A new species of Pavonia (Malvaceae) from the Atlantic coastal forests of eastern Brazil
Author
Fryxell, Paul A.
text
Phytotaxa
2009
2009-12-31
2
13
18
http://biotaxa.org/Phytotaxa/article/view/phytotaxa.2.1.2
journal article
10.11646/phytotaxa.2.1.2
1179-3163
4776105
Pavonia paucidentata
Fryxell
,
sp. nov.
(
Fig. 1
)
Arbores ad
4 m
altae caulibus glabrescentibus, laminis foliorum coriaceis glabris anguste ellipticis penninervibus distaliter grosse paucidentatis acutis vel acuminatis, stipulis linearibus rigidis
25–31 mm
longis, petiolis adaxialibus barbatis, pedicellis axillaribus solitariis
7–14 cm
longis distaliter pubescentibus cetera glabris, bracteis involucellorum ca. 8 lanceolatis 14–18 x
3–4 mm
, in margine ciliatis, petalis ut videtur luteis quam involucellis subaequantes, genitaliis inclusis, fructibus ignotis.
FIGURE 1.
Pavonia paucidentata
. Type specimen:
Fiaschi et al. 2533
(NY).
Type
:—
BRAZIL
:
Bahia
:
Estrada
de Valenço
para
Guaibim
ca.
2 km
, entrada à esq.,
8 km
, ramo vicinal à esq.
RPPN
Agua Branca
,
15°19’44”S
,
39°5’25”W
,
220 m
,
9 April 2004
,
P. Fiaschi
,
J.G. Jardim
&
J.L. Paixão
2533
(
holotype
NY!, isotype CEPEC)
.
Small tree to
4 m
tall, the young stems minutely and obscurely lepidote (the scales <0.1 mm in diameter), becoming glabrescent, the older stems with longitudinal ribs. Leaf blades leathery, narrowly elliptic,
8–20 cm
long, 2.5–
6 cm
wide (smaller upward), at base narrowly rounded or auriculate-cordate, the margin continuously ribbed, proximally entire, distally coarsely few-toothed (the teeth prominent), acute or acuminate apically, glabrous above and beneath, basally 3-veined, penninerved (the midrib prominently raised beneath), with 6–9 pairs of lateral secondary nerves also prominently raised beneath. Petioles
2–6 cm
long, bearded on adaxial side, the hairs 0.5–
1 mm
long, mostly simple, otherwise glabrous. Stipules persistent, solitary or sometimes divided into 2 elements, linear or subulate,
25–31 mm
long,
1 mm
wide, rigid, erect and slightly curved (
in sicco
), glabrous. Pedicels solitary in the axils of the uppermost leaves,
7–14 cm
long, terete, obscurely articulated
2–5 mm
below the calyx, distally pubescent (hairs simple, 0.5–
1 mm
), otherwise subglabrous. Involucel of ca. 8 distinct bracts, each lanceolate,
14–18 mm
long,
3–4 mm
wide, dorsally minutely lepidote, marginally ciliate, the hairs ca.
1 mm
long. Calyx
8–9 mm
long, partially concealed by the involucel, minutely pubescent and marginally ciliate like the involucellar bracts. Petals apparently yellowish, subequal to involucel at anthesis. Genitalia included in corolla (i.e., not exserted). Fruits not seen.
This new species keys out to
Pavonia calyculosa
St.
-
Hilaire & Naudin (1842: 40)
using the key provided by
Fryxell (1999: 237–239)
, but differs in the prominent distal teeth of the leaf margins, the much longer stipules, the shorter and broader involucellar bracts, and a different pubescence pattern.