276 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



5 mm. long. 3 nun. broad), ovate to ovate-lanceolate, with free tips. Intersta- 

 minate bracts very few, small, ovate-lanceolate or acuminate, ciliate. Stamens 

 glabrous, numerous and v„ery close together, 3 to 4.5 mm. long; filaments 2.5 to 

 3 mm. long, slender: anther cells narrow, attached laterally on a thick, expanded 

 connective. 



Receptacles of the secondary staminate inflorescence single or geminate, hairy, 

 1.8 to 2.8 cm. long, clavate, rounded and scarcely open at the tip. Stipes thick, 

 1 to 1.2 cm. long, provided with 1 to 3 irregular whorls of scale-like bracts, with 

 dark, free, scarious tips. Scales of the receptacle broadly rounded, acuminate, 

 also with free, dark tips. Interstaminal bracts absent. Stamens 3.5 to 6.5 mm. 

 long, glabrous, distributed in irregular lines connected by a thin membranous 

 band; filaments cylindrical, rather slender, 2 to 4 mm. long; connective large, 

 scutellate; anther cells narrow. Receptacle of the pistillate inflorescence sessile, 

 shallow, covered outside with 4 or 5 rows of hairy, concrescent, imbricate scales, 

 these broadly ovate-acuminate near the base, lanceolate-acuminate near the 

 margin. Flowers 5.5 to t> nun. long, half immerged in the receptacle. Free 

 part of the perianth thick, hairy outside and inside, irregularly 3 to 5-toothed. 

 Style rather thick, about 1 mm. long; stigmas yellow, 

 elongate, narrowly lanceolate, spirally twisted at the 

 ends. 



Fructiferous receptacles cupuliform but very shal- 

 low, 4 to 5 cm. in diameter, their scales broadly ovate- 

 acuminate, the marginal ones thick, pointed, half-free, 

 and corresponding to aborted flowers. Achenia 10 to 15 

 to each receptacle, orange red at maturity, adhering to- 

 gether for their lower half, the upper half being free, 

 more or less pyramidal, and slightly grooved. Seeds 

 roundish, 0..'H mm. long, 8.13 mm. in diameter, more or 

 less deformed by compression; 6 inner pellicula light 

 cacao brown; embryo small, conical, bifid, about 1.5 mm. 

 long. 



Costa Rica: Around Nieoya, at an altitude of about 

 300 meters, Tonduz, flowers, February, fruit, May, 1899 

 (Institute fis.-geog. Costa Rica no. 13723) : Cook iC- 

 Doyle, 673, flowers and fruit, May 22, 1903: Pittirr, 

 flowers and fruit. January, 1004 (IT. S. National Herbarium no. 578510) ; Colonia 

 Maceo, at about 100 meters altitude. Cook d Doyle 640; May 21, 1903, flowers 

 and fruit; Las Iluacas. altitude. !>oo meters, Cool,- ,C Doi/le 7o0, leaves only. 



Explanation of Plates 40-42.— IM. -10, a, young leaf of a seedling, showing serrate 

 margin; b, primary male inflorescence ; <■., part of branchlet showing complcmental and 

 pistillate Inflorescences. PI. 41, base of leaves and complcmental and pistillate inflor- 

 escences. PI. 42, fruits, terminal buds, and base of leaves. All natural size. 



This species has, in common with C. clastica, the long-stipitate male recepta- 

 cles, but it differs from that species by these being usually in clusters of only 

 4 ami each opening into a flat circular disk. These receptacles are also smaller, 

 with more slender stipes and larger scales. There are no interstaminate bracts 

 on the complemental inflorescences, while they are few or reduced to narrow, 

 continuous lamelhe on the primary male receptacles. The styles are glabrous. 

 and the pubescence on the twigs and leaves is longer, not so dense, and more 

 erect. 



Pig. 53. — Floral de- 

 tails of Castilla ni- 

 coyensis. a, b, Sta- 

 mens at various 

 stages ; o, longitudi- 

 nal section of fe- 

 male flowers. Scale 

 slightly less than 3. 



"Many of these achenia are abortive. 



6 Extreme dimensions of 10 seeds: Length, 8.04 and 10.00 nun.: diameter, 7.58 

 and 9.18 mm. 



