126 NORTH AMERICAN FLORA [VOLUME 25 



oblong or oval, 3.5-4.5 mm. long, the glands about one half as long as the sepal-body; 

 petals yellow, the larger ones 9-11 mm. long, the blades suborbicular, denticulate; free 

 portions of the filaments subulate, longer than the tube ; samaras 2-2.5 cm. long, the body 

 villous, with a median wing-like keel, the w T ings glabrous or nearly so, the lower wings 

 spatulate to obovate-spatulate, the upper wings somewhat smaller than the lower. 



Type locality : Taliseo [Jalisco] . 

 Distribution : Middle Mexico. 



4. Tetrapteris Nelsoni Rose, Contr. U. S. Nat. Herb. 5 : 143. 1897. 

 Leaf-blades ovate to orbicular-ovate, 1-3.5 cm. long, acute or short-acuminate, sparingly 



pubescent beneath or glabrous in age, somewhat shining above, dull beneath, cordate at the 

 base, sessile or very short-petioled, the petiolar glands obsolete; inflorescence-branches 

 glabrous; sepals ovate, 3.5-4 mm. long, the glands nearly one half the length of the sepal- 

 body; petals not seen ; samaras about 2 cm. long, the body hirsute, with a median wing- 

 like keel, the wings glabrous, the lower ones oblong-cuneate, the upper ones shorter and 

 narrower than the lower ones. 



Type locality : Between Nopala and Mixistepec, Oaxaca. 

 Distribution : Known only from the type locality. 



5. Tetrapteris emarginata Bartlett, Proc. Am. Acad. 43 : 53. 1907. 



Leaf-blades oval to suborbicular, rather membranous, 1-4 cm. long, abruptly pointed 

 or emarginate at the apex, light-green, but slightly paler beneath than above, more or less 

 silky-pubescent when young, glabrous or nearly so in age, obscurely reticulate, rounded or 

 subcordate at the base, short-petioled ; inflorescence-branches glabrous, at least at ma- 

 turitv ; sepals ovate to oblong-ovate, 2-2.5 mm. long, the glands over one half the length 

 of the sepal-body ; petals not seen ; samaras 2-2.5 cm. long, the bodies sparingly pubescent, 

 with a median wing-like keel, the lower wings linear to linear-cuneate, the upper wings 

 linear or nearly so, about one half as long as the lower ones. 



Type locality : Gualan, Guatemala. 

 Distribution : Known only from the type locality. 



6. Tetrapteris glabrifolia (Griseb.) Small. 



Tetrapteris calophylla Seem. Bot. Voy. Herald 92. 1853. Not T. calophylla A. Juss. 1840. 

 Tetrapteris calophylla glabrifolia Griseb. Bonplandia 6 : 3. 1858. 



Leaf-blades ovate, oval, or oblong-ovate, or somewhat obovate, 6-16 cm. long, acute or 

 short-acuminate, glabrous or with scattered hairs beneath when young, bright-green and 

 shining above, slightly paler and dull beneath, rounded or subcordate at the base, rather 

 short-petioled, the petiolar glands obsolete ; inflorescence-branches copiously fine-pubescent; 

 sepals ovate or oval, 3.5-4 mm. long, the glands nearly as long as the sepal-body ; petals 

 yellow, the larger ones 8-10 mm. long, the blades suborbicular, denticulate ; free portions 

 of the filaments very short ; samaras 3-5 cm. long, copiously fine-pubescent, the body with 

 a median wing-like keel, the upper wings oblong to spatulate, the lower wings much shorter 

 than the upper. 



Type locality : Panama. 

 Distribution : Costa Rica and Panama. 



7. Tetrapteris acapulcensis H.B.K. Nov. Gen. & Sp. 5 : 168. 1822. 

 Leaf-blades oblong, oval, or oblong-ovate, 3-6 cm. long, obtuse or acutish, minutely 

 pubescent on and about the veins beneath, or glabrous in age, shining on both sides or 

 rather dull beneath, rounded or subcordate at the base, very short-petioled, the petiolar 

 glands obsolete ; inflorescence-branches densely pubescent; sepals ovate, 3-3.5 mm. long, the 

 glands nearly as long as the sepal-body ; petals yellow, the larger ones 7-8 mm. long, 

 the blades broadly oblong to ovate-oblong, crenulate or undulate-crenulate ; free portions 

 of the filaments about as long as the tube ; samaras 1.5-2 cm. long, the body finely pubes- 



