122 NORTH AMERICAN FLORA [VOLUME 25 



Petal-blades denticulate or fimbriate. 



Leaf-blades permanently velvety beneath. 2. H.velutina. 



Leaf -blades nearly glabrous beneath, except the silky midrib. 3. H . obovata. 

 Anthers oblong or obovoid ; petals leathery. 



Inflorescence with elongate branches; petal-blades oblong to ovate- 

 oblong. 4. H. dipholiphyUa. 

 Inflorescence umbel-like ; petal-blades suborbicular to reniform. 5. H.fagifolia. 

 Fruits with leathery lateral wings and entire dorsal crests. 6. H. faginea. 



1. Hiraea borealis Niedzu. Gen. Hiraea 5. 1906. 



Hiraea borealis cgla.ndu.losa Niedzu. Gen. Hiraea 6. 1906. 

 Hiraea borealis glandulifera Niedzu. Gen. Hiraea 6. 1906. 



Leaf-blades oblong-obovate, varying to oval or narrowly oblong, 4-11 cm. long, rounded 

 or notched at the apex, nearly smooth and slightly shining above, dull and glabrous or 

 nearly so beneath except the silky midrib, truncate or narrowly subcordate at the base, the 

 stout petioles 5-7 mm. long; flower-clusters short-peduncled, the pedicels usually longer 

 than the peduncles; sepals ovate, 3-3.5 mm. long, the glands scarcely one half the length 

 of the sepal-body, or wanting ; petals yellow, the larger ones 8-9 mm. long, the blades sub- 

 orbicular, denticulate; mature fruit not seen. 



Type locality : Ruatan Island, near Honduras. 

 Distribution : Ruatan and Cozumel Islands, Central America. 



2. Hiraea velutina Niedzu. Gen. Hiraea 6. 1906. 

 Leaf-blades obovate, some of them becoming 10 cm. long, rounded at the apex or rarely 



apiculate, somewhat shining and glabrous or permanently puberulent above, permanently 

 velvety beneath, the stout petioles 5-6 mm. long; flower-clusters short-peduncled, the 

 pedicels longer than the peduncles; sepals ovate, about 2.5 mm. long, glandless ; petals 

 yellow, the larger ones about 9 mm. long, the blades suborbicular, denticulate ; fruit not 

 seen. 



Type locality: Pinotepa, Mexico. 

 Distribution : Southern Mexico to Colombia. 



3. Hiraea obovata Niedzu. Gen. Hiraea 7. 1906. 



Hiraea obovata latifolia Niedzu. Gen. Hiraea 7. 1906. 

 Hiraea obovata angusli/olia Niedzu. Gen. Hiraea 7. 1906. 



Leaf-blades obovate to oblanceolate, more or less constricted near the base, thus some- 

 what pandurate, 9-18 cm. long, obtuse, sometimes rounded or acute or short-acuminate at 

 the apex, glabrous in age, except the densely pubescent midrib, or sparingly pubescent 

 beneath, truncate or slightly cordate at the base, the stout petioles 2-5 mm. long; flower- 

 clusters short-peduncled, the slender pedicels much longer than the peduncle ; sepals ovate, 

 3-4 mm. long, the glands often about one half the length of the sepal-body, or wanting; 

 petals yellow, the larger ones 8-11 mm. long, the blades suborbicular, denticulate or fim- 

 briate-denticulate ; samaras 2.5-3 cm. wide, the wings reniform, vein}', finely pubescent. 



Type locality : Costa Rica. 

 Distribution : Central America. 



4. Hiraea dipholiphyUa Small, sp. nov. 

 Leaf-blades narrowly oblong to oblong-lanceolate, or sometimes broadened upward, 

 5-8 cm. long, acutish or abruptly pointed at the apex, sparingly pubescent on both sides, 

 shining and very finely reticulate-veined above, pale, dull and more prominently reticulate- 

 veined beneath, acute at the base, the relatively slender petioles 5-14 mm. long; flower- 

 clusters long-peduncled, the branches elongate, the relatively stout pedicels shorter than 

 the peduncle or its branches ; sepals oblong to ovate-oblong, 2.5-3 mm. long, obtuse, 

 glandless ; petals yellow, the larger ones 6-9 mm. long, the blades oblong to ovate-oblong, 

 undulate; samaras 2.5-3.5 cm. wide, the wings flabellate or cuneate-flabellate, finely pubes- 

 cent, not very veiny. 



Type collected near Cuernavaca, Mexico, March 19, 1899, C. G. Pringle 7730 (herb. Harvard 

 Univ.). 



Distribution : Morelos. 



