238 NORTH AMERICAN FLORA [Volume 25 



12. PICRODENDRON Planch. Lond. Jour. Bot. 5 : 579. 1846. 



Trees or shrubs, usually with shaggy bark. Leaves alternate ; blades long-petioled, 

 3-foliolate, the leaflets leathery, rather broad, petioluled. Flowers dioecious, the pistillate 

 solitary in the leaf-axils, pedicelled. Calyx inconspicuous ; lobes 5, narrow, deciduous. 

 Petals wanting. Stamensnot seen. Ovary 2-celled, not lobed, ovoid, sessile ; style columnar ; 

 stigma subulate, longer than the style. Drupes short, thick, spreading or nodding. Seed 

 nearly terete. 



Type species, Rhus arborea Macfad. 



Drupe shorter than the pedicel, mostly globose. 1. P. baccalum. 



Drupe longer than the pedicel, ovoid or oval. 2. P. macrocarpum. 



1. Picrodendron baccatum (L,.) Krug & Urban ; Urban, Bot. 



Jahrb. 15 : 308. 1893. 



Juglans baccala L. Syst. ed. 10. 1272. 1759. 



Rhus arborea Macfad. Fl. Jam. 1 : 225. 1837. Not R. arborea DC. 1825. 

 Picrodendon arboreum Planch. Lond. Jour. Bot. 5: 580. 1846. 

 Picrodendron Juglans Griseb. Fl. Brit. W. Ind. 177. 1859. 



A tree. Leaves mostly 1-2 dm. long, the petiole pubescent, the leaflets 4-11 cm. long, 

 the blades elliptic, oblong or oval, varying to ovate or obovate, obtuse, minutely pubescent 

 or glabrous in age, rather obscurely fine-reticulate ; calyx greenish, the lobes linear- 

 lanceolate, 5-7 mm. long; drupes mostly globose, 1.5-2 cm. long, orange, shorter than 

 the pedicels. 



Type locality : Jamaica. 



Distribution : Jamaica. 



Illustration : Sloane, Hist. Jam. pi. 157,/. 1. 



2. Picrodendron macrocarpum (A. Rich.) Britton, Bull. 

 N. Y. Bot. Gard. 4: 139. 1906. 



Schmidelia macrocarpa A. Rich. Ess. Fl. Cuba 283. 1842. 



Picrodendron baccalum bahamense Krug & Urban ; Urban, Bot. Jahrb. 15: 308. 1893. 



A tree, or sometimes a shrub. Leaves mostly less than 1.5 dm. long, the petiole 

 minutely pubescent, the leaflets 1.5-9 cm. long, the blades oblong, oval, obovate, or cuneate, 

 usually rounded or notched at the apex, finely pubescent or glabrous in age, rather promi- 

 nently fine-reticulate; calyx yellowish-green, the lobes narrowly linear-lanceolate, 2.5-3.5 

 mm. long ; drupes oval or ovoid, 2-2.5 cm. long, yellow, longer than the pedicels. 



Type locality : Vuelta de Abajo, Cuba. 

 Distribution : Cuba ; Bahamas. 

 Illustration : Sagra, Hist. Cuba 10 : pi. 30. 



13. ALVARADOA Liebm. Vidensk. Meddel. 1853 : 100. 1854. 



Shrubs or small trees with slender branches. Leaves alternate, mostly near the ends 

 of the branches, unequally pinnate ; leaflets usually numerous, the blades thin or leathery, 

 much larger and relatively narrower on the upper part of the rachis, short-petioluled. 

 Flowers dioecious, in spreading or drooping inconspicuously bracted racemes. Sepals 5, 

 short and broad, slightly united at the base. Petals wanting. Stamens 5, exserted; fila- 

 ments filiform, pubescent ; anthers short. Ovary 2- or 3-celled, sessile ; styles 2 or 3, more 

 or less recurved ; stigmas minute. Ovules 2 in each ovary-cavity. Samara short or elongate, 

 2- or 3-winged. 



Type species, Alvaradoa amorphoides Liebm. 



Samaras pubescent and ciliate, not shining. 



Samaras lanceolate to oblong-lanceolate ; seed-cavity nearly as wide as the 



samara. 1. A. amorphoides. 



Samara oblong-obovate : seed-cavity very narrow. 2. A. haitiensis. 



Samaras glabrous and eciliate, shining. 



Samaras oblong, obtuse ; larger leaflets not with parallel sides. 3. A . arborescens. 



Samaras broadly ovate to orbicular-ovate, acute larger leaflets with paral- 

 lel sides. 4. A. jamaicensis. 



