A synopsis of the Sabicea floribunda group (Rubiaceae) from Central Africa, including three new species
Author
Lachenaud, Olivier
Meise Botanic Garden, Nieuwelaan 38, 1860 Meise and Herbarium et Bibliothèque de Botanique africaine, CP 265, Université Libre de Bruxelles, Boulevard du Triomphe, B- 1050 Brussels, Belgium.
olivier.lachenaud@botanicgardenmeise.be
Author
Zemagho, Lise
Plant Systematics and Ecology Laboratory, Higher Teacher’s Training College, University of Yaoundé I, P. O. Box 047, Yaoundé, Cameroon.
Author
Sonké, Bonaventure
Plant Systematics and Ecology Laboratory, Higher Teacher’s Training College, University of Yaoundé I, P. O. Box 047, Yaoundé, Cameroon; International Joint Laboratory DYCOFAC, IRD-UYI-IRGM, BP 1857, Yaoundé, Cameroon.
text
Candollea
2020
2020-06-17
75
1
115
143
journal article
20342
10.15553/c2020v751a12
5dc555f1-fb4e-4caf-acce-c1ec7dc90492
2235-3658
5724782
8.
Sabicea segregata
Hiern
in
Oliv., Fl. Trop. Afr. 3: 77. 1877
(
Fig. 2G–H
,
13C–F
).
≡
Pseudosabicea segregata
(Hiern) N. Hallé
in Adansonia ser. 2, 3: 172. 1963.
Lectotypus
(designated here):
GABON
or
EQUATORIAL GUINEA:
River Muni
,
VIII. 1862
,
Mann
1766
(
K
[
K000414626
]!;
isolectotype
:
P
[
P00077599
]!).
=
Sabicea henningsiana
Büttner
in Bot. Vereins Prov. Brandenburg 31: 79. 1889
.
Lectotypus
(designated here):
GABON
.
Estuaire
:
Sibangefarm
,
IX.1884
, fl.,
Büttner
437
(
K
!).
Syntypus
:
GABON
.
Estuaire
:
Sibangefarm
,
X.1884
,
Büttner
443
(
B
†).
Distribution, ecology and phenology
. – This species occurs in southern
Cameroon
where rare,
Equatorial Guinea
(
Rio Muni
),
Gabon
where very common and widespread (though absent in southeast, extreme northeast, and lower Ogooué basin), and southwestern
Republic of Congo
(
Fig. 14
). It is found in secondary forest, edges and regrowth, and in fringing forest on inselbergs, always on drained soils, on various substrates (sandy or clayish),
0–1080 m
in altitude.
Flowers and fruits have been recorded in all months.
Conservation status
. – The extent of occurrence (EOO) of
S. segregata
is estimated to be
250,602 km
², and its area of occupancy (AOO) to be
396 km
². The latter value falls within the limit for “Vulnerable” status under criterion B2, but is an obvious underestimation given the low collecting density in most of its range and the fact that the species is generally common there. The species occurs from south
Cameroon
to the
Republic of Congo
, and is known from
124 specimens
representing 71 subpopulations. It occurs in several protected areas: Campo Ma’an National Park in
Cameroon
, Monte Alén National Park in
Equatorial Guinea
, Lopé, Waka, Doudou Mountains and Ivindo National Parks in
Gabon
, and Dimonika Biosphere Reserve in the
Republic of Congo
. In view of its wide distribution, abundance, and preference for degraded forest habitats, it is here assessed as “Least Concern” [LC] using the IUCN Red List Categories and Criteria (
IUCN, 2012
).
Notes
. – This species is closely related to
S. floribunda
, both having the corolla lobes brown at anthesis, unlike other species of the group. The differences between them are summarised in the key. The calyx lobes of
S. segregata
are usually longer and narrower than in other species of the group, but there is limited overlap with
S. floribunda
in this character.
Most collections of
S. segregata
, including the
type
, have stems with appressed hairs, but a variant with hirsute stems occurs in
Gabon
, particularly in the east of the country. The fruits apparently turn from whitish to red to purple-black; however, since the last colour is much less commonly reported than the other two, it is not sure whether this sequence is always followed.
The original description of
S. segregata
(
HIERN, 1877
)
does not mention the type number, but the only possible candidates are
Mann
1766
in Kew, and
Mann s.n.
in Paris, the latter being almost certainly an unnumbered duplicate of the former. The Kew sheet is here selected as
lectotype
. It is not known on which side of the Muni River, which forms the border between
Equatorial Guinea
and
Gabon
, this material was collected.
The description of
S. henningsiana
(
BÜTTNER, 1889
)
is based on
two syntypes
,
Büttner 437
and
Büttner 443
, both from Sibang in
Gabon
. The original sheets of both specimens have presumably been destroyed in Berlin, but a duplicate of the former remains in Kew, and is here selected as
lectotype
.
Fig. 14. –
Distribution map of
Sabicea segregata
R.D. Good.
Additional material studied
. –
CAMEROON
.
Reg. South
:
Campo-Ma’an area
,
Ebodje
,
Along the beach
,
20.II.2000
, fr.,
Elad et al
. 1367
(
WAG
);
Campo-Ma’an area
,
Mvini
,
Bigan
,
Along Trasect
7,
16.II.2000
, imm.fr.,
Tchouto Mbatchou et al.
2524
(
WAG
);
Bipindi
, s.d., buds,
Zenker
s.n.
(
BR
,
P
).
EQUATORIAL GUINEA
.
Centro-Sur
:
Parc National de Monte Alen
,
dalle rocheuse d’Engong
,
5 km
à l’W du village d’Engong
,
12.V.2002
, fr.,
Parmentier
&
Esono
2781
(
BRLU
);
4 km
N de Mitong
,
12.XII.2003
, imm.fr.,
Sonké
3138
(
BR
,
BRLU
,
K
);
6 km
N de Mitong
,
12.XII.2003
, fl.,
Sonké
3151
(
BR
,
BRLU
,
K
);
Engong
,
14.VIII.2001
, fl.,
Sonké
&
Esono
2546
(
BR
,
BRLU
,
WAG
);
Engong
,
14.VIII.2001
, fr.,
Sonké
&
Esono
2552
(
BR
,
BRLU
,
WAG
).
Litoral
:
Bata-Monson-Dibolo
:
Estrada kms 54–
55
,
15.X.1991
, fl.,
Carvalho
4889
(
BR
,
BRLU
,
WAG
);
Bata-Nasanga
:
Estrada km
14
,
17.X.1991
, fl.,
Carvalho
4890
(
WAG
);
Bata-Mari
:
Estrada kms 62–
63
,
15.XI.1991
, imm.fr.,
Carvalho
4952
(
WAG
);
Engong
,
28.VII.1999
, fr.,
Eneme
439
(
BRLU
);
Etembue
,
15.IX.2001
, buds,
Esono
&
Ndong
335
(
BRLU
);
Ndote Nord
,
28.VIII.1997
, fr.,
Lisowski
M-153
(
BRLU
).
Reg. unknown:
Akanabot
,
15.IX.2001
, fr.,
Esono
&
Ndong
351
(
BRLU
).
GABON
.
Estuaire
:
Mondah Forest on Cape Esterias
, c.
22 km
on the road from Libreville
,
3.IX.1978
, fl. & fr.,
F.J. Breteler et al
. 408
(
BR
,
K
,
WAG
);
plantations de Assoukou
,
près du poste de Kango
,
2.X.1912
, buds,
Chevalier
26847
(
K
,
P
);
plantation Stéphane
,
sur la Bokoué
,
9.X.1912
, fl.,
Chevalier
26989
(
P
);
vieux chantier ‘Sango’
,
Ntoum
,
9.X.1987
, fl.,
Dibata
320
(
BR
,
WAG
);
Nkoulounga
,
31.I.1961
, fl.,
N. Hallé
1024
(
P
);
sine loco,
15.X.1896
, fl.,
Klaine
100
(
P
);
sine loco,
12.IX.1896
, fl.,
Klaine
123
(
P
);
Env. de Libreville
,
18.VIII.1898
, fl. & fr.,
Klaine
377
(
P
);
env. de Libreville
, 1897, fr.,
Klaine
771
(
P
);
Env. de Libreville
,
15.VI.1897
, fr.,
Klaine
962
(
P
);
env. de Libreville
,
5.X.1901
, fl. & fr.,
Klaine
2432
(
BR
,
K
,
P
);
km 31 Kougouleu-Atogafina
,
NE of Kouamé
,
19.XI.1982
, imm.fr.,
Leeuwenberg
12554
(
LBV
,
WAG
);
rte Cap Santa-Clara
,
6 km
à droite
,
31.I.1985
, fr.,
A.M. Louis
&
J.M. Reitsma
1677
(
BR
,
LBV
,
WAG
);
Forêt Classée de la Mondah
,
0°32'48"N
9°19'40"E
,
20.II.1994
, fr.,
Lowry
4566
(
LBV
);
c.
15 km
N. of Libreville
,
18.III.1987
, fr.,
J.M.
&
B. Reitsma
3166
(
LBV
,
WAG
);
forêt de la Mondah
.
5 km
on off road to Santa Clara from Cap Esterias road
,
11.XI.1988
, fl.,
van der Maesen et al
. 5440
(
WAG
).
Haut-Ogooué
:
concession CEB,
W of Okandja
,
19.XI.2015
, imm. fr.,
Texier
&
Akouangou
174
(
BRLU
).
Moyen-Ogooué
:
Mabounié
, à
45 km
au SW de Lambaréné
,
rives de la Ngounié
,
15.X.2012
, fl.,
Bidault et al
. 845
(
BRLU
,
LBV
,
P
);
ibid. loco,
16.X.2012
, buds,
Bidault et al
. 906
(
BRLU
,
LBV
);
ibid. loco
,
15.XI.2013
, fl.,
Bidault et al
. 1316
(
MO
);
au S de Lambaréné
,
entre 5 et
10 km
depuis la ville
,
entre l’Ogooué et la rte de Fougamou
,
13.IV.2015
, fr.,
Bidault et al
. 1922
(
BR
,
BRLU
);
Concession forestière GWT
(
Global Wood and Trading
),
5.VI.2012
, imm.fr.,
Boupoya
& al. 744
(
BRLU
);
Mboumi
,
16.I.2000
, fr.,
Champluvier
6008
(
BR
);
ibid. loco
,
16.I.2000
, fr.,
Champluvier
6019B
(
BR
);
c.
10 km
NNW of Ndjolé
,
on BSO forestry road
,
26.II.2008
, fl.,
Dessein et al
. 2148
(
BR
,
LBV
,
MO
,
WAG
);
Ayem
,
10 km
SW de Ndjolé
,
11.IV.1963
, fl.,
N. Hallé
1621
(
P
);
Ayem
,
10 km
SW de Ndjolé
,
30.IV.1963
, fl. & fr.,
N. Hallé
1952
(
P
);
Ayem
,
10 km
SW de Ndjolé
,
6.V.1963
, fl.,
N. Hallé
2007
(
P
);
N of lake Azingo
,
4.VI.2014
, imm.fr.,
Libalah
&
Ikabanga
3
(
BR
,
BRLU
);
Mabounié
,
18.X.2012
, fl.,
Sonké
et al. 6108
(
BR
,
BRLU
);
ibid. loco
,
23.X.2012
, fl.,
Sonké
&
Ikabanga
6127
(
BR
,
BRLU
);
ibid. loco
,
23.X.2012
, fl.,
Sonké
&
Ikabanga
6137
(
BR
,
BRLU
);
ibid. loco
,
23.X.2012
, fl. & fr.,
Sonké
&
Ikabanga
6139
(
BR
,
BRLU
,
P
);
Rougier Logging Concession
,
Haut Abanga. East of Ndjolé
,
17.II.2012
, fr.,
Stévart et al
. 4301
(
BRLU
,
LBV
,
P
);
Ndjolé
,
I.1895
, fr.,
Thollon
117
(
P
);
roadside between Ndjole town and railway station
,
22.VII.1986
, fr.,
Thomas
&
Wilks
6589
(
LBV
,
P
,
WAG
).
Ngounié
:
Waka forest exploitation road
,
19.XI.1984
, fl.,
Arends et al.
301
(
BR
,
K
,
LBV
,
P
,
WAG
);
PN de Waka
,
1°10'34"S
11°08'02"E
,
28.XI.2007
, imm.fr.,
Boussengui-Nongo et al
. 313
(
LBV
);
Mouyanama falls
,
at base of Mt Songou
,
22.II.2008
, fr.,
Dessein et al
. 2041
(
BR
,
LBV
);
entre Pagha & Mouteti
,
26.XI.1924
, fl.,
Le Testu
5104
(
BM
,
BR
,
K
,
P
,
WAG
);
Parc national de Waka
,
près du Camp Oghoubi
,
24.VI.2006
, fr.,
J. Mayombo et al
. 1559
(
LBV
);
25 km
on the road Ikobey to Egoubi camp
,
1.IV.2004
, fr.,
Wieringa et al.
5204
(
LBV
,
WAG
);
road Mouila to Yeno
, c.
2 km
before Issinga
,
8.III.2013
, fr.,
Wieringa et al.
7169
(
WAG
).
Nyanga
:
rte Tchibanga-Ndende
,
25.X.2009
, fl.,
Bissiengou et
al. 540
(
BR
,
LBV
,
WAG
);
48 km
SSW of Doussala
,
road Doussala-Igotshi
,
21.III.1988
, fr.,
J.J.F.E. de Wilde et al
. 9485
(
BR
,
K
,
LBV
,
WAG
);
Tchibanga
,
IX.1915
, fl.,
Le Testu
2120
(
BM
,
BR
,
K
,
P
);
concession SFN
,
30.X.2003
, fl. & imm.fr.,
van Valkenburg et al.
2523
(
BR
,
K
,
LBV
,
P
,
WAG
);
forestry concession of Bakker
,
6 km
N of Igotchi
,
29.X.2003
, fl.,
Wieringa et al.
5025
(
BR
,
K
,
LBV
,
WAG
);
forestry concession of Bakker
,
15 km
NNE of Igotchi
,
31.X.2003
, fl.,
Wieringa et al.
5047
(
LBV
,
WAG
).
Ogooué-Ivindo
:
concession forestière Rougier-Ivindo
.
En bordure du fleuve
,
au N de la concession
,
29.X.2015
, fl.,
Bidault et al
. 2269
(
BR
);
Mintoume
,
5.II.2005
, fr.,
Boupoya
&
Mbazza
185
(
BRLU
);
station de recherche de Mpassa
,
10 km
S de Makokou
,
9.III.1984
, fl.,
Doumenge
191
(
LBV
,
P
);
M’passa
,
Ile aux chauve-souris
,
17.III.1977
, fr.,
Florence
55
(
LBV
,
P
);
M’passa
,
1.VI.1977
, fl.,
Florence
496
(
LBV
,
P
);
La Nké
,
ancienne zone d’exploitation
,
8.X.1983
, buds,
Floret et al
. 1732
(
WAG
);
piste du Bouéni
,
20 km
SE Makokou
,
11.II.1961
, fr.,
N. Hallé
1131
(
P
);
Makokou
,
Mission Catholique
,
16.II.1961
, imm.fr.,
N. Hallé
1185
(
P
);
±
50 km
SE Makokou
,
19.X.1964
, buds,
N. Hallé
2695
(
P
);
9 km
SSW of Makokou
,
near Ivindo R.
,
right bank
,
2.XI.1977
, fl.,
Leeuwenberg
11418
(
BR
,
K
,
WAG
);
Mintome
,
30.III.2003
, fr.,
Mboma et al
. 64
(
LBV
,
WAG
);
Ivindo National Park
,
rte Langoué
,
11.IV.2004
, fr.,
Moungazi
1557
(
BR
,
LBV
,
WAG
);
Ivindo National Park
,
Massouna 2000
,
0°08.90'S
12°27.10'E
,
6.XII.2003
, imm.fr.,
D. Nguema Ekomo
507
(
LBV
) &
508
(
LBV
);
bac de l’Ogooué
,
19.VIII.1983
, imm.fr.,
Sita
4964
(
LBV
);
Kongou waterfall area
,
00°17'25"N
012°34'22"E
,
8.II.2018
, imm.fr.,
Texier et al
. 2282
(
MO
);
Lopé
,
West Woods
,
26.X.1990
, buds,
L. White
172
(
LBV
);
Lope Reserve
,
15.X.1995
, buds,
L. White
1495
(
LBV
,
WAG
).
Ogooué-Lolo
:
Bambidie
, c.
30 km
E of Lastoursville
,
2.V.1992
, fl.,
F.J. Breteler et al
. 11248
(
LBV
,
WAG
);
Makande surroundings
, c.
65 km
SSW of Booué
,
2.II.1999
, imm.fr.,
F.J. Breteler et al
. 14892
(
WAG
);
Makandé
,
débardage Héron
,
20.XI.1993
, fl.,
Dhetchuvi et al
. 1372
(
BRLU
);
Vers
10 km
rte Makandé-Gongué
,
3.XII.1993
, fl. & imm.fr.,
Dhetchuvi et al
. 1597
(
BR
,
BRLU
,
K
,
WAG
);
Lastoursville
,
concession forestière CEB
,
30.XI.2012
, fl.,
Ikabanga
&
Haurez
343
(
BRLU
);
c.
50 km
SE of Achouka
,
old forest in Région des Abeilles
,
17.XI.1983
, fl.,
A.M. Louis et al.
756
(
BR
,
K
,
P
,
WAG
);
Camp Makande
,
16.XII.1993
, imm. fr.,
Moungazi
967
(
LBV
);
Camp concession SEEF
,
area of Mount Ngouadi
,
00°16'12"S
013°05'00"E
,
10.III.2017
, fr.,
Texier et al
. 707
(
LBV
,
MO
);
ibid. loco
,
00°17'20"S
013°10'40"E
,
11.III.2017
, fl.,
Texier et al
. 795
(
LBV
,
MO
);
ibid. loco
,
11.III.2017
, fr.,
Texier et al
. 798
(
LBV
,
MO
);
SIAEFG logging concession
,
30 km
N of Pana
,
01°28'44"S
12°32'55"E
,
9.XII.2017
, fl.,
Texier et al
. 1564
(
LBV
,
MO
);
S of Road Lopé-Lastoursville
, c.
60 km
,
00°43'21"S
012°28'30"E
,
18.XII.2017
, imm.fr.,
Texier et al
.1761
(
LBV
,
MO
).
Ogooué-Maritime
:
Toucan
,
12.X.2002
, fl.,
Bourobou et al
. 993
(
LBV
,
P
,
WAG
);
Rabi
, c.
1°55'S
9°52'E
,
13.X.2002
, fr.,
Bourobou et al
. 1022
(
LBV
);
Gamba
,
24.IX.1968
, buds,
Breteler
&
van Raalte
5675
(
BR
,
WAG
);
Foot of Doudou Mountains
,
25–35 km
W of Mandji
,
15.II.2008
, fr.,
Dessein et al
. 1862
(
BR
,
LBV
);
between Rabi and Echira
,
27.III.1990
, fr.,
F.J. Breteler et al
. 9557
(
LBV
,
WAG
);
Rabi-Kounga
,
near Rabi
44, 1.I.
1994, fr.,
Haegens
&
van der Burgt
226
(
LBV
,
WAG
);
Rabi-Kounga
,
15.X.1991
, fr.,
Schoenmaker
33
(
WAG
);
Pechoud road southwards
,
27.X.1990
, fl.,
van Nek
124
(
BR
,
LBV
,
WAG
);
Rabi
,
4½ km on road to Divangui
.,
4.III.1994
, fr.,
Wieringa
&
Haegens
2387
(
BR
,
LBV
,
WAG
).
Woleu-Ntem
:
c.
6 km
SSW of Mitzic
,
FOREENEX forest exploitation
,
6.XI.2009
, fl.,
Bissiengou
et al. 703
(
LBV
,
WAG
);
Parc des Monts de cristal
,
13.II.2010
, fl.,
Bissiengou
&
Niangadouma
975
(
LBV
,
WAG
);
between Zomoko and Saint Germain
, c.
10 km
SE of Mitzic
,
17.IV.1988
, fr.,
F.J.Breteler
&
Dibata
8771
(
BR
,
K
,
LBV
,
WAG
);
5–10 km
E of Saint Germain
,
E of Okano River
,
20.IV.1988
, fl.,
F.J. Breteler
&
Dibata
8866
(
BR
,
K
,
LBV
,
WAG
);
Mts de Cristal
,
inselberg Milobo
,
10km
N Mbé Akélayong
,
50km
W Medouneu
,
3.XII.2001
, fl.,
Degreef
254
(
BR
);
SEEG road near Tchimbélé
,
pylone 7
,
6.II.2008
, fr.,
Dessein et al
. 1723
(
BR
,
LBV
);
Angoum
,
VII.1933
, buds,
Le Testu
9199
(
BM
,
P
);
Along forestry road Oveng-Mitsic
,
28.III.1985
, fl.,
J.M. Reitsma
&
B. Reitsma
731
(
LBV
,
WAG
);
Tchimbélé Dam
,
Crystal Mountains
,
road N. of dam
.,
12.XI.2000
, fl.,
Walters et al
. 499
(
BR
,
LBV
,
WAG
).
REPUBLIC OF CONGO
.
Kouilou
:
rte de Dimonika à Pounga
,
24.XI.1978
, fr.,
Cusset
520
(
K
,
P
,
WAG
);
env. de Dimonika
,
M’Bulu Pambu
,
7.III.1980
, fr.,
Cusset
956
(
P
);
env. de Dimonika
,
après Makaba carrefour
,
13.XII.1982
, fr.,
Cusset
1173
(
P
);
Makaba
,
ancien village Manengue
,
17.II.1987
, fr.,
de Foresta
1296
(
P
);
rte de Sounda
(
Pointe-Noire
),
8.II.1966
, imm.fr.,
Farron
5024
(
P
);
near Koulila
,
6.XII.1990
, imm.fr.,
LaCroix
5005
(
K
);
Kakamoeka
,
11.X.1990
, buds,
Lisowski
B-8005
(
BR
,
K
,
WAG
);
en allant vers Makaba
,
village à
17 km
de Dimonika
,
4.XII.1972
, fr.,
Makany
2045
(
P
);
N’Tiétié
,
forêt à
3 km
du village
,
8.XII.1974
, fl.,
Sita
3807
(
BR
,
P
).
Niari
:
Mayombe au col de Bamba
,
8.XII.1990
, fl. & imm.fr.,
Dowsett-Lemaire
1392
(
BR
).