164 ROWIvEE: SYNOPSIS OF THE GENUS OCHROMA 



narrowing into a broad claw 2 cm. wide, prominently parallel-veined. — 

 Flowering in July and August; fruiting in September and October. 



Type in the U. S. National Herbarium, collected below Huigra, 

 Ecuador, in 1918, by J. N. Rose (no. 22,604). Also collected at 

 Hacienda La Josefina, San Carlos, Ecuador, vSeptember, 191 8, by 

 Capt. Claussen. 



5. Ochroma tomentosa Willd. Enum. Hort. Berol. 695. 1809 



Humboldt's balsa. 



The original description of this species is as follows: "O. foliis 

 cordatis subtrilobis repandis, subtus tomentosis." It was based on 

 specimens collected by Humboldt and Bonpland in "America Meri- 

 dionali," and was reported from Colombia by Triana and Planchon 

 in 1862.^ It has been collected recently by Rusby and Pennell (no. 

 271), July 24, 1917, at Quebrada de Angeles, above Natagaina, De- 

 partment of Huila, Colombia, and also by Pennell (no. 3557), at 

 Honda, Department of Tolima, Colombia. The collectors noted it 

 as a large tree with white petals. 



The calyx tube is very coarsely and densely tomentose with brown 

 hairs; the tube is short and broad. Most characteristic of the species, 

 however, are the repand dentations, i cm. apart, evenly distributed 

 around the margin of the leaf, giving it the appearance of the leaf of 

 Populus grandiden lata . 



Ochroma tomentosa has not been reported beyond the limits of the 

 upper Magdalena River in Colombia, a region through which Hum- 

 boldt's expedition passed. 



6. Ochroma velutina, n. sp. Red Pacific Coast balsa. 

 Wide-spreading tree, usually bifurcately branched, with smooth, 



light gray bark; heartwood reddish; young shoots and leaves densely 

 velvety-tomentose; leaves ovate, with wide sinuses at the base, ob- 

 soletely 3-lobed, or more often entire, the lobes when present rounded; 

 blades variable in size, thick and firm, longer than broad; stipules 

 brownish tomentose, i to 1.5 cm. long and half as wide, when large 

 inclined to be auriculate and notched at the side, when small, oblong 

 and rounded at the apex; flowers small, about 8 cm. long, the pedicels 

 of about the same length; calyx tube firm and woody, cylindric, 4 cm. 

 long, glabrous externally at maturity, within densely clothed with 

 ascending appressed brown liairs; calyx lobes very dissimilar, the 2 

 outer triangular, 1.5 cm. long, tlie inner 2.5 cm. long, with wide felt- 

 like margins; petals about 8 cm. long, broadened toward the apex; 

 pod 10 to 15 cm. long, tapering at the ends. 



Type in the U. vS. National Herbarium, no. 472290, collected "dans 

 les for^ts et paturages de Nicoya," Costa Rica, February, 1900, by 



» Ann. Sci. Nat. IV. Bot. 17: :i22,. 1862. 



