odically subject to very deep flooding. Spruce does not 
give us in his notes any indication of the shape of the 
trunk of Hevea minor, stating merely: ‘‘Arbor parva, 
15 pedalis.’’ If the trunk had deviated from a normal 
cylindrical shape, this careful observer would certainly 
have noted the fact. Hevea microphylla responds to its 
flood habitat by producing a swollen or bellied trunk, 
and it is called seringa barriguda (=bellied rubber) by 
the natives of Sao Joaquim on the Rio Negro, the same 
common name which is applied to H. Spruceana (Ducke : 
Bol. Teen. Instit. Agron. Norte no. 10 (1946) 21). 
CLAVIS SPECIERUM HEVEAE MINORIS 
ET H. MICROPHYLLAE: 
A. Arbor parva 15 pedalis, cum trunco probabiliter cylindrico, in 
caatinga occurrens. Folia concoloria, Capsula perfecte globosa, 
25 mm. X25 mm., cum pedunculo subgracili, 40 mm. longo; 
valvis 26 mm. longis, vix contortis, endocarpio lignoso, usque ad 
38 mm. crasso. Semina parva, complanato-ovoidea, 15 mm. X 
9 mm. X 11-12 mm., carina dorsali conspicua. Dehiscentia prob- 
abiliter explodens. 
1. Hevea minor 
AA. Arbor parva vel mediocris, cum trunco infra incrassato, in sylvis 
profunde inundatis occurrens. Folia discoloria. Capsula ovoideo- 
pyramidalis, apice valde acuta, 40-50 mm. * 30-40 mm., cum 
pedunculo robusto, 60-70 mm. longo; valvis 45 mm, longis, 
valde contortis, endocarpio vix coriaceo, valde tenuissimo, 0.3 
in diametro. Semina magna, elongato-obovoidea, subquadrangu- 
laria, 20-28 mm. 12-16 mm. < 17-18 mm., ecarinata. Dehis- 
centia ut videtur lenta. 
2. Hevea microphylla 
1. Hevea minor Hemsley in Hooker’s Icon. Pl. 26 (1899) tab. 2572; 
Pax in Engler’s Pflanzenr. 4, 147 (1910) 125. 
Venezurta: Rio Casiquiare, “‘in sylvis humilioribus. Arbor parva, 
15 pedalis. Siphonia.’’? Richard Spruce 3457 (Tyrus Herb. Kew). [In 
Spruce’s field note-book, preserved at Kew, the following annotations 
appear: “°3457. Siphonia—Casiq. Caatinga. Sm. tree 15 ft. Lts. sm. 
lane. acum. obt. Frt.’?] 
[8 | 
