-oblong, or elliptic, 

 sessile, narrowed to the obtuse apex, attenuate at base, glabrous, subcoriaceous, 

 lustrous, the mar^ns subrevolute ; samaras about 1.5 era. long, the wing longer 

 than the body, emarginate. 



5. Fraxinus attenuata Jones, Contr. West. Bot. 12: 59. 1908. 

 Fraxinus jonesii Lingelsh. in Engl. Pflanzenreich IV. 243^: 35. 1920. 

 Type from Valley of Palms, Baja California ; reported from Chihuahua. 



A tree ; rachis very narrowly winged ; leaflets usually 5, oval, sessile or nearly 

 so, 0.5 to 2 cm. long (very immature), 0.5 to 1 cm wide, entire or obscurely 

 crenulate, whitish-pilose on both surfaces, especially beneath. 



6. Fraxinus dipetala Hook. & Arn. Bot. Beechey Voy. 362. pi. 87. 1841. 

 Fraxinus dipetala trifoUolata Torr. U. S. & Mex. Bound. Bot. 167. 1859. 

 Baja California. California. 



Shrub or small ti'ee; leaves simple, or the leaflets 3 to 9, long-petiolulate, 

 oblong to oval or rounded, obtuse or acute, entire or nearly so, thin, glabrous ; 

 flowers white, with 2 large petals, the panicles about as long as the leaves; 

 samaras 2 to 3 cm. long. 



In the typical form there are 5 to 9 leaflets. The Mexican material is 

 F. dipetala trifoUolata, characterized by having simple or trifoliolate leaves. 

 It was reported from Baja California by Goldman * as F. attenuata Jones. 



7. Fraxinus potosina T. S. Brandeg. Univ. Calif. Publ. Bot. 4: 275. 1912. 

 Type from Minas de San Rafael, San Luis Potosf. 



Plants glabrous ; leaves simple, suborbicular, 1 to 2.5 cm. long, entire or 

 serrate, coriaceous ; samaras 4 to 5 mm. long, the wing rounded at apex, much 

 shorter than the compressed body. 



8. Fraxinus nummularis Jcnes, Contr. West. Bot. 12: 59. 1908. 

 Coahuila ; type from Sierra Mojada. 



Shrub with stiff branchlets; leaves mostly simple but sometimes trifoliolate, 

 the simple leaves oblanceolate to oval, 1 to 2.5 cm. long, obtuse, glabrous, 

 subcoriaceous; flowers apetalous; wing of the samara much longer than the 

 body. 



It seems probable that this is a form of F. greggii, bearing the same relation 

 to the latter that F. dipetala trifoUolata does to F. dipetala. In the type 

 collection of F. nummularis all the leaves are simple and oval. A specimen 

 from Sierra de Parras (Purpus 5064) shows leaves of the same kind, but some 

 of the leaves are trifoliolate, and some of the simple ones are exactly like the 

 leaflets of F. greggii. 



9. Fraxinus cuspidata Torr. U. S. & Mex. Bound. Bot. 166. 1859. 

 Fraxinus cuspidata serrata Rehder, Proc. Amer. Acad. 53: 202. 1917. 

 Chihuahua and Coahuila. AVestern Texas to Arizona; type from Texas. 

 Slender shrub or tree, sometimes 8 meters high, with a trunk 20 cm. in 



diameter; leaflets 3 to 9, long-petiolulate, linear-lanceolate to ovate, 2 to 7 cm. 

 long, long-attenuate, thin, glabrous ; flowers white, sweet-scented, in loose pani- 

 cles; petals 4, about 1.5 cm. long; samaras about 2 cm. long, the wing equaling 

 or shorter than the flat body. " Fresno." 



'Contr. U. S. Nat. Herb. 16: 360. 1916. 



