Lathyrus turcicus (Fabeae, Fabaceae), a new species from Northwestern Türkiye
Author
Hamzaoğlu, Ergin
text
Phytotaxa
2023
2023-05-19
598
1
105
110
http://dx.doi.org/10.11646/phytotaxa.598.1.9
journal article
10.11646/phytotaxa.598.1.9
c998311e-44c3-48f6-b790-2a2a4e87d31b
1179-3163
7958858
Lathyrus turcicus
Hamzaoğlu
,
sp. nov.
(
Figs. 1
and
2
,
Table 1
).
Type:—
TÜRKİYE
.
Bursa
:
Büyükorhan
, west of
Durhasan village
, near dam, forest clearings, rocky slopes,
900 m
a.s.l.
,
31 August 2022
,
E
.
Hamzaoğlu 8048
(
holotype
GAZI
!,
isotypes
GAZI
!,
ANK
!,
HUB
!)
.
Diagnosis
:—
Lathyrus turcicus
is related to
L. pallescens
(1841: 723) It differs from
L. pallescens
, mainly by stipules shorter than petiole (not longer than petiole); the calyces are glabrous (not hairy); the calyx teeth subequal (not unequal); the standards and wings are almost equal and
13.2–15.3 mm
long (not
20–24 mm
); the keels
11–13 mm
long (not
16–18 mm
) and the legumes
7–9 mm
wide (not
3–5 mm
).
Description
:—Erect to ascending, glabrous, perennial with ramified rhizomes. Stems not winged, angled, ribbed,
25–50 cm
. Leaves pinnate, with
5–7 mm
petiolate and
2–4 mm
aristate; leaflets subopposite to opposite, 5-parallel-veined from base; leaflets on lower leaves 2–3-paired, linear, 25–80 ×
3–5 mm
; leaflets on middle leaves 2–3-paired, linear, 20–60 ×
1.5–3.5 mm
; leaflets on upper leaves 1–2-paired, linear, 15–50 ×
0.8–1.7 mm
; stipules semi-sagittate, subulate, shorter than petiole. Peduncles
16–42 mm
, as long as or longer than leaves, laxly 3–8-flowered; pedicels
2–5 mm
. Calyx
5.7–7.2 mm
, glabrous; tube gibbosus,
3.5–5 mm
long, 5-veined; teeth subequal,
1.5–2.1 mm
long, shorter than tube, broadly triangular, ciliate, with scarious margins. Corolla cream, pale sulphur to greenish yellow; standard
13.2–15.3 mm
long, lamina 8.1–8.8 ×
10–12.5 mm
, obovate-trilobate, emarginate, with two gibbous in middle, claw 5.1–6.5 ×
5.5–7 mm
; wing
13.2–15 mm
long, lamina 8–10 ×
4.6–5.2 mm
, 5–6 ×
1.1–1.5 mm
; keel
11–13 mm
long, with a rostrate apex, lamina 6–8 ×
3.5–5 mm
, claw 5–6 ×
1.2–1.5 mm
. Stamens
10–12 mm
, connate for
7–8 mm
. Anthers
0.8–1.1 mm
. Ovary glabrous; stylus spathulate at apex, 4–6 ×
1.1–1.4 mm
, bearded surface
3–4 mm
. Legume linear-oblong, 45–60 ×
7–9 mm
, glabrous, reticulate, straw-colored. Ovules 8–12; seeds 3–5, subquadrangular, 3.5–5 ×
3–4 mm
, brownish, smooth, hilum ca.
2 mm
long.
Distribution and habitat
:—Specimens of
Lathyrus turcicus
were collected from W of Durhasan Village (
Bursa
,
Türkiye
). It is estimated that the
variety grows
in rocky slopes in degraded oak forest openings, approximately between 900 and
950 m
a.s.l. There are many degraded forests and rocky slopes around Durhasan Village and Büyükorhan District. The probability that the taxon is also grown in this places is rather high, but there is still no data about this. Consequently, at present, the taxon is an endemic of
Türkiye
and when the area of distribution is considered, it is in the transition zone of Mediterranean and Euro-Siberian phytogeographic regions (
Figure 3
).
Phenology
:—Flowering time August‒September, fruiting time September‒October.
Etymology and Turkish name
:—The species is named after the country of
Türkiye
. “
Türk
burçağı” was suggested as the Turkish name for the new species.
Conservation status
:—According to the existing data,
Lathyrus turcicus
is a species only known from the
type
locality. Approximately 100 individuals were counted in the
type
locality. The taxon grows forest clearings (oak) and rocky slopes in W of Durhasan Village. There are agricultural areas and an irrigation dam in the close surroundings of the individuals belonging to the taxon. On the other hand, there is a very low probability of these areas becoming completely agricultural lands in the future. When the areas where the taxon could be grown are considered, it is estimated that
L. turcicus
showed a distribution on an area smaller than
100 km
2
. When the existing or envisaged threats are evaluated together, the taxon being known from only one address at present (area of life less than
10 km
2
) and the breadth of the area of distribution calculated (less than
100 km
2
), it was decided that it would be suitable to propose the Critically Endangered [CR B1ab(i)+CR B2b(ii)] classification for the extinction risk of the taxon (
IUCN Standards and Petitions Committee 2023
).
Specimens examined
:—
Lathyrus pallescens
:
TÜRKİYE
.
Ardahan
:
Göle
, plateau of
Karlıyazı village
, around
Kartaltepe
,
10 July 1981
,
N
.
Demirkuş
1066
(
HUB
!);
between
Ardahan
and
Kartaltepe
, along the road,
15 July 1981
,
N
.
Demirkuş
1131
HUB
!);
Kars
:
Yağmurlu Dağı
,
between Karaurgan and Sarıkamış
,
2200 m
a.s.l.
,
13 June 1957
,
P
.
H
.
Davis
29483 &
I
.
C
.
Hedge
(
E
,
E00370297
, virtual image!;
ANK
!);
Yağmurlu Dağ
, above
Karaurgan
,
2100 m
a.s.l.
,
23 August 1957
,
P
.
H
.
Davis
32608 &
I
.
C
.
Hedge
(
E
,
E00370296
, virtual image!;
ANK
!);
Kısır Dağı
,
2200 m
a.s.l.
,
30 June 1957
,
P
.
H
.
Davis
30447 &
I
.
C
.
Hedge
(
E
,
E00370294
, virtual image!;
ANK
!);
between
Kars
and
Susuz
,
1800 m
a.s.l.
,
15 June 1957
,
P
.
H
.
Davis
29579 &
I
.
C
.
Hedge
(
E
,
E00287613
, virtual image!;
ANK
!);
Sarıkamış
,
2100 m
a.s.l.
,
07 July 1957
,
P
.
H
.
Davis
30798 &
I
.
C
.
Hedge
(
E
,
E00370295
, virtual image!;
ANK
!);
Sarıkamış
–
Karakurt
road, Keklikderesi place, pine clearings,
1800–1900 m
a.s.l.
,
20 June 1979
,
O
.
Güneş
1257
(
HUB
!);
Kağızman
,
Denizgölü village
,
Mantardüzlüğü
place,
2000 m
a.s.l.
,
16 June 1980
,
O
.
Güneş
1663
(
HUB
!)
;
Ağrı
: Kars road,
N
. of
Ararat
[Ağrı Mountain],
1900 m
a.s.l.
,
23 June 1971
,
Brown
572
(
E
,
E00158118
, virtual image!)
;
2 km
SW of Hamur
(
Murat valley
),
1670 m
a.s.l.
,
01 June 1976
,
Davis
44060
(
E
,
E00370300
, virtual image!)
.
FIGURE 1
.
Lathyrus turcicus
. A: habit (holotype), B: flower, C: legume.
FIGURE 2
. The flower parts of
Lathyrus turcicus
. A: calyx, B: standard, C: wings, D: keel, E: stamens and ovary, F: seed (scale bar: 3 mm).
FIGURE 3
. Distribution map of
Lathyrus turcicus
(★) and
L. pallascens
(■).
The first comprehensive information in
Türkiye
about the genus
Lathyrus
and section
Platystylis
was included in Volume 3 of the work titled “
Flora of
Turkey
and the East Aegean I
slands”. The general characteristics of the species belonging to the sect.
Platystylis
are as follows; perennial, erect to ascending, stem angled; leaves pinnate to subdigitate, leaflets 1–7-paired, oblog to linear, parallel-veined from base, stipules semi-sagittate; inflorescences few or several-flowered; styles not or rarely twisted, linear to broadly spathulate; legumes not stipitate and gland dotted, seed rough or sooth and hilum relaively long (
Davis 1970
,
Rechinger 1979
).
Lathyrus pallascens
is one of the 15 species of the section known from
Türkiye
(
Davis 1970
,
1988
,
Güneş & Sesal 2010
). This species grows in N. Balkans,
Hungary
,
Romania
, C. & S.
Russia
, Crimea, Transcaucasia and N.E.
Türkiye
(especially in
Kars Province
) between 1800–2200 meters. The flowering period of the species is June-July and it prefers high mountain steppes, meadows and rocky slopes as habitat.
The moment the
Lathyrus turcicus
was seen for the first time, the most interesting aspect was that it was small flowers and large fruits.
Lathyrus turcicus
is similar to
L. pallascens
in terms of shape and size of leaves and seeds, and color of petals. However, in the
L. turcicus
specimens, there are stipules shorter than petiole, glabrous calyces, short petals and wider legumes (
Table 1
,
Figs. 1
and
2
).