436 



CONTRIBUTIONS FROM THE. NATIONAL HERBARIUM. 



pubescent outside, urceolate or globose before anthesis, opening into 4 stipitate lobes. 

 Stamens 4, introree in the closed perianth, exserted later; filaments about 1.5 mm. 

 long, broad and flattened at base, more or less twisted; anthers ovoid, about 1.2 mm. 

 long. Pollen minute (about 0.012 mm. in diameter) with 3 (or 4) pores. 



Type in the U. S. National Herbarium, no. 577150, collected along the river Hacum, 

 near Terraba, Diqufs Valley, altitude about 150 meters, February, 1892, by A. Tonduz. 

 Male flowers only. 



Costa Rica: Type collection; woods of Curr£s near Boruca, Diqufs Valley, at about 

 50 meters altitude, Pittier, male flower only, March 4, 1898 (Institute ffs. geog. Costa 

 Rica, no. 12101; U. S. National Herbarium, no. 615381). 



Species characterized by the long, curved acumen of its leaves, which are also 

 mostly bent sidewise (i. e., in dried specimens, toward the twig to which they are 

 attached.) 



Fig. 61.— Olmedia caucana, 

 details of male flower. 

 a, Tip of floral bud be- 

 fore anthesis; b, open 

 flower, early stage; c 

 open (lower after dehis- 

 cence of the anthers; 

 d, d', d", various stages 

 in the development of 

 the anthers. Scale 3. 



Fig. 62. — Olmedia grandi- 

 folia, male flower and 

 stamen, a, Male flower; 

 b, stamen inserted at 

 base of one of the peri- 

 anth segments. Both 

 enlarged. FromTrecul, 

 Ann. Sci. Nat. III. 8: 

 pi. S. 



PEREBEA. a 



Fig. 63.— Olmedia falcifolia, details 

 of male flower, o, Outer bract; 

 b, inner bract; c, floral bud; 

 d, d', d", stamens at different 

 stages. Scale 6. 



Our knowledge of this genus, the typo of which is Perebea gui- 

 anensis Aubl., is very defective. Its species are dioecious, according 

 to Bentham and Hooker, b and this seems to be generally the case, 

 although Karsten c expressly refers to his P. xa-nthochyma as a 

 monoecious species. 



In the male flowers the perianth is 4-parted, with thick, biseriate, 

 imbricate divisions, this again agreeing with Bentham and Hooker's 

 definition. But Engler says, ' ' Bluthenhiille der mannlichen Bl Qthen 

 4-teilig mit dicken Abschifitten in 2 Kreisen." It is not easy to 

 understand how the segments of a monophyllous perianth can be 

 placed alternately in two concentric circles. In P. integrifolia 

 Karat., represented with P. xanthochyma in the above-cited plate 

 102, we see, however, that the perianth is divided almost to the 

 base and that two of the divisions, apparently smaller, are exterior. 



a Perebea Aubl. PI. Guian. 2 : 953. 1775. b Gen. PI. 3 : 373. 1880. 



cFl. Columb. 2 : 23. pi. 102. 1869. 



