Taxonomic treatment of Abrahamia Randrian. & Lowry, a new genus of Anacardiaceae from Madagascar
Author
Randrianasolo, Armand
William L. Brown Center, Missouri Botanical Garden, P. O. Box 299, St. Louis, MO, 63166 - 0299, U. S. A.
armand.randrianasolo@mobot.org
Author
Lowry II, Porter P.
Africa and Madagascar Program, Missouri Botanical Garden, P. O. Box 299, St. Louis, MO, 63166 - 0299, U. S. A. & Institut de Systématique, Evolution, Biodiversité (ISYEB), UMR 7205, Centre national de la Recherche scientifique / Muséum national d’Histoire naturelle / École pratique des Hautes Etudes, Université Pierre et Marie Curie, Sorbonne Universités, C. P. 39, 57 rue Cuvier, 75231 Paris CEDEX 05, France.
Author
Schatz, George E.
Africa and Madagascar Program, Missouri Botanical Garden, P. O. Box 299, St. Louis, MO, 63166 - 0299, U. S. A.
text
Boissiera
2017
2017-12-27
71
1
152
journal article
53227
10.5281/zenodo.7618113
1649f36a-59e2-45e0-b539-690629481801
978-2-8277-0087-5
0373-2975
7618113
22.
Abrahamia minutifolia
Randrian. & Lowry
,
spec. nova
(
Fig. 20-21
).
–
Protorhus ditimena
var.
minutifolia
H. Perrier
in
Mém. Mus. Natl. Hist. Nat. 18: 261. 1944
[nom. inval.].
Typus
:
MADAGASCAR
.
Prov.Toamasina
:Rég.
Alaotra-Mangoro
,
Moramanga
,
Analamazaotra
RS, “carrière de
sable
”, [
18°56’S
48°26’E
],
900-950 m
,
29.X.1996
, fl.,
A. Randrianasolo
516
(holo-:
MO-
04895273
!;
iso-:
G
!,
K
!,
P
[
P06169142
]!,
TAN
[
TAN002000
]!)
.
Diagnosis
Abrahamia minutifolia Randrian. & Lowry
can be distinguished by having leaves that are smaller (1-3
3
0.9-1.8 cm
) than any other member of the genus and fruits that are among the smallest (1-1.5
3
0.5-0.8 cm
).
Description
Trees
3.5-12 m
tall,
11.9-40 cm
DBH, bark with translucid latex; young twigs waxy, lenticellate, with short, red, appressed indument at the tip.
Leaves
subopposite; blades, obovate, 1.8-4
3
0.9-1.8 cm
, subcoriaceous to coriaceous, apex emarginate, retuse, or rounded, margin entire, base acute, adaxial surface glabrous, abaxial surface with very sparse appressed reddish indument when young, glabrescent, venation craspedodromous, midvein prominent below, secondary veins 15-20 pairs,
0.5-2 mm
apart, prominent on both surfaces, tertiary veins raised on both surfaces; petiole
3-8 mm
long, canaliculate on adaxial surface, reddish pubescent when young, later glabrescent.
Inflorescence
axillary or terminal, a thyrse,
1-3 cm
long, axes somehow flattened, with ferruginous indument.
Male
and
female flowers
4- or 5-merous; pedicel
0.2-0.3 mm
long, pubescent; calyx lobes deltate, 1
3
1 mm
, imbricate, glabrous, persistent on fruit; corolla lobes ovate, 2-2.2
3
1-1.5 mm
, imbricate, adaxial surface glabrous, abaxial surface pubescent; stamens 4 or 5.
Male flowers
with filaments
1-1.5 mm
long, glabrous, white, anthers c.
0.8 mm
long, obloid to slightly ovoid, yellow, glabrous; disk cupuliform, c.
1 mm
in diam., glabrous; ovary rudimentary.
Female flowers
with filaments
0.3-0.5 mm
long, glabrous to slightly pubescent, white, anthers c.
0.5 mm
long, subglobose to ovoid, sterile, yellow, glabrous; disk c.
1.5 mm
in diam., glabrous; ovary widely to very widely ovoid, c. 1.5
3
1 mm
, pubescent, placentation subapical; style shortly trifid, subapically to apically inserted,
0.5 mm
long, partly pubescent, stigmas capitate.
Fruits
1-1.5
3
0.5-0.8 cm
, ellipsoid, slightly asymmetrical, surface velutinous, with longitudinal striations.
Distribution, ecology and phenology
Abrahamia minutifolia
has been collected primarily in premontane forest along Madagas-car’s eastern escarpment at an elevation of c.
900 m
and in central high elevation forest at c.
1500 m
, but it also occurs in humid forests in both the eastern and northwestern parts of the island (
Map 7
). It flowers between September and November, and fruits have been collected from November to April.
Fig. 20.
Abrahamia minutifolia
Randrian.& Lowry.
A.
FLowering branch;
B.
DetaiL of maLe flower;
C.
DetaiL of femaLe flower;
D.
Fruit showing indument;
E.
Cross section of fruit;
F.
Leaf (abaxiaL surface);
G.
Young infructescence.
Conservation status
With an EOO of
117,262 km
2
, a minimum AOO of
84 km
2
, and 21 known localities, with subpopulations in at least 5 protected areas (Ambohitantely, Kalabenono, Maso-ala, Manongarivo, and Analamazaotra-Perinet),
A. minutifolia
is assigned a preliminary conservation status of “Least Concern” [LC] using the IUCN Red List Categories and Criteria (
IUCN, 2012
).
Notes
Abrahamia minutifolia
is part of a group of species, along with
A. delphinensis
,
A. diti-mena
,
A. itremoensis
,
A. lenticellata
and
A. sericea
, that has velutinous fruits, but is distinguished by its thyrsiform (vs paniculate) inflorescence and smaller fruits (1-1.5
3
0.5-0.8 vs 2-3-2.5
3
1.2-1.4 cm
in
A. delphinensis
, 2-3
3
1.4-1.6 cm
in
A. ditimena
, 1.5-2.3
3
1.2-1.5 cm
in
A. itremoensis
, 2-2.6
3
1.3-1.5 cm
in
A. lenticellata
and 2-3
3
0.8-1.3 cm
in
A. sericea
).
The name
Protorhus ditimena
var.
minutifolia
, published by PERRIER DE LA BâTHIE (1944) on the basis of a fragmentary specimen
(Louvel 21),
is invalid because it lacked a Latin diagnosis, as required for all names published between
1 January 1935
and
31 December 2011
under Article 39.1 of the International Code of Nomenclature (
MCNEILL et al., 2012
). We have chosen to retain Perrier de la Bâthie’s epithet, which aptly characterizes this taxon, by formally describing it as a new species.
Paratypi
MADAGASCAR
.
Prov. Antananarivo
:
Ankazobe
,
Ambohitantely
RS,
18°11’S
47°17’E
,
1620 m
,
14.I.1997
, fl.,
Randrianaivo et al.
53
(
G
,
K
,
MO
,
NY
,
P
,
TAN
,
WAG
);
forest E of Anjozorobe
, E
Antsahabe village
, [
18°22’S
47°47’E
],
1400 m
,
22.X.1996
, fl.,
A. Randrianasolo
508
(
MO
,
P
,
TAN
);
Ambohitantely
RS,
18°10’42’’S
47°17’00’’E
,
1530 m
,
23-24.XI.1993
, fl.,
Schatz et al.
3565
(
G
,
K
,
MO
,
P
,
TAN
);
ibid. loco,
[
18°09’S
47°14’E
],
V.1953
, fr.,
Service Forestier
7361
(
P
,
TEF
);
ibid. loco
, [
18°08’S
47°16’E
],
1600 m
,
IV.1953
, fr.,
Service Forestier
8417
(
P
,
TEF
);
ibid. loco
,
26.VII.1954
, ster.,
Service Forestier
11-R-282
(
P
,
TEF
);
Poste forestier
Manankazo
,
Ankazobe
, [
18°09’S
47°14’E
],
22.VI.1955
, fr.,
Service Forestier
16814
(
P
,
TEF
).
Prov. Antsiranana
:
Ambanja
,
Bekolosy
,
14°02’S
48°18’E
,
1200 m
,
28.III.1996
, fr.,
Gautier
&
Be
2909
(
G
,
MO
,
P
,
TAN
,
TEF
);
ibid. loco,
14°02’S
48°18’E
,
1070 m
,
23.IX.1996
, fl.,
Gautier et al.
3123
(
G
,
MO
,
P
,
TAN
,
TEF
);
Ambilobe
,
forêt de Kalabenono
,
13°38’45’’S
48°40’45’’E
,
934 m
,
27.XI.2006
, fr.,
Callmander et al.
631
(
G
,
MO
);
Andapa
,
Doany
, forêt
d’Andramanalana
,
14°23’02’’S
49°21’36’’E
,
1280 m
,
IV.2006
, fr.,
Rakotovao et al.
3074
(
G
,
MO
,
P
,
TAN
);
Andramilolo
,
SE Anjanaha-ribe
,
14°19’43’’S
49°18’08’’E
,
1412 m
,
12.XI.2006
, fl.,
Razakamalala et al.
2939
(
G
,
MO
,
P
,
TAN
).
Prov. Fianarantsoa
:
Tolongoina
,
Andrambavato
,
2 km
S Tatamaly
,
21°30’S
47°24’E
,
1075 m
,
13.X.2000
, fl.,
Randriatafika
142
(
G
,
K
,
MO
,
P
,
TAN
).
Prov. Toamasina
:
Alaotra-Mangoro
,
Ambatovy
,
Analamay
,
18°48’28’’S
48°20’10’’E
,
1083 m
,
2.XII.2005
, fl.,
Antilahimena et al.
4316
(
G
,
MO
,
P
,
TAN
);
ibid. loco
, fl.,
Anti-lahimena et al.
4318
(
G
,
MO
,
P
,
TAN
);
Moramanga
,
Ambatovy
/
Andranovery forest
,
18°52’09’’S
48°18’15’’E
,
1013 m
,
26.X.2007
, fl.,
Antilahimena
5937
(
G
,
MO
,
P
,
TAN
);
Analamazaotra
,
IX.1925
, bud,
Louvel
21
(
P
);
Maroantsetra
,
Masoala
PN,
E slope of Ambohitsitondroinan’Mahalevona summit
,
15°25’34’’S
49°57’22’’E
,
1160 m
,
25.II.2003
, fr.,
Lowry et al.
6190
(
G
,
K
,
MO
,
P
,
TAN
,
WAG
);
along road to
Lakato
,
18 km
S of RN2
,
19°04’06’’S
48°22’01’’E
,
1050 m
,
17.X.2004
, fl.,
Lowry et al.
6547
(
G
,
MO
,
P
,
TAN
);
Ambatovy
,
Analamay
,
18°49’26’’S
48°20’16’’E
,
1000 m
,
26.I.1997
, fr.,
Rakotomalaza et al.
1005
(
MO
,
P
,
TAN
);
Analamazaotra
,
950 m
,
29.X.1996
, fl.,
A. Randrianasolo
515
(
G
,
MO
,
P
,
TAN
);
Mantadia
PN,
c.
11 km
N of village of Andasibe
,
18°49’47’’S
48°25’56’’E
,
939 m
,
10.I.2003
, ster.,
A. Randrianasolo
781
(
MO
,
P
,
TEF
);
Ambatovy
,
18°49’28’’S
48°19’23’’E
,
1134 m
,
26.XI.2005
, bud,
Razafindraibe
135
(
MO
,
P
,
TAN
);
Analamazaotra-Périnet
, [
18°56’S
48°26’E
],
6.XI.1957
, bud,
Service Forestier
18400
(
G
,
K
,
MO
,
NY
,
P
[2 sheets]);
Ankazomanitra
, PK 45,
route Anosi-be-Moramanga
, [
19°58’S
48°08’E
],
6.XI.1968
, bud,
Service Forestier
26800
(
G
,
MO
,
NY
,
P
,
TEF
);
W
d’Antanandava
(PK 45
Moramanga-Anosibe
), [
19°08’S
48°15’E
],
XI.1968
, fl.,
Service Forestier
28453
(
G
,
MO
,
P
,
TEF
);
ibid. loco,
XI.1968
, bud & fl.,
Service Forestier
28454
(
G
,
MO
,
NY
,
P
,
TEF
).