100 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Known species 5, as follows: 
Piratinera guianensis Aubl. Pl. Guian. 2: 888. pl. 340. 1775. French Guiana. 
Piratinera discolor (Schott) Pittier. 
Brosimum discolor Schott in Mart. Fl. Bras, 4': 110. pl. 33. 1853, excl. syn. 
Eastern Brazil. 
Piratinera rubescens (Taub.) Pittier. 
Brosimum rubescens Taub. Bot. Jahrb. Engler 12: Beibl. 27: 9. 1891. Brazil. 
Piratinera acutifolia (Huber) Pittier. 
Brosimum acutifolium Huber, Bol. Mus. Goeldi 6: 66. 1910. Amazonia. 
Piratinera panamensis Pittier (below). Panama. 
A NEW SPECIES OF PIRATINERA. 
Piratinera panamensis Pittier, sp. nov. PLATE 7. 
A middle-sized or large tree, up to 25 meters high and 60 ecm. in trunk 
diameter. Bark grayish, smooth, laticiferous. Crown irregular, depressed. 
Leaves distichous, chartaceous, rather small, petiolate; petioles 5 to 7 mm. 
long, slender, canaliculate, minutely puberulous; blades ovate-oblong, inequilat- 
eral, rounded or subacute at the base, abruptly and shortly obtuse-acuminate 
at the apex, 4 to 10 cm. long, 2.5 to 3.5 cm. broad, glabrous above, the venation 
prominulous, beneath minutely puberulous and paler, the venation more promi- 
nent; primary veins 9 to 14; margin entire, slightly revolute. Stipules 3 mm. 
long, lanceolate, pubescent, caducous. 
Receptacles solitary in the axils of the leaves, pedunculate, irregularly ob- 
conical with a broad, flat or slightly convex apex 1 to 1.5 cm. in diameter, the 
whole surface more or less covered with orbicular peltate bracts, brownish and 
minutely grayish-puberulous; peduncles slender, 10 to 15 mm. long, minutely 
puberulous, as also the free spaces on the receptacles. Male flowers yellow. 
bractless, scattered over the empty spaces on the surface of the receptacle; 
perianth tubular, 0.2 to 0.4 mm. high, funnelform, monophyllous but open on 
one side, minutely puberulous; stamen 0.6 to 0.7 mm. long, exserted; filament 
thick, erect ; anther 2-celled. Female flowers 2 or more to each receptacle, with- 
out a perianth; style slender, with only the 2 divaricate stigmas showing above 
the surface of the receptacle. 
Fruit (immature) globose-subpyriform, 1 or 2-seeded. 
Type in the U. S. National Herbarium, no. 679477, collected on hills back of 
Puerto Obaldfa, San Blas Coast, Panama, in flower, September 2, 1911, by 
H. Pittier (no. 4336). 
EXPLANATION OF PLATE 7.—Type specimen of Piratinera panamensis Pittier. Natural 
size, 
CHARACTERS OF BROSIMUM AND LIST OF SPECIES. 
Brosimum Swartz, Prodr. Veg. Ind. Occ. 12. 1788. 
Flowers without a perianth. Stamen 1, the anther 1 or 2-celled. Female 
flowers 1 on each receptacle, without a perianth, the ovary sunk into the recep- 
tacle, with a long style and long, divaricate or erect stigmas. 
Fruit globose, 1-seeded. 
Laticiferous trees; leaves membranous or coriaceous, of variable size, entire; 
stipules lanceolate, caducous; receptacles pedunculate, solitary or geminate in 
the axils of the upper leaves, globose; flowers intermixed with numerous pel- 
tate bractlets. 
Type species, Brosimum alicastrum Swartz. 
