Synopsis of the genus Drosera (Droseraceae) in Angola and the Democratic Republic of the Congo
Author
Rjosk, A.
epartment of Biology, Institute of Botany, Faculty of Science, Technische Universität Dresden, 01062 Dresden, Germany
annabell.rjosk@tu-dresden.de
Author
Neinhuis, C.
epartment of Biology, Institute of Botany, Faculty of Science, Technische Universität Dresden, 01062 Dresden, Germany
Author
Monizi, M.
University of Kimpa Vita, Province of Uíge, Rua Henrique Freitas No. 1, Bairro Popular, Uíge, Angola
Author
Lautenschläger, T.
epartment of Biology, Institute of Botany, Faculty of Science, Technische Universität Dresden, 01062 Dresden, Germany
text
Blumea - Biodiversity, Evolution and Biogeography of Plants
2022
2022-06-30
67
1
1
14
http://dx.doi.org/10.3767/blumea.2022.67.01.03
journal article
10.3767/blumea.2022.67.01.03
7679465
2.
Drosera bequaertii
Taton
—
Fig. 4
Drosera bequaertii
Taton (1945a)
308;G.C.C.
Gilbert (1951)
553;J.R.
Laundon (1970)
27; (1978) 64; A.S.Rob. et al. (2017) 1334.
—
Type
:
J. Bequaert 476
(holo BR),
DRC
,
8 June 1912
.
Drosera compacta
Exell & J.R.Laundon (1955a)
44. —
Type
:
A.W. Exell & F.A. Mendon ҫa 1030
(holo COI),
Angola
,
Lunda Sul
, Rio Luachimo, entre Sila Henrique de Carvalho e Dala, ‘Tenga’,
24 Apr. 1937
.
Perennial herb, shortly caulescent.
Stems
3–4 (up to 7) cm long,
1–2.5 mm
diam, densely pilose (
Fig. 4b
).
Leaves
alternate, clustered at the apex and erect, basally more widely spaced and more or less reflexed; stipules
2–4.5 mm
long, membra- nous, ferrugineous, lacerated at the apex; lamina obovate to spathulate, 4–12 by
3–6 mm
, the adaxial surface and margins bearing tentacles, abaxially pilose (
Fig. 4a
); petiole 5–12 by
0.5–1 mm
, flat, densely pilose.
Inflorescence
cymose, with 2–8 flowers; peduncles 1 or 2 together,
10–17 cm
long, completely erect, basally glandular and pilose to densely pilose, apically glandular; bracts almost linear,
2–3 mm
long, glandular or pi- lose; pedicels
2–7 mm
long, glandular.
Sepals
5, lanceolate to ovate, 3–4.5 by
1.5–2 mm
, connate at the base, occasionally apex serrate, glandular.
Petals
5, obovate, 5–7 by c.
4 mm
, bright pink.
Stamens
5, filaments
3–4 mm
long.
Pistil
: ovary subglobose,
2–3 mm
diam, glabrous; styles 3, c.
2 mm
long, bipartite to the base, branches ascending, with broadened apices.
Seeds
suborbicular to ovoid, c. 0.3 by
0.2 mm
(
Fig. 4e
), black, shining, testa smooth.
Distribution —
Angola
,
DRC
,
Zambia
(
Fig. 4c
).
Habitat & Ecology — Grassy wetlands, upland plateaus.
Additional specimens
(see
Fig. 4d
for province map).
ANGOLA
,
Moxico
, Cameia National Park, Biodiversity Observatory,
S11°31'
E20°55'
, alt.
1126 m
,
3 May 2016
,
M.Finckh & Zigelski 143303
(
HBG
)
. –
DRC
,
Haut-Katanga
, Cuv. de Kabiashia, rivière Kandale, alt.
1000 m
,
24 June 1968
,
J. Leonard 4617
(
BR
)
.
Note —
Drosera compacta
is widely accepted as a synonym of
D. bequaertii
. Both
type
specimens show many similarities but differ in leaf arrangement (densely vs more openly arranged) and scape indumentum (basally densely pilose vs glandular and pilose). Since this species is only infrequently documented (
Robinson et al. 2017
) and only few specimens were studied, no comment can be made on separating both taxa. Here, a more detailed analysis is required.