Cecropiaceae: Coussapoa and Pourouma, with an ... - CNCFlora

128 Flora Neotropica
ment is rather short, and the leaf base is deeply tinct forms of the subspecies in the same area
to shallowly cordate. Some collections from the and the absence of intermediates between these
southern part of the Amazon Basin (Bolivia and forms.
adjacent parts of Brazil) usually have 5-7-fid to
-parted leaves, while elsewhere in the Amazon
Basin the leaves are 3-lobed to -fid or entire.
Most collections from the Guiana region and the
Lower Amazon Basin have 3-fid leaves with a
shallowly cordate to truncate leaf base or entire
leaves; the indument is short, and the brown,
pluricellular hairs on the twigs are usually dense.
Material from the Upper Amazon Basin is
much more variable. Some of the collections have
almost elliptic (to oblong) entire leaves. Another
group of collections have entire leaves (often with
relatively short petioles) or 3-fid to -parted,
sometimes 5-parted leaves with the lobes rather
close together, due to a smaller angle in which
the main basal lateral veins depart from the midrib.
These collections often have sparse pluricellular
hairs on the leafy twigs, and those with
entire leaves resemble P. velutina, from which
they differ in a greater number of lateral veins.
A third group of specimens have 3-fid to -parted
leaves with a deeply cordate leaf base, often with
overlapping lobes. Several of these collections
have relatively long yellow hairs on the leafy
twigs and stipules, or have a rather densely hirtellous
upper leaf surface. The collections with
long, yellow hairs usually have stipules in which
the inner surface is rather densely hairy, unlike
the other collections of subsp. guianensis which
have the inner surface of the stipules glabrous or
sometimes with very sparse, white hairs. Three
collections (Croat 20616, Krukoff4817 and 8369)
have 3-fid, deeply cordate leaves and long, yellow
hairs on various parts, including the inner surface
of the stipules and more numerous lateral veins
(up to 25 pairs), in medium-sized leaves less than
1 cm from each other. Other collections ofsubsp.
guianensis (and collections of subsp. venezuelensis)
have the lateral veins more than 1 cm from
each other.
The material examined does not provide clear
indications about the nature of the various forms
within the subspecies no more than about the
distribution of these forms. Material received
from an inventory of a forest in the Upper Rio
Moa region (Brazil, Acre) by Campbell and collaborators
indicates the presence of several dis-
In several specimens from the Upper Amazon
Basin the leafy twigs, petiole, stipules, and lower
surface of the lamina are covered by a white
layer, actually the mycelium of some fungus which
apparently uses the pluricellular hairs as a substrate.
lb. Pourouma guianensis Aublet subsp. venezuelensis
(Cuatrecasas) C. C. Berg & van Heusden,
Proc. Kon. Ned. Akad. Wetensch., Ser.
C. 91(2): 106. 1988. Fig. 61.
Pourouma venezuelensis Cuatrecasas, Bol. Soc. Venez.
Ci. Nat. 15: 107. 1954. Type. Venezuela. Aragua:
Parque Nacional Henri Pittier, 20 Nov 1953 (6),
Aristeguieta 2005 (holotype, F, not seen; isotype,
VEN).
Leafy twigs yellow-hirsute, brown, pluricellular
hairs dense. Lamina 3-5-fid to -parted, base
? deeply cordate; lateral veins 16-26 pairs; stipules
outside yellow-hirsute, inside with yellow
hairs. Fruiting perianth 2-2.5 cm long.
Distribution (Fig. 60). Northern Venezuela
(Aragua, Carabobo, Miranda, and Yaracuy),
coastal mountains; in forest at altitudes between
ca. 1000 and 1200 m.
Specimens examined. VENEZUELA. ARAGUA: Parque
Nacional "H. Pittier," 20 Nov 1953 (6), Aristeguieta
2005 (VEN, type collection of P. venezuelensis),
12 Mar 1964 (6), Ijjdsz-Madriz 28 (VEN), 24 Dec 1946
(9), Lasser 2202 (VEN); Rancho Grande, 30 Dec 1946
(6), Lasser 2267 (VEN); Guamitas, 5 Nov 1947 (6),
Pittier et al. 15641 (US, VEN); Parque Nacional "H.
Pittier," 6 Jan 1968 (st), R. F. Smith V-3321 (VEN);
Chorni, 39 Apr-1 May 1972 (2), Steyermark et al.
105863 (NY, VEN); Agua Amarilla, 12 Nov 1947 (6),
Tamayo 3370 (VEN), Rancho Grande, 26 Mar 1938
(9), LI. Williams 9983 (A, F, GH, NY, US, VEN).
CARABOBO: Between Valencia and Campanero, 7 Mar
1860 (2), Fendler 2420 (G); Cumbre de Valencia, Pt.
Cabello, without date (6), Karsten s.n. (LE); E of Los
Tangues, S of Borburata, 31 Mar 1966 (9). Steyermark
et al. 95378 (NY, VEN, U). MIRANDA: Guatopo, 19
Nov 1956 (9), Bernardi 5696 (VEN), Bernardi s.n. (NY);
San Juan, 18 km SW of Cupira, 2-7 Sep 1977 (6),
Gonzalez et al. 1319 (BG); S of Santa Cruz, Mar 1978
(2), Steyermark et al. 116884 (BG); 11 km SSE of El
Guapo, 27-28 Mar 1978 (2), Steyermark et al. 116966
(U). YARACUY: N of Salom, 4 Mar 1982 (st), Liesner
et al. 12394 (U).