VNƯ Journal of Science, N atural Sciences an d Technology 23 (2007) 86-90

Two new species of the genus Arisaema Mart. (Araceae)
described for Flora of Vietnam
Nguyen Van Du *
I n s titu te o fE c o lo g y a n d B iological R esources, V ietnam ese A c a d e m y o f Science and T echnology

18 Hoang Quoc Viet, Hanoi, Vietnam
R eceived 10 A u g u st 2006

A b stract. Arisaema omkoiense G u s m a n a n d A . ramulosum Andervv. h av e been described as nevv
reco rd for Flora o f V ietn am . A m o n g them , Arisaema omkoiense w a s fo u n d in C hieng M ai (T hailand)
recently by G u sm a n , novv re c o rd c d in C en tre V ietnam (Q u an g T ri a n d K o n tu m prov.). T he o th er
One, A ramulosum A ndervv. an en d e m ic of In d o n e sia for longtim e, has been fo u n d in N o rth e rn
V ietn am (C ao B ang a n d Bac C an prov.).

1. In tro d u ctio n
The genus Arisaema c . M art. (Araceae
Juss.) includes ab o u t 170 species [1]. They are
distributed m ainly in A sia an d few species
there are in E ast-N orthern A írica and
N orthern A m erica [2]. Beíore, this gen u s w as
recorded w ith 5 species belonging to 2
sections in V ietnam [3-6]. R ecent stu d ies [7-9]
ha ve recorded 16 species of this gen u s know n
in Vietnam. AU of them belong to 4 sections
(following M u rata's concept [5]) o r 5 sections
(following GusmarTs concept [10]). Base on
the M urata's system [5], am ong V ietnam ese
species, 12 species belong to the section
ỉimbriata, 2 species b elong to th e section

that vvere carried o u t the author and Mary
Sizem ore (Plorida, USA) and John Tan Hoew
(Singapore), a species of Arisaema genus was


N g u y en Van Du / VblU Ịournaỉ o f Science, Natural Sciences and Technology 23 (2007) 86-90

coilected. T hrough m orphological analyses,
vve recognized that the characters of this
species com pletely fit to the species A.
ramulosum
Aldrervv. This investigation
surprised us because A. ramulosum vvas an
endem ic species of Indonesia for long time
but now it has been íound in N orthern
Vietnam vvhere is separated from Indonesia
not only by distance b u t also by sea.
Hovvever the identiíication vvas coníirm ed
w hen type specim ens of A. ramulosum
checked by the auth o r in Borgo herbarium
(BO) in N ovem ber, 2005 and m any
discussions betvveen the au th o r and superspecialist of this genus in vvorld.

2. D escrip tio n of new species
1.
A risaem a o m k o ien se G usm an 2001.
Syst. Geogr. Pl. 71: 3; id. 2003. Arisaema. Mon.
Bot. Mat. Lov. 83.
R hizom atous herbaceous plant, c. 60 cm
tall. Rhizom e short, 1.5-3 cm long, c. 1 cm in

m ale flow ers consisted by 2-3 stam ens,
stam ens w ith a sh o rt stipitate, 0.5 m m long,
anthers subglobose, dehiscent by pore at
apex, íilam ent depressed, base attenuate,
u p p e r n arro w triangular, apex elongated into
an acum ination; bisexual spadix 6 cm long;
íem ale p o rtio n cylindrical to lightly conical,
1.8 cm long, ovaries loose in arrangem ent,
ovaries subglobose to spindle shape, truncate
at apex, stigm a d o t íorm , penicillate, not
rarely serrated disciíorm (in m aterial VH
070), style sh o rt conical; m ale portion c. 8 m m
long, few íem ale in loose arrangem ent, 2
stam ens g ro u p in 2, íilam ent 1.5 m m long,
connected together at 0.5 m m , u p p er portion
divided, c. 0.3 m m long, apex elongate in
subulate form , c. 0.3 m m long; appendix
rather stout, lightly conical, 2 m m w ide at
base, densely covered vvith filiform steriles
from base to apex.
Typus: Thailand, Qìiengm ai prov., near
Omkoi, G usm an GG00013 (holo BR (original type
pictures!); iso. BKF).
Habitat: P rim ary and secondary boardleaved evergreen sub-m ountain íorest on
very steep rocky shale Southern slopes of Sa
M ui m ountain; 1200-1300 m alt.
Distribution:
V ietnam
(Q uang
K ontum ), T hailand (Chiengm ai).

cross over anthers.
2.
A risaem a ram u lo su m A lderw . 1922.
Bull. Jard. Bot. Buitnezorg 3(4): 166; G usm an,
2003. Arisaema. Mon. Bot. Mat. Lov. 181.
H erbaceous tuberous m onoecious plant,
9-30 cm tall, usually sm all in m ale plants.
Tuber subglobose, 0.5-4 cm in diam ., light
brow n ou t side, vvhite in side. Leaf solitary;
petiole 9-30 cm long, pale to d ark som etim e
dirt green, low er portion created into
pseudostem 5-15 cm, free portion 4-15 cm
long; leaf blade triíoliolate, lobes d ark green
on suríace and paler at u n d er suríace, glossy;
lateral lobes subsessile, lanceolate ovate,
7.5 - 12 cm long, 4.5 - 6.2 cm vvide, oblique,
ba se obtus to round, apex acum inate 1-1.5 cm
long, tip arista; Central lobe vvith a stipitate,
ovate lanceolate, 7-14 cm long, 4-8 cm vvide,
base cuneate, obtus to round, apex acum inate
w ith short arista at tip. Peduncle equal,
shorter or little longer than free portion of
petiole, 7-12 cm long, pale green or brow n
w ith w hite rouges; spathe long 5-8 cm long,
tube cylindrical, 2-4 cm long, c. 1 cm vvide,
w hite to pale green or little purplish, m ottled
and w ith longitudinal, d ark p u rp le stripes,
inside white; m outh m argin green and hardly
recurved; spathe lam ina triangular, 3-4 cm
long, outside dull, pale green, glossy, w ith

Materials exampled: Cao Bang prov.y Tra
Linh distr., Q uoc Toan com m unity, Thang
H en lake, A veryanov et al. VH 4873, 4874
(HN, LE), N guyen Van Du 404 (HN).
Discussion: In the section Pimbriata, 3
species have spathe having d ark cross b m d
at base of spathe lim e as A. ramulosum A.
penicillatum and A. ỉaminatum. A. ramuloìum
distinguished from A. peniciỉlatum by its
spathe tube vvhitish, equal or shorter than
lam ina portion, w ith o u t w hite area betvveen
tube

an d

distinguished

lam ina.
from

A.
A.

ramulosum
ỉaminatum

also
by its

appendix stout subulate, vvith few sterile

V ietnam ese).

Plate: A risa em a o m k o ie n s e G u sm an
2. Habit; 2. Spíĩthe; 3. Female spadix; 4. Male spadix;
5. variation o f maỉeỊĨoĩvers; 6. Ovary.

7 (2002) 69.
[8] N g u y e n V an D u, O n e nevv species of the genus
A risaem a c. M art. (A raceae) for the Flora of
V ietnam , Ịoum . ofBiol. 26 (2004) 54.
[9] N g u y e n V an Du, p.c. Boyce, T w o N ew Species
of T he G enus A risaem a (Araceae: Arisacmateae)
from Northern Vietnam, Folm Míỉhĩysừtrm 6 (2005) 35.
[10] G. G u sm an , G. Liliane, The genus Arisaema. Publ.
House. A.R. Gantner Verlag Mommanditgeseilschaít
FL. 9491, R uggeỉl. G erm any, 2003.

Pictures: A risa em a ra m u lo su m A lderw
H a b it a n d íem al spadix.
(Photo: N g u y e n V an Du).


90

N g u y e n V a n D u / V N U Ị o u m a ỉ o f S cie n c e , N a tu r a l S c ie n c e s a n d T e c h n o lo g y 2 3 (2 0 0 7 ) 8 6 -9 0

Mô tả 2 loài mới thuộc chi Arisaema Mart. (Araceae)
cho hệ thực vật Việt Nam
•