Part 2, 1910] MALPIGHIACEAE 121 



sile ; sepals ovate, about 2 mm. long, the glands about one half the length of the sepal- 

 body ; petals purplish, 5-6 mm. long, with undulate or erose blades; samaras suborbicular, 

 15-1S mm. wide, the dorsal wing as large as the lateral ones or larger. 



Type locality : Cadena, Durango. 

 Distribution : Northern Mexico. 



11. Mascagnia Seleriana Loesener, Bull. Herb. Boiss. 2 : 543. 1894. 



Nil, n-a parvi flora Rose, Contr. U. S. Nat. Herb. 5: 139. 1S97. 

 Mascagnia Pringlei Niedzu. Gen. Mase. 9. 1908. 



Leaf-blades ovate to oblong-ovate, 2-5 cm. long, acute or abruptly short-acuminate, 

 tomentulose above, lanate beneath, rounded or subcordate at the base, bearing a small 

 stalked gland on either side near the base, short-petioled ; sepals ovate, 2.5-3 mm. long, 

 copiously pubescent and ciliate, the glands fully one half the length of the sepal-body ; 

 petals violet, 5-8 mm. long, with denticulate blades ; samaras suborbicular, sometimes 

 slightly cordate at the base, 13-18 mm. wide, the dorsal wing a mere ridge or crest-like, 

 single or double. 



Type locality : Mexico. 

 Distribution : Southern Mexico. 



12. Mascagnia lilacina (S. Wats.) Niedzu. in E. & P. Nat. 



Pfl. 3 4 : 56. 1890. 

 Hiraea lilacina S. Wats. Proc. Am. Acad. 17 : 333. 1882. 



Leaf-blades ovate to lanceolate, mostly 2.5-4 cm. long, acute or mucronate, ultimately 

 glabrous above, sparingly pubescent beneath, paler-green beneath than above, rounded or 

 cordate at the base, slender-petioled ; sepals oblong to oblong-ovate, about 3 mm. long, 

 glabrous, the glands about one half the length of the sepal-body ; petals blue or lilac, 8-10 

 mm. long, with erose-undulate blades; samaras suborbicular or reniform, 2-2.5 cm. wide, 

 undulate, the dorsal wing prominent. 



Type locality: Caracol Mountains, south of Monclova, Coahuila. 

 Distribution : Coahuila. 



13. Mascagnia vacciniifolia Niedzu. Gen. Masc. 11. 1908. 



Mascagnia vacciniifolia glabrata Niedzu. Gen. Masc. 11. 1908. 

 Mascagnia vacciniifolia hispiditla Niedzu. Gen. Mase. 11. 1908. 



Leaf-blades obovate, 3 cm. long or less, rounded or slightly emarginate and apiculate 

 at the apex, revolute, sericeous when young, glabrous or nearly so in age, obtuse or acute 

 at the base, short-petioled ; sepals ovate-lanceolate, about 3 mm. long, the glands over one 

 half the length of the sepal-body; petals rose-colored, 5-6 mm. long, with suborbicular to 

 orbicular-hastate or reniform blades ; samaras about 2.5 cm. wide, the dorsal wing obsolete. 



Type locality - : Central America. 

 Distribution : Mexico and Central America. 



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



Trees, or erect, trailing, or climbing shrubs. Leaves opposite, with slender stipules 

 borne on the petioles ; blades mostly leathery, entire, usually somewhat pubescent, often 

 copiously so, short-petioled, at least relatively so. Calyx glandlessor with 8 glands ; sepals 

 5, broad, varying from oblong to deltoid, persistent. Corolla yellow or rarely white ; petals 

 5, the blades oblong to suborbicular or reniform, undulate, denticulate, or fimbriate. Sta- 

 mens 10, all anther-bearing ; filaments subulate or nearly filiform ; anthers subglobose, 

 oblong, or ovoid. Ovary 3-lobed. Styles 3, distinct, unequal or nearly equal. Samaras 

 3 together, with distinct lateral wings and small dorsal crests. Embryo with very unequal 

 cotyledons, the larger one thick. 



Type species, Hiraea reclinata Jacq . 



Fruits with membranous lateral wings and toothed dorsal crests. 

 Anthers subglobose ; petals membranous. 



Petal-blades undulate. 1. H.borealis. 



