cillatis.— S. brasiliensis, H.B.K., Nov. Gen. et Sp. vol. vii, p. 170? 
vix Willd.— Micrandra ternata, R. Br. Pl. Jav. Rar. p. 237. 
Common in the gap6 of the Rio Negro and of its tributary the Rio 
Uaupés, and known by the name of Seringue de gapd. The tree scarcely 
exceeds 25 feet, but the branches spread out horizontally, sometimes 
to a considerable distance. The milk is sparing, and elastic when dry. 
The leaves are like those of S. elastica, but always more or less pubes- 
cent underneath, generally 4 or 5 inches long; the flowers of a reddish- 
purple. The anthers are small and ovate, in two distinct verticils, 
sometimes both complete, with five in each, but one or two are fre- 
quently wanting in the upper one, and occasionally one also of the 
lower one. Some specimens in fruit of Mr. Spruce’s first Barra collec- 
tion were distributed as belonging doubtfully to the S. elastica. I have 
referred here Mr. Brown’s species, on account of the pubescence of 
the underside of the leaf. 
Bentham did not cite any specimens in connection 
with the description of Stphonia discolor. However, we 
find preserved at Kew two of Spruce’s collections which 
have been annotated, one apparently in Bentham’s own 
hand, as representing Siphonia discolor. One of these 
collections (Spruce 1171) was made ‘‘ad oram septen- 
trionalem flum. Amazonum, ad ostium Rio Negro’’ in 
August 1851 and represents the expression of Hevea 
Spruceana which is abundant in the vicinity of Mandos. 
The other (Spruce 2560) was collected ‘‘prope Panuré 
ad Rio Uaupés in the period from October 1852 to Jan- 
uary 1858 and is the type of Mueller’s Hevea Bentham- 
iana. We are certain that these two collections entered 
into Bentham’s consideration of Hevea discolor, for we 
know: (1) that HZ. discolor was based upon Spruce col- 
lections; (2) that Bentham’s geographical data (‘‘com- 
mon in the gapo of the Rio Negro, and of its tributary 
the Rio Uaupés’’) correspond to the localities of Spruce 
1171 and 2560; and (8) that there are no other contempo- 
rary collections annotated with the binomial under dis- 
cussion. 
Furthermore, in Spruce’s field notebook, preserved at 
Kew, we find the following annotation against his collec- 
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