New taxa and nomenclatural changes in Rhynchosia Lour. and Eriosema (DC.) Reichb. (Leguminosae-Papilionoideae-Phaseoleae) from Madagascar and the Comoro Islands

12 Pages·1996·5.5 MB·English

by  J-N Labat

m
J
to
{ i
Ravonjiahsoa M120).
The specific epithet refers to the Androy region of southern Madagascar, where the majority
known
collections originated.
•
Rhynchosia
chapelieri Baillon
Mens. 387
Bull. Soc. Linn. Paris (1883).
1:
Lectotype (chosen here).—Bernier 247, Diego Suarez [Antsiranana], (P; iso-, P).
s.d., fl., jfr.
Of the 3 syntypes of/?, chapelieri Baillon, only one of them {Bernier 247) corresponds closely
young specimen must
with the type description, particularly in the presence of pods. This there-
fore be chosen as the lectotype. The pods are submembranaceous and flat, identical to those of
Perrier de Bathie 16323, the holotype of R. denisii R.Viguier, which is therefore considered
la
which
be synonym. The two syntypes (Chapelier and Boivin 2236-bis), both
to a other s.n.
later
&
Du
much now named Puy Labat
lack pods, belong to the more widespread species R. leandrii
known
(which was
previously as R. chapelieri).
&
Du
Puy
leandrii Labat, sp. nov.
387
Soc. Linn. Paris (1883),
1:
]
W
Majunga (Mahajanga),
Type.— & Du Puy & Andriantiana M504, Madagascar, Province of
D.J. B.P. J.
km
west of Marerano, 19°04'S-
Bemaraha Massif, south-eastern end, behind the eastern escarpment, ca. 14
MO, TAN, WAG).
NY, PRE,
45°03'E, ca. 500 m, 20.111.1990, (holo-, K; iso-, K, L, P,
fl., fr.
m
A clumps
forming dense, tangled
perennial, climbing herb or subshrub to ca. 3 tall, often
cm
woody
becoming and up
of interlaced stems; stems twining, finely pubescent, to ca. 3 in
mm,
50-90 x 60-1 the base
broadly triangular-ovate (deltoid), 10
diameter. Leaflets the terminal
3,
and pubescent
gland-dotted thinly
broad and apex abruptly short-acuminate, sparsely
truncate, the
mainly on the veins above and beneath, deep green and oily above, paler beneath.
secondary branches
with
Racemes cm flowers often paired, often
10-20 long, dense, the
compound,
combined
and into a
towards sometimes also terminal
the base, mostly axillary but
mm
yellow-brown,
Flowers 8-9 long, the
yellow pubescent.
leafy densely
inflorescence, the axis
many red-brown veins front
red-brown and with fine in
standard yellowish but strongly stained
yellow-green
and behind and with small brown basal eye, the wings bright yellow, the keel
a
mm about
yellow pubescent; teeth triangular,
densely
tinged brown. Calyx 3-4 long, shortly but

towards the apex behind; wings
linly
mm,
Pods 14-18x8-9
in dense, pedunculate infructescences, persistent, oblong, compressed,
very shortly but densely velvety pubescent with scattered long, spreading hairs, but without swol-
when
len-based hairs, pale olive green mature, opening along the upper margin and becoming
2236
in Nossi Be, syntype of cihtpciicri Hailloni:
bis. s.d., fl. (P, A'
2733, Diego-Suarez, Bosser 8173, Sahamaloto, ouest du Alaotra, VI. 1955, TAN);
s.d., (P); lac fr. (P,
fr.
Decary
Chapelier s.n., Madagascar boreal, s.d., fl. (P, syntype of R. chapelieri Baillon); 18903, district
km
SE
de Sakaraha, Lambomakandro, 3.III.1943, (P); Dorr et 3455, Antananarivo Province, 14 of
al.
fl.
MO,
Ambaravaranala (71 km \\V ol rsiroanomandidy), 10.1.1985, fr. (K, P, TAN); Jardin Botanique de
Tananarive 3280, lac Alaotra (MEN-62), s.d., fr. (P); 4349, lac Alaotra (E-12), s.d., fl. (P); 5418, Befandriana
Nord, Ampotamainty, 29.X.1942, Leandri 824, Tsingy de Bemaraha (9eme reserve), Tsiandro,
(P);
fr.
& E
10.11.1933, (P); 880, ibid., X-XII.1933, (P); Leandri Saboureau 2830, Antsingy, vers Bevary,
fl. fl.
d'Antsalova, 400-600 m, 1960, (K, MO, WAG); Moral 2136, Horombe, Andiolava, 11.1965,
27.I-5.II. P,
fr.
MO,
km TAN);
(TAN); Peltier 1089, Ambodimanga, 364 route de Majunga, 18.IX.1959, (K, P,
fl. fr.
Perrier de la Bathie 554, Firingalava, IV. 1898, (P); 554bis, Morataitra, rive droite de la Betsiboka en
fl.
amont de son confluent avec lTkopa, IV. 1899, (P); 554bis, ibid., VI. 1899, fr. (P); 4362, Boina, Haute
fl.
Bemarivo, 1907, Seyrig 617, environs Ampandrandava, entre Bekily et Tsivory, cretes est,
IV. (P);
fl., fr.
Ampandrandava.
vers 1100 m, 826 Jardin Botanique de Tananarive 6404), environs
IV. 1943, (P); (also in
fl.
entre Bekily et Tsivory, region de Moraharivo au SE d 'Ampandrandava, vers 1000 m, VIII. 1944, fr. (P).—
Comoro
islands: Boivin Mayotte, Pamanri, XI.1850, (P); Labai & Pascal 2723, Mayotte, pres
s.n., fr.
MO,
du village de Choungui, 12°57'30"S-45°07'35"E, 300 m, 12.IV.1996, fl., jfr. (K, P).
now
when pods and has
R. leandrii closely resembles R. chapelieri except are present, until
been known under name. R. leandrii easily recognised in fruit by its oblong, cori-
this latter is
aceous, minutely velvety, pale green pods opening along the upper margin to expose a copper-
coloured interior with 2 deep blue, glossy seeds, while the pods of R. chapelieri are purse-shaped,
Both
thin-textured and membranous, finely and thinly pubescent, and are probably indehiscent.
R. leandrii and R. chapelieri have large, broad leaflets with truncate bases and abruptly short-
pubescence on stems,
acuminate brownish flowers and a uniform, dense, short the in-
apices,
florescences, calyces and standard petals.
uncommon western region of Madagascar, par-
throughout
R. leandrii widespread but the
is
Bemaraha Massif recorded from Lac Alaotra, but possibly
ticularly in the Boina and the (also
woodland
Comoros. occurs open woodland,
from
introduced and recorded the in
also
there), It
it is
m
(100-)300-800 recorded
margins and on exposed rock outcrops, on limestone, at altitude. It is
as flowering from December to April, but probably also flowers at other times of the year. In
known under vernacular names of "Ha-
the western region of Madagascar, R. leandrii the
is
zovongy"
"Masonamboaromotra".
or
of outstanding contributions
recognition his
This species dedicated Jacques Leandri, in
to
is
from Be-
through collections the
to Malagasy and systematic botany, particularly his
floristic
maraha
Massif which R. leandrii occurs.
in
Rhynchosia Baker
versicolor
Soc, 132-133
Linn. Bot. 20: (1883).
J.
R. rhodophylla Baker, Linn. Soc, Bot. 20: 133 (1883).—Type: Baron 771, Central Madagascar (holo-,
J.
K;
iso-, P).
Soc, 465 (1887).—Type: Baron 3393, Madagascar (holo-, K;
R. trichocephala Baker, Linn. Bot. 22:
J.
Type.— Ambohimanga
Parker Madagascar, (holo-, K).
s.n.,
and
R. versicolor usually a suberect to scrambling subshrub, the shoots often with axillary
is
terminal inflorescences, with only a few shoots climbing or twining. The density of the indu-
on
mentum and presence of swollen-based, yellowish bristles
also variable, in particular the
is
and allows the
the pods and inflorescence axis. This latter character varies with the distribution
two
separation of distinct subspecies as follows:
amongst white,
Pod, ovary and inflorescence axis with swollen-based, yellow, bristly hairs present the
silky hairs without a swollen base; stems often short and not twining, generally giving a suberect,
shrubby habit, although often also with some shoots elongated and scrambling or twining; terminal
versicolor
leaflet usually triangular-ovate with a broad, flat base (deltoid) subsp.
young
silky hairy with white hairs only (no swollen-based hairs);
s
ovate
twining, giving a distinctly climbing habit; terminal leaflet
R. versicolor subsp. versicolor
Plateaux
Subsp. versicolor occurs throughout the southern and western parts of the Central
of the
(mainly in the Betsileo and Bara regions), from Antsirabe and the south-western portion
Ankaratra Massif to the Andringitra and Isalo Massifs.
&
Du
Puy
R. versicolor subsp. imerinensis Labat, subsp.
cum
ibus que; foliis foliolo apicali ovi
solum
argenteis pilis ornatis.
Paratypes.— Madagascar:
Baron
873, Central Madagascar, 1149, ibid.,
(K); 984, (K);
s.d., ibid.,
fr. fl.
(K); Benoist 1282, Manjakatompo, 28.X.1951, (TAN): 1283. 1320, 26. V. 1951,
fl. ibid., (P); ibid.,
fl. fr.
.
(P); Bosser 914, Fenoarivo, route de Beanana, VI. 1951, (TAN); 7843, Tampoketsa d'Ankazobe, P.K.
fl.
.

—
—
94
penon Decay 7442, d'Ambohitantely au nord d'Ankazobe, 12.111.1930,
s.loc, (P); foret
s.n., s.d., fl., fr.
13844, Imerina, Behenjy, 11.V.1939, (P); 19309, Tampoketsa d'Ankazobe, 29.IV.1943,
(P); fl., fr.
fl., fr.
MO, Humbert & Perrier de Bdthie 2233, environs de Tananarive, mont Angavokely,
(K, P); la
fl., fr.
1500-1750 m, 10.VIII.1924, Jardin Botanique de Tananarive 2471, Angavokely, 2.V.1937,
(P); fl.
fl., fr.
km
(P); Keraudren 56, environs de Tananarive, Angavokely, 11.1960, (P); Leandri 2565, Angavokely, 40
fl.
E de Tananarive. 14.1.1960. fl. (P); 3172. ibid.. 25.11.1960. fl. (P); 3267, ibid., 20.X.1960, fl., fr. (P);
(MO, TAN); d'Ambatolampy,
Peltier 1185, canton de Carion, Angavokely, 25.X.1959, 1883, district
P,
fl., fr.
&
Amboasary, 4483, (MO, Leandri Bosser 1731, An-
14.11.1960, fl. (K, P); s.loc, s.d., fl. P); Peltier,
d'Am-
gavokely, sommet de l'Angavobe, 14.1.1960, (P, TAN); Perrier de la Bdthie 13770, environs
fl., fr.
MO, WAG).
PRE,
V.1920, (K,
P,
fl.
around Antananarivo (Im-
R. versicolor subsp. imerinensis confined the Central Plateaux
to
is
erina), including the Tampoketsa d'Ankazobe, Angavokely (E of Antananarivo) and the north-
woodland remnants
eastern portion of the Ankaratra Massif (Behenjy, Ambatolampy). occurs in
It
m
1000-2300
and on rocky slopes with some protection from on granite, gneiss and quartz, at
fire,
can flower throughout
altitude. the year.
It
R. versicolor subsp. imerinensis resembles R. sublobata (Schumach.) Miekle especially in its
pods, but can be distinguished from species by glabrous standard petal and the presence
this
its
of some silky white hairs on pods.
its
known
The specific epithet refers to the Imerina region of Central Madagascar, from where the
collections originated.
&
Du
Eriosema Puy
betsileense Labat,
sp.
Species E. Baker quod tropicam
affinis elliotii in
f.
habitu, longibus argenteis pilis indlis. foliolis vexilloque
1500-1700 n
ITtremo,
A
cm
probably
small, perennial, trailing herb; stems slender, unbranched, up to ca. 40 long,
from a perennial rootstock, minutely pubescent and gland-dotted, sometimes also with scattered
short hairs. Leaflets palmate (without a rachis separating the terminal from the lateral leaflets),
3,
the terminal leaflet elliptic to obovate, 8-33 x 5-14 mm, obtuse to cuneate basally, the apex obtuse
pubescent
to rounded, minutely appressed-pubescent above (appearing glabrous), glabrous to
mainly on the veins beneath, with numerous minute gland dots on both surfaces; petiole short,
mm mm
2-5 long; stipules 2-4 long, narrow.
cm cm
Racemes
1.5-4 long (to 6 in fruit), slender, with 1-4 flowers clustered near the apex.
mm
mm
Flowers 7-8 long, yellow. Calyx ca. 4 long, sparsely pubescent and gland-dotted; teeth
triangular, shorter than the tube. Standard with short hairs and densely gland-dotted behind; keel
Pods oblong, compressed, 12-15 x 6-7 mm, with gland-dots, swollen-based hairs and
short,
many
long, fine, yellowish hairs, dark brown, splitting into 2 spiralling valves. Seeds (1 or) 2,
28317); B,
undersurface with tbert
flowering habit; A', leaflet
C, calyx; D, standard petal; E, wing; F. keel; G, stamens; H, ovary (from Peltier 2175); I, pod; J, seed (from
g;
; I
from
E. betsileense only known from 3 collections, the description of the pods being taken
is
Madagascar by
Eriosema slender,
2237. distinguished from the other species of in its
Peltier
It is
densely gland-dotted
very short-petiolate, palmate leaves lacking a rachis, its
trailing habit,
its
and few-flowered racemes with the flowers clustered at the apex. E. betsileense
leaflets, its
decumbent herb with
which
resembles E. Baker from tropical east Africa, is also a
elliotii
f.
from
racemes and leaves. E. betsileense differs
few-flowered short-petiolate, digitately trifoliolate
more indumentum lacking the long, silky hairs charac-
this latter species in its slender habit, its
on and standard
of E. but with numerous gland dots present especially its leaflets
teristic elliotii
petals, shorter calyx teeth, and the presence of short, swollen-based hairs as well as long,
its
on
pods.
silky hairs
its
Mada-
E. betsileense only known from the Itremo Massif and near Ambositra, in Central
is
m
from
1300-1700 The recorded flowering time
is
gascar. occurs in grassland, at ca. altitude.
It
January March.
to
known
The specific epithet refers to the Betsileo region of Central Madagascar, from where the
collections originated.
Aymonin
Acknowledgements.—We Lemeux and Gerard for as-
thank Jacqueline for the illustrations
Du opportunity
Puy would thank Royal Society for the
sistance with the latin descriptions. Dr. like to the
Weston Foundation
to undertake collaborative research in the Laboratoire de Phanerogamie, Paris, and the
We
would
Kew.
Madagascar and Royal Botanic Gardens,
for the support of his continued research in at the
Royal
Herbarium,
also like to thank the Directors and staff of the Laboratoire de Phanerogamie, Paris, the
Recherche
de
Botanic Gardens, Kew, the Pare de Tzimbazaza, Antananarivo and the Centre National la
We of our field
Ecologique, Antananarivo. are grateful to the National Geographic Society for support
REFERENCE
&
PH.
Raven,
Polhill
Sertum
polynesicum
V.
Une
nouvelle espece de Sclerotheca
endemique
de
(Campanulaceae-Lobelioideae), Tahiti,
Polynesie Franchise
Florence
J.
Resume
Description d'une nouvelle espece, Sclerotheca
:
SE Espece remarquable
genres endemiques du Pacifique.
que d'une station du Mt Pito Hiti, second sommet de Pi
endemic
Summary: magdalenae, belonging one of the rare genera
Description of Sclerotheca to
A and known only from one point
of the SE Pacific. very striking species with large flowers at
Mt summit
second of Tahiti island.
Pito Hiti, the
Museum
Phanerogamic national d'Histoire naturelle,
de
e
endemiques des
lies
!
de
de une Cook. Dans cadre des importantes prospectu effectuees lors
la Societe, des ties le
i
mon
destinees a servir d
sejour dans de Polynesie francaise et
Territoire
le
moderne,
pu
j'ai recolte
Remarquable
comme
a considerer nouveau une partie de ce materiel.
-
jayorwn Raynal, son habitat
les plus grandes du genre avec
5. J.
m
un
1800 sur flanc
l'espece plus elevee, vers
situee a l'altitude la
en un point de
aussi par puisqu'etroitement localisee l'Tle.
sa rarete,
DC, oblongatis
anguste alato petiolo,
A. arborea A.
S. (J.G. Forster)
W
staminum majore fructu, a S. oreade
floribus, densiore pubescentia tubo,
praecipue
gioribus calycis dentibus majoribus floribus, differt.