transferred forma /eiogyne trom H. membranacea to H. 
pauciflora. 
Seibert (1. c. 800) reduced to synonymy under Hevea 
paucifilora not only H. membranacea, but also all of the 
several trinomials referring to the concept which Ducke 
has variously designated by the epithet /etogyne. A study 
of representative material both in the field (in the type 
locality) and in the herbarium convinces me that the dis- 
tinguishing character given for the /ecogyne concept is 
not sufficiently stable to warrant the creation of a dis- 
tinct taxonomic entity. 
Hevea pauciflora (Spruce ex Benth.) Mueller- 
Argoviensis var. coriacea Ducke in Arch. Inst. Biol. 
Veg. Rio Janeiro 2 (1985) 239. 
Hevea confusa Hemsley in Hooker Icones Plant. 26 
(1898) 2, t. 2570; t. 2575, figs. 1-8, 12-18. 
Hevea minor Hemsley |. c. 26 (1898) t. 2572. 
? Hevea camporum Ducke in Arch. Jard. Bot. Rio 
Janeiro 4 (1925) 111. 
Hevea humilior Ducke in Rev. Bot. Appl. Agric. 
Trop. 9 (1929) 624, 629, t. 18. 
Hevea pauciflora (Spruce ex Benth.) Mueller-Argovi- 
ensis ssp. coriacea Ducke in Arch. Inst. Biol. Veg. 
Rio Janeiro 2 (1935) 2389. 
When Ducke described this subspecific variant of 
Hevea pauciflora, he pointed out that it ‘“‘differs from 
pauciflora typica by the smaller size of all its parts, and 
by the thicker adult leaves which are rigidly membrana- 
ceous or (in the caatinga-vegetation of the upper Rio 
Negro) hardly coriaceous’’ [undoubtedly meaning ‘‘hard- 
coriaceous’ ]. Since its description by Ducke, this con- 
cept has been found to be relatively widespread and has 
commanded an appreciable amount of attention; the tri- 
nomial has been used in the literature (Schultes in Bot. 
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