flora neotropica - CNCFlora

Systematic Treatment 87
Additional Notes and Descriptions
of Species of Hirtella
7-4. Hirtella dorvalii Prance, Fl. Neotrop.
Monogr. 9: 273. 1972.
55. Leaves 7-13 cm long, 3-5 cm broad, chartaceous; inflorescence 2-
3-flowered. 87. H. pauciflora.
55. Leaves 3.5-5.5 cm long, 1.5-2.7 cm broad, thick-coriaceous; inflorescence
many-flowered.
88. H. glaziovii.
54. Fertile stamens 4-6; inflorescence puberulous to tomentellous, manyflowered;
filaments far exceeding calyx lobes.
56. Leaves thick coriaceous; inflorescence 4-15 cm long. 56. H. racemosa.
56. Leaves chartaceous; inflorescence 2-4 cm long.
57. Leaf apex bluntly acuminate or acute; petioles 0.5-1 mm; flow-
ers ca. 3 mm long.
Distribution and habitat (Fig. 128). This little
known myrmecophilous species was described
from a single specimen by Prance (1972). Further
collections, all from the same area, near Cara-
carai, indicate that this is a locally abundant
species occurring only in low caatinga forest on
sandy soils.
Additional specimens examined. BRAZIL. TERR.
RORAIMA: Rio Ajarani, 28 May 1974 (fl), Pires & Cavalcante
14375 (IAN, INPA), 1 Jul 1974 (fl), Pires & Leite
14849 (IAN, INPA); Caracarai, 27 Apr 1974 (fl), Pires
& Cavalcante 14360 (IAN, NY).
7-6.1. Hirtella revillae Prance, Acta Amazonica
8: 587, 89, fig. 6. 1979. Type. Peru. Loreto:
Maynas, Rio Nanay, 4 km from Mishana, 150
m, 19 Jan 1975 (fl), Gentry, Ayala & Revilla
15807 (holotype, NY; isotype, MO).
55.1. H. arenosa.
57. Leaf apex caudate; petioles 1.5-2.5 mm; flowers ca. 6 mm long.
55.2. H. conduplicata.
in even at throat except around base of ovary;
pedicels 8-15 mm long, hirsute. Calyx lobes five,
lanceolate, hispid on exterior. Petals five, white,
glabrous. Stamens six, the filaments far exceeding
calyx lobes. Style hirsute on lower portion
only. Ovary inserted at mouth of receptacle, glabrous
around base. Fruit not seen.
Distribution (Fig. 128) and phenology. Known
only from the Rio Nanay in Peru, collected in
flower from November through March.
Habitat. Upland forest on white sand, poorly
drained, swampy.
Additional specimens examined. PERU. LORETO:
Maynas, Mishana, Rio Nanay between Iquitos and
Santa Maria de Nanay, 13 Nov 1977 (fl), Gentry 20678
(NY), 25 Feb 1981 (fl), Gentry et al 31725 (MO, NY),
19 Mar 1982 (fl), Gentry et al. 36438 (MO, NY).
Hirtella revillae belongs to the section Myrmecophila,
in which the swollen ant cavities at
the leaf bases, and hispid pubescence are characteristic
of all members. It differs from the other
species in the section in the very long pedicels
and in the distinctive dense hirsute pubescence
of the pedicels and flowers, and the glabrous ovary
and mouth of the
Trees 8 m tall, the young branches
receptacle. It is most closely
hispid. Leaf
related to H.
lamina oblong, chartaceous-membranous, 19-22
physophora.
x
The inflorescence is of rather intermediate
8-10 cm, rounded at base and bearing two
swollen ant cavities, abruptly acuminate at length in comparison to other species of section
apex,
the acumen 7-10 mm long, hirsute on venation Myrmecophila, which have either much more
beneath, with sparse appressed hairs on compact fasciculate inflorescences or elongate raupper
cemes or
surface; midrib
panicles. Only Hirtella duckei has raprominent
beneath, prominucemose
inflorescences as short as H. revillae but
lous above, hirsute on both surfaces; primary
H. duckei differs in
veins 13-17
many other ways.
pairs, prominent beneath, prominulous
above. Stipules linear, persistent, hispid.
7-9.1. Hirtella confertiflora
Inflorescences of axillary racemes 5-6 cm
Prance, Brittonia 33:
long, 354. 1981.
the rachis light brown hispid, the lower Type. Venezuela. Amazonas: Rio
pedicels
longer than the upper ones giving a slightly cor-
Coro-Coro, 5?35'N, 50?10'W, 22 Feb 1979 (fl),
ymbose appearance. Bracts and bracteoles
Steyermark et al. 117921 (holotype, NY; isolinear,
persistent, hispid. Flowers 8-10 mm types, MO, VEN).
long (excluding
pedicels). Receptacle campanulate, light Tree 4 m tall, the young branches densely ferbrown
hispid-hirsute on exterior, glabrous with- rugineous tomentose. Leaf lamina oblong-ellip-