Two New Species of Hillia Subg. Ravnia (Rubiaceae) from Venezuela and Mexico

3 Pages·1991·2.1 MB·

by  Charlotte M Taylor

.
NOTES
TWO NEW
OF
SPECIES
RAVNIA
HILLIA SUBG.
FROM
(RUBIACEAE)
AND
VENEZUELA MEXICO
mm
1-2
HllUa genus of about 24 species of 6-merous; peduncles long; bracts linear,
Jacq. a
is
mm,
x ovary
succulent, usually epiphytic shrubs found through- 12 ca. 0.5 acute; cylindrical, ca. 1
cm
out the moist and wet Neotropics. Subgenus Rav- long, glabrous; calyx limb green, coriaceous,
mm
0-1
M.
nia (Oersted) C. Taylor includes three species glabrous, divided nearly to base, tube
found in Costa Rica and Panama, plus the two long, the lobes very narrowly triangular to linear,
mm
mm
The 18-36 1.5-2
species described below. characteristics of this long, wide at base, acute;
membranaceous,
subgenus have been presented previously (Taylor, corolla funnelform, dull red ex-
989). Recent collections have brought to scientific ternally, yellow-green internally, glabrous through-
1
mm
cm
the following two undescribed species, which out, tube 3.2-5.9 long, 3-3.5 wide at
light
cm 6-10
are placed subg. Ravnia based on the form and base, the lobes triangular, 0.8-1 long,
in
mm
color of their corollas, which are tubular to nar- wide at base, rounded to acutely angled, re-
and stamens
rowly funnelform, generally red in color, pre- flexed to revolute; partially exserted,
fil-
34 mm mm
4-6
below
sumably bird-pollinated. aments long, inserted ca.
mm
8-9 3.4-
mouth of tube, anthers long; style
cm 1-2
M. Ven- 6.5 long, stigma exserted, capitate, ca.
Hillia rivalis C. Taylor, sp. nov. TYPE:
mm
woody
Amazonas: diam. Capsules cylindrical, to rather
Federal Depto.
ezuela. Territorio
cm cm
5-6.5 0.8-1
Atabapo, Cerro Marahuaca, 3°43'N, 65^30' W, papery, brown, smooth, long,
cm
1-1.5
1988 diam., borne on a stipe long; seeds 1.5
1,200 m, 16 Oct. R. Liesner
(fl, fr),
cm
mm,
X 0.3-0.5 with trichomes 1.2-1.5
24900 MO; YEN). ca.
(holotype, isotype, Fig-
long.
ure
1
m This new species was found growing on rocks
Frutex subsucculentus, saxicola, glaber, ca. altus.
1
Folia peranguste elliptica, 38-100 x 5-10 mm, apice in and along rivers, a habitat that has not been
mm
6-12
x
basique acuta; petiolo longo; stipulis 10 13 and which em-
previously reported in Hillia,
is
mm
3-4 mm. 1-2
pedunculo
Flores 6-meri;
solitarii, One
was
phasized in the specific epithet. site in-
18-36
peranguste
longo; lobulis calycinis triangularibus,
undated a few days after the specimen was collected
X 1.5-2 mm; corolla infundibuliformi, externa sordide
mm
32-59 comm.); presumably these pe-
(R. Liesner, pers,
rubra, interne luteoviridi, tubo longo, lobulis
8-10 6-10 mm;
X antheris ex parte exsertis. Capsula rennial plants are adapted to such disturbance. In
mm
50-65 x 8-10 mm, 10-15
cylindrica, laevis, stipite
morphology, and capsule texture, H.
habit, leaf
longo.
Mesoamerican
strongly resembles the shrub
rivalis
Lindenia Bentham, which grows
somewhat shrubs rivalis in similar
Glabrous, succulent, lithophytic
m
bark smooth, red-brown gray-brown. These genera are apparently not closely re-
to to sites.
1 tall;
Leaves blades narrowly 3.8 lated, and the resemblance apparently one of
isophyllous; elliptic, is
convergence
10 X 0.5-1 cm, narrowly acute at apex and base,
coriaceous and hard upon drying, glabrous; sec- Hillia rivalis can be distinguished by its re-
ondary veins 4-5 pairs, obscure, pinnate, ascend- markably long, narrow calyx lobes, funnelform co-
the 1-2 veins looping to interconnect, roUas that are red externally but yellow-green in-
ing, distal
narrow and
thc midrib prominulous abaxially, the margins ternally, relatively leaves, riverine
mm
6-12
involute; petioles long, glabrous; habitat.
slightly
narrowly or lanceolate, 10- 13 x The floral morphology of this species strongly
stipules elliptic
3-4 mm, membrana- resembles that of several other species of Hillia
acutely broadly angled,
to
ceous, glabrous, caducous. Flowers solitary, with funnelform green corollas and pinnate leaf
521-523.
Ann. Missouri Bot. Card. 78: 1991.
522 Annals of the
Garden
Missouri Botanical
24900
Fkujre {Liesner MO),
1. Ilillia rivalis habit.
psammophila between former genus Ravnia and
venation, notably Steyermark, tionship the
//.
Schumann,
H. illustris (Vellozo) K. //. foldatsii lliUia.
member
Schumann
Steyermark, and saldanhaei K. This the report of a of this
//. is first
The
The found subgenus from South America. rather wide
(Taylor, in prep.). characteristics in this
and dimensions
species provide further evidence of a close rela- ranges of calyx lobe, corolla, style
Volume Number
2
78, Notes 523
1991
mm
mm
angular, 6 1,5-2
long, wide
at base,
rounded;
corolla tubular to narrowly funnelform,
carnose, red in tube, green on lobes, glabrous
mm
cm
throughout, tube 3.8 long, 2 wide
at base,
mm,
x
the lobes triangular, 2.5 2.5 broadly round-
spreading stamens
ed, to reflexed; included,
in-
mm
serted above middle of tube, anthers 4
long,
mm
1-2 mouth cm
held below of tube; style 4
long, stigma exserted, with two clavate branches
mm
3 Capsules known.
ca. long. not
oaxacana
Hillia can be by
distinguished
its
tubular red corollas with green lobes and leaves
its
&
C
Figure 2. Hillia oaxacana {Garcia M. Torres
with the secondary veins arising from below the
all
1523 MO),
habit.
middle of the blade ("subpalmate").
In
corollas,
its
oaxacana
H,
similar to H. longijilamentosa
is
M.
(Steyerm.) C. Taylor of Costa Rica and Panama,
are derived from measurements of apparently ma- which
differs in its completely red-orange corollas
ture structures all found in the same collection. and long-exserted stamens. This new
species also
is
Comparable
variation is found in other species of similar to H. saldanhaei K. Schum nn
Hillia (Taylor, in prep.). a poorly known species with similarly shaped but
mm
6-7
u green corollas with lobes lon^e. Similar
Parat,ype. V\Tenezuela, territorio federal
^
su,bpal, mate
,leaf venation found only H,
AMAZONAS: Depto. Atabapo, Cerro Marahuaca, 3°38'N, is in ulei
K. Krause Amazonian
65''28'W, 1,225 m, 19 Feb. 1985 (fr),/?.I/e5neri7772 of South America, which
(^^)-
differs in broadly funnelform green
its corollas.
{Hillia ulei here treated to include H.
is viridiflora
oaxacana &
Hillia C. M. Taylor, sp. nov. TYPE: Kuhlmann Silveira, H. irwinii Steyermark, and
Mexico. Oaxaca: distrito de Putla, Arroyo de H. schultesii Steyermark.) Reported here the
is
km
San
Isidro, 3 al este de Concepcion, Bue- northernmost record of a member of subg. Ravnia.
&
navista, 10 June 1985 A. Garcia M. Specimens
(fl), of the type collection were originally
MO;
R. Torres 1523
C. (holotype, isotype, annotated and macrocarpa
distributed as Stan-
77.
MEXU).
&
Figure
2. dley Steyermark, which H. oaxacana keys out
to in the Rubiaceae treatment for the Flora of
Frutex succulentus hemiepiphyticus,
glaber. Folia
el-
WiUia
liptica, 4.2-6 x 2-2.5 cm, apice acuminata, basi cu-
mm
5-8 thank Manara
neata; petiolo longo. Floras solitarii, 6-meri; I R. Liesner for field data, B. for
mm
2-3
pedunculo
longo; lobulis calycinis lingulatis, ca. the illustration of H. rivalis, R. E. Gereau and B,
mm;
6 X 1.5-2
corolla tubiformi vel aneuste infundi- r
\Mjar nara < v..u Lt atx-m •^-
lor assis.tance with composition, andi
f u o o cm L ji
buliforme, .tubo rubv.ro ca. 3.8 1longo, 1lobulIis vi- ridibus
X mm; P. Berry, B. Hoist, and R. E, Gereau for critical
ca. 2.5 2.5 antheris Capsula
inclusis. ignota.
comments.
Glabrous, succulent, hemiepiphytic shrubs; bark
smooth, Leaves
gray. isophyllous; blades
elliptic^
Literature Cited
4.2-6 X 2-2.5 cm,
acuminate apex
at with the
&
mm Standley,
p. C. L. O. Williams. 1975. Flora of
tip ca. 5 long, cuneate at base, subcoriaceous, —
Guatemala IX
Part (Rubiaceae). Fieldiana, Bot.
3-4
glabrous; secondary veins pairs, rather ob-
1-274.
24(11):
scure, subpalmate, ascending, not looping to in- Taylor, C, M. 1989. Revision of ^iZ/m subg. /?afrtia
terconnect, not prominulous, margins (Rubiaceae: Cinchonoideae). Selbyana 26-34.
straight; /?e^ 11:
mm
5-8 In prep. Revision of Hillia (Rubiaceae: Cin-
ioles long, glabrous; stipules not seen. .
chonioideae).
mm
2-3
Flowers 6-merous; peduncles
solitary,
mm
long; bracts absent; ovary cylindrical, ca. 3 Charlotte M. Taylor, Missouri Botanical Gar-
long, glabrous; ca/j:^ limb green, membranaceous, den, P.O. Box 299, Louis, Missouri 63166-
St.
glabrous, divided to base, the lobes narrowly 0299, U.S.A.
tri-