3 NEW SPECIES OF THE GENUS PELEXIA (ORCHIDACEAE, SPIRANTHINAE) FROM COLOMBIA

8 Pages·1993·3 MB·English

by  D L Szlachetko

RHODORA,
Vol. No. 883/884, 277-284, 1993
95, pp.
NEW
THREE OF THE
SPECIES
GENUS
PELEXIA (ORCHIDACEAE, SPIRANTHINAE)
FROM
COLOMBIA
Dariusz Szlachetko
L.
I
I
4
ABSTRACT
1
The
genus Pelexia Poit. ex Lindl. occurs in the tropics and subtropics of both
Americas: from Argentina in the south to Mexico and Florida in the north. Ac-
cording to Garay (1982) contains 67 species. Pelexia distinguishable from
it is
i
closely related Sarcoglottis Presl by an "externally observable line of adnation"
between ovary and
lateral sepals.
While studying herbarium materials from col, p and found some specimens
s, I
which known They
did not the diagnoses of any previously species. are described
fit
here for the time.
first
Key Words: new Colombia
Pelexia, species,
PELEXIA CUNDINAMARCAE,
nov. (Figure
sp.
1)
Involucrum sub angulo ad ovarium incurvatum, tubu-
recto
loso-convolutum. Calcar saccelliforme, apice angusto, discreto,
ad ovario Auriculae camosae, ad unguiem
soluto. labelli crassae,
adnatae, epichilio longitudinis aequantes. Hypochilium obova-
tum, minutum,
epichilium valde incrassatum.
triangulare,
mm
10-450
mm
4-5
glandular, Cauline bracts
baceous, thin, acute, closely adnate to the stem, longer than in-
temodes, the uppermost reaches the base of the inflorescence,
glabrous except the uppermost, which sparsely glandular in the
is
basal portion. Leaves 3-5, basal; petiole long and narrow, up to
mm mm
mm
120 55-95 13-30 wide,
long; blade long, lanceolate,
on upper
acute, in pressed plants grayish-pale violet the surface,
mm
on 40-1 8-20-flow-
dull red the lower. Inflorescence 15 long,
medium
Flowers
ovary
Floral
ovary
Ovary
mm
mm
glandular. Dorsal sepal 11.5 long, 4 wide, ovate-lan-
nerved
277
Rhodora
278 [Vol. 95
I
b—
a—
Figure Pelexia cundinamarcae Szlach.: flower and floral bract; dorsal
1
.
c— d—
e—
f— spread;
sepal; petal; free portion of lateral sepal; basal lip auricles,
lip;
g—
rostellum remnant.
mm mm
lateral sepals 12.5 long, 3 wide, lanceolate, acute, slightly
mm
asymmetric,
3-nerved, glandular outside. Petals 11.5 long,
mm
adnate
2.6 wide,
linear-falcate, acute, single-nerved, slightly
to the dorsal sepal, ciliate on outer margins. Lip boat-formed,
Hypochile
straight, shortly clawed; claw very thick in the center.
*
Szlachetko-F^/^x/a
1993] 279
mm mm
2.5-13
long, 7.2 wide, obovate
1 in general outline, thick-
ened and
papillate along midnerve and near on
the base, thin
mm
mm
margins: 4-5
basal lip auricles long, 4.7-5.5 wide when
mm
spread, connate with the claw with free apices about 1.3-1.5
mm mm
long, very
fleshy, thick. Epichile 3.5 long, 4-4.2 wide,
obovate
to cordate, obtuse to subacute, papillate, thicker than
mm
Gynostemium
hypochile, column
fleshy. 9.5 long, erect; foot
ary
mm
mm
long.
COLOMBIA,
Type: Cundinamarca-Boyaca—
Deptos.
entre
Villa Pinzon y Ventaquemada, 2800-2900 m. Schneider 679/1
March
30 1953 (holotype: col
68326).
COLOMBIA,
Paratype: Boyaca— Ventaquemada,
Dept.
bei
288-2900 m, March
Schneider 30 1953
679,
(s).
ETYMOLOGY:
new name
eipthet of this entity based on the
of Department Colombia where was
the in the species found.
Pelexia cundinamarcae characterized by the position of the
is
perianth versus ovary, shape of the spur and lip form, perianth
i.e.,
segments perpendicularly on the ovary apex; nectar spur
set is
on
saccate with narrow, projection apex; basal au-
finger-like lip
and
ricles are fleshy, thick, connate with thick claw equal in length
with and very Hypochile
the small, triangular fleshy epichile.
is
obovate
to cordate.
Pelexia cundinamarcae a terrestrial plant, found in dense,
is
Hp
moist and
Sepals petals are green, greenish.
forest. is
PELEXIA
ASINUS,
(Figure
nov, 2)
sp.
Pelexiae novofriburgensi sed floribus apice plus
affinis, strictis,
minusve
n;^tpntibn<i nedirello loneo. erecto. calcari coniformi.
camosis
ovato-rhomboidali
verse duplo hypochilio
ovali longioribus
et
recedit.
mm
mm
ly pendulous upper above the leaves sparsely
in part, delicate,
Cauline bract
glandular, densely glandular along inflorescence axis.
single, narrow, acute, short, herbaceous, sparsely glandular at base.
Rhodora
95
[Vol.
280
E
E
SCHNEIDER
679/2
1mm
a— b— c—
dorsal
Figure 2. Pelexia asinus Szlach.: flower with floral bract; lip;
d— e—
sepal; petal; free portion of lateral sepal; f— rostellum remnant.
Leaves forming and on stem
a basal rosette 2 the
5,
mm
mm mm
25-28
lone,
asymmetric
mm
Flowers
subsecund.
long, lO-flowered, lax,
narrow bracts
^d. with sliehtlv falcate snur. Floral
—
1993] Szlachetko Pelexia
281
1
b—
a—
Figure 3. Pelexia sinuosa Szlach.: flower and floral bract; dorsal sepal;
c— d—
e—
petal;
lateral sepal; lip.
Rhodora
282
95
[Vol.
mm
24 long, ovate-lanceolate, subacute, herbaceous, thin, glan-
mm mm
5-7 Ovary
dular outside. Pedicel about long, twisted. 16
mm
long, narrow, densely glandular. Dorsal sepal 16.5 long, 5
mm
wide, oblong, widest and concave in the middle, obtuse,
rather fleshy, densely glandular outside in the basal half. Free part
mm mm
more
of lateral sepals 20 long, 4 wide, or less erect,
lanceolate, acute, fleshy, densely glandular outside in the basal
mm mm
half. Petals 16.5 long, 3.5 wide, falcate-oblanceolate,
%
obtuse, single-nerved, glandular up to on outer margins. Lip
straight with the apex bent forward, clawed; basal auricles 6
lip
mm mm
long, wide, almost completely connate with the claw,
,6
1
mm
portion about very hypochile 10
free long, thick, fleshy;
1
mm mm
long, 8 wide, obovate, thickened along midnerve, mar-
mm
gins thin, agglutinate to the clinandrium; epichile 3 long, 4.8
mm mm
Gynostemium
wide, obtuse, 12
elliptic, fleshy, papillate.
mm,
column
long, erect; foot adnate to the ovary along 7 with
mm mm
remnant broad
free 2.5 apical part; rostellum 2 long, at
mm
anther 4
base; long.
COLOMBIA,
Cundinamarca— mas
Type: Dept. Rio Sabaneta,
abajo de El Dintel, 2200 m. Schneider 679/2, 13 June 1953
ETYMOLOGY:
(holotype: col). acinus (Lat.)— donkey; an al-
lusion to the general outline of the which suggests the head
lip,
of
animal.
this
At
first glance Pelexia asinus seems to be similar to P. novofri-
burgensis (Reichenb. f Garay, but easy to distinguish by the
) it is
erect flowers, set on the long and erect pedicel, narrow conical-
very which
are about twice the size of the elliptic epichile. Hypochile is ob-
ovate.
PELEXIA
SINUOSA,
nov. (Figure
sp. 3)
Habitu
Pelexiae funckianae multis,
similis, sed vaginis caulinis
floribus majoribus et inflorescentia densa Bracteae longae,
differt.
intus glandulosae. Labellum
basi aneulato-flexuosum, olico cras-
camoso
mm mm
Stem 370 5-7
tail,
mm
2-3
at base, In diameter below rather
inflorescence, erect,
stout, glandular in upper completely covered by cauline bracts.
half,
Cauline
bracts 6-12, longer than intemodes, reach the inflores-
Szlachetko— P^/^x/^ 283
1993]
cence, lanceolate, spacious, acute, herbaceous, uppermost glan-
forming
90
8-40
mm
lanceolate, acute, seems to be fleshy. Inflorescence 130-180
15-2 5
long, -flowered, dense. Flowers very with
large, suberect,
mm
34-43
saccate spur. Floral bracts long, lanceolate oblong-
to
lanceolate, acute, thin, herbaceous, glandular outside. Pedicel 5
mm
mm
Ovary 18-23
long, twisted. long, narrow, almost
erect,
mm mm
28-30
glandular. Dorsal sepal long, 5.5-6.5 wide, ob-
long-lanceolate, subacute, thin, delicate, concave at apex, densely
mm mm
glandular outside. Lateral sepals 34-35 long, 4-4.5 wide,
mm
28-30
falcate-lanceolate, acute, thin, glandular outside. Petals
mm
on Lip
tipper, acute to obtuse, thin, glandular outer margins. set
on long and narrow from
claw, basal auricles partially free
lip
mm mm
when
claw 4,7-5 wide thickened
(2.3-2.8 spread,
long),
between
at apices, ciliate outside; auricles fleshy, papillate ridge,
mm
28-30
lip stronelv S-incurved above the ridge: hvpochile
mm
sometimes
mm mm
fused with column; 4-5 6-6.5 wide,
the epichile long,
cordate, obtuse, thicker than hypochile, bent forward
papillate,
mm
Gynostemium 21-25
in natural position. long, slender, erect;
mm,
column foot adnates to the ovary along 8,5-10 with free
mm mm
3^
apex membraneous,
4
long; rostellum long, delicate;
mm
mm
remnant
viscidium 1-1.5 long; rostellum 3 long; anther
mm mm
6 long; pollinarium 7.2-8 long.
COLOMBIA,
Type: Dent, del Choco-kilometro 55 de la carre-
Ansermanuevo 1950 m, Terres-
.
Flores verdes.
la
March col
19 1980 (holotype: 200472).
COLOMBIA, du San
Paratype: Dept. de Bolivar— requon rio
Jorge. Claes
32, sine dat.
(p).
ETYMOLOGY:
sinuosa (Lat.)-sinous; in reference to the
curvature
funckiana
&
Rich. Gal.) Schlecht., but the flowers are almost twice as large
and
as in the They are arranged in multiflowered
last species.
dense numerous and longer than
inflorescence, Cauline bracts are
Very
intemodes coverine whole stem completely. long floral
the
Rhodora
284
[Vol. 95
bracts are glandular outside. But the most characteristic feature
of P. sinuosa is S-formed lip bending in the anterior portion with
between
fleshy, thick ridge basal lip auricles.
ACKNOWLEDGMENTS
am
grateful to Prof, dr hab. Ryszard Ochyra for latinization
I
of the diagnoses, and to the Curators of col and for the loan of
s
herbarium and
materials Curator of p for the hospitality during
my
personal
visit.
LITERATURE
CITED
A
Garay,
L. a. 1982. generic revision of the Sprianlhinae. Bot. Mus. Leafl
Harv. Univ. 278-425.
28(4):
DEPARTMENT OF PLANT ECOLOGY AND NATURE PROTECTION
GDANSK
UNIVERSITY OF
LEGIONOW
AL.
9
GDANSK, POLAND
PL
80-441