572 CONTRIBUTIONS FEOM THE NATIONAL HERBAIIIUM. 



Glands much shorter than the sepals, usually about half as long. 



Leaves conspicuously petiolate, rounded to acute at base 1. T. mexicana. 



Leaves mostly subsessile, cordate at base 2. T. nelsoni. 



Glands nearly or quite as long as the sepals. 



Lower wings of the samara much smaller than the upper ones. 



3. T. acapulcensis. 



Lower wings almost as large as the upper ones 4. T. schiedeana, 



1. Tetrapteris mexicana Hook. & Arn. Bot. Beechey Voy. 281. 1836. 

 Siualoa to Guerrero and Morelos; type from Jalisco. 



Shrub, scandent to a height of 6 to 8 meters ; leaves ovate or elliptic, 4 to 10 

 cm. long, acute or short-acuminate, glabrate ; petals 9 to 11 mm. long. 



2. Tetrapteris nelsoni Rose, Contr. U. S. Nat. Herb. 5: 143. 1897. 



Known only from tlie type locally, between Nopala and Jllxistepec, Oaxaca, 

 Leaves ovate or rounded-ovate, 1 to 3.5 cm. long, acute, glabrate. 



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

 Type from Acapulco, Guerrero. Central America and Colombia. 



Leaves oblong, ovate, or oval, 3 to 6 cm. long, obtuse or acutish ; petals 7 to 

 8 mm. long. 



4. Tetrapteris schiedeana Schlecht. & Cham. Linnaea 5: 218. 1830. 

 Hetcropteris yucatanensis Millsp. Field Mus. Bot. 1: 369. 1898. 



Tepic to Veracruz, Yucatan, and Chiapas ; type from Jalapa, Veracruz. Cen- 

 tral America. 



Scandent to a height of 6 meters or more ; leaves lanceolate to elliptic or 

 ovate, 3 to 9 cm. long, acute or acuminate ; petals 5 to 8 mm. long. 



DOUBTFUL SPECIES. 



Tetraptekis cotoneaster (H. B. K.) Juss. Ann. Sci. Nat. II. 13: 264. 1840, 

 Galphimia mollis H. B. K. Nov. Gen. & Sp. 5: 173. 1822. Type from Tepeco- 

 acuilco, Guerrero. 



10. HIRAEA Jacq. Enum. PI. Carib. 4. 1760. 



Erect or scandent shrubs or small trees ; leaves opposite, entire, tliick. short- 

 petiolate ; stipules very small, borne on the petioles ; petals usually yellow, 

 undulate or dentate ; fruit of 3 samaras, with large wings. 



Anthex's oblong; leaves acute at base 1. H. dipholiphylla. 



Anthers subglobose ; leaves truncate or subcordate at base. 



Petals mei'ely undulate; leaves nearly glabrous beneath 2. H. borealis. 



Petals denticulate ; leaves usually copiously pubescent beneath. 3. H. velutina, 



1. Hiraea dipholiphylla Small, N. Amer. Fl. 25: 122. 1910. 

 Morelos and Oaxaca ; type from Cuernavaca, Morelos. 



Leaves oblong to elliptic, 5 to 10 cm. long, acute or acuminate, bright green, 

 sericeous when young but soon glabrate ; petals yellow, 6 to 9 mm. long ; 

 samaras 2.5 to 3.5 cm. wide. 



2. Hiraea borealis Niedenzu, Hiraea 5. 1906. 



Cozumel Island, Yucatan. Type from RuatSn Island. Honduras. 

 Leaves oblong-obovate. oval, or oblong, 4 to 11 cm. long, rounded at apex; 

 petals yellow, 8 to 9 mm. long. 



3. Hiraea velutina Niedenzu, Hiraea 6. 1906. 



Sinaloa to Veracruz and Oaxaca; typo from Pinotepa, Oaxaca. Southward 

 to Colombia. 



Leaves mostly obovate, 5 to 11.5 cm. long, rounded or short-pointed at apex, 

 coriaceous, sometimes glabrate in age; petals yellow, about 9 mm. long. 



