Part 2, 1910] MALPIGHLACEAE 135 



nently veined beneath, obtuse or rounded at the base, rather short-petioled ; inflorescence 

 leafy-bracted ; sepals ovate, 3.5-4.5 mm. long, the glands fully one half the length of the 

 sepal-body ; larger petals 5.5-6.5 mm. long ; samaras 2.5-3 cm. long, the wing silky, much 

 dilated toward the apex, the body with a single crown. 



Type locality : Mexico. 

 Distribution : Mexico. 



3. Banisteria arborescens (Brand.) Small. 



Heteropteris arborescens Brand. Zoe 5 : 203. 1905. 



Leaf-blades ovate-lanceolate or oblong-lanceolate, 4-8 cm. long, acute or slightly 

 acuminate, bright-green above, pale beneath, permanently sparingly pubescent on the 

 veins on both sides, rounded at the base, short-petioled ; inflorescence pyramidal ; sepals 

 ovate, 2-2.5 mm. long, the glands fully one half the length of the sepal-body ; petals not 

 seen ; samaras 2.5-3 cm. long, the wing thin, finely pubescent, broad and somewhat dilated 

 near the apex, auricled at the base on the ventral side, the body crownless. 



Type locality : Cerro Colorado, Sinaloa. 

 Distribution : Known only from the t\-pe locality. 



4. Banisteria Gayana (A. Juss.) C. B. Robinson. 



Heteropleris Gayana A. Juss. Ann. Sci. Nat. II. 13: 274. 1840. 



Leaf-blades ovate, oblong, or oval, usually 2.5-7 cm. long, obtuse or mucronate at the 

 apex, sparingly pubescent when young, glabrous in age, finely veined beneath, but not 

 very prominently so, obtuse or rounded or sometimes acutish at the base, rather long-petioled ; 

 inflorescence pyramidal during anthesis ; sepals ovate to oblong-ovate, 2-2.5 mm. long, the 

 glands fully one half the length of the sepal-body ; petals not seen ; samaras 3-4 cm. long, 

 the wing finely pubescent, slightly dilated toward the apex, auricled at the base on the 

 ventral side, the body with a double or triple crown. 



Type locality : Mexico. 

 Distribution : Mexico. 



5. Banisteria Palmeri (Rose) C. B. Robinson. 



Heteropleris Porlillana Rose, Contr. U. S. Nat. Herb. 1 : 95. 1891. Not H. Portillana S. Wats. 

 Heteropleris Palmeri Rose, Contr. U. S. Nat. Herb. 1 : 311. 1895. 



Leaf-blades ovate to lanceolate, mostly 3-7 cm. long, usually slightly acuminate at the 

 apex, glabrous, at least at maturity, bright-green above, pale beneath and finely veined, 

 abruptly narrowed or rounded at the base, rather short-petioled ; inflorescence pyramidal ; 

 sepals ovate to oblong-ovate, 2.5-3 mm. long, the glands fully one half the length of the 

 sepal-body ; larger petals 5-6 mm. long ; samaras 2-2.5 cm. long, the wing thin, finely 

 pubescent, relatively broad, dilated toward the apex, auricled at the base on the ventral 

 side, the body with a double crown. 



Type locality : Alamos, Sonora. 

 Distribution : Northern Mexico. 

 Illustration : Contr. U. S. Nat. Herb. 1 : /. 2, a, c. 



6. Banisteria Portillana (S. Wats.) C. B. Robinson. 



Heteropieris Porlillana S. Wats. Proc. Am. Acad. 22 : 402. 1887. 



Leaf-blades ovate to elliptic, mostly 6-11 cm. long, acute or slightly acuminate at the 

 apex, glabrous, at least in age, glaucescent, bright-green above, paler beneath and promi- 

 nentlv veined, rounded or obtuse at the base, short-petioled ; inflorescence pyramidal ; 

 sepals ovate, 2.5-3 mm. long, the glands about one half the length of the sepal-body ; 

 larger petals 7-8 mm. long ; samaras 3-4 cm. long, the wing finely pubescent, often spar- 

 ingly so, dilated at the apex, auricled at the base on the ventral side, the body with a single, 

 often unequally developed, crown. 



Type locality : Jalisco. 



Distribution : Middle Mexico. 



Illustration : Contr. U. S. Nat. Herb. 1 : /. 2, b. 



