BLUMEA
46
67-69
(2001)
Mallotus kongkandae (Euphorbiaceae), a new species
Peter+C. van
1
Welzen
from Thailand
I & Kanlaya
Phattarahirankanok
Summary
Mallotus
kongkandae
glandular scales endemic
Key
when
to northern
words
is
a
dry,
new
species
in
thick-walled
section
fruits,
Rottlera.
and the
Typical
seemingly
the ovate
are
caducous
leaves, greenish
columella. The
plant
is
Thailand.
: Euphorbiaceae,
Mallotus
kongkandae,
Thailand.
INTRODUCTION
Chayamarit
et
al.
collected
recently
Thailand (Kamphaeng Phet hairs and leaves
glandular scales)
comprises
several
species)
and
M.
montanus
often
when fresh)
most
locally
(Miill. Arg.) Airy Shaw,
of all,
the
glandular larger,
leaves, merits the description of a are
new
unknown. The
(still)
scales
thicker
kongkandae
species,
new
another, very locally endemic species
Mallotus
very
(red
or
species,
pilis
aggregata ovata
inermis, paries
2-3
Fructus
mm
stellatis
simplicibusque
subglobosus
crassus.
Chong Yen,
Nationaal
12
Herbarium
Netherlands;
2) Bangkok Thailand.
July 1999,
1340
Nederland,
when
mm
thick)
together
dry,
the
in the other and the
with the
the staminateand
ovate
pistillate
named after the collector, represents
—Typus:
et
nov.
elobatus K.
—
1
Infructescentiae
squamis glandulosis
Chayamarit
Fig.
squamis glandulosis viridulis.
infra tomentosa trinervata.
et al.
BKF, K), Thailand, Northern District, Kamphaeng Phet Prov.,
The
(2-3
Welzen & Phattarahirankanok, spec.
Arbor. Indumentum densum
solitariae.
are,
yellowish
in section Rottlera.
Folia alternata sed distaliter terminales
1)
Typical
whitish
though
repandus
species ( M. lepto-
pallidus (Airy Shaw) Airy
walled fruits
even
of
(stellate
Section Rottlera
Mull. Arg., M.
endemic
M.
provinces
Mallotus Lour,
Shaw (1968), because the
caducous fruit column. This character combination,
seemingly
flowers
Airy
a
(Airy Shaw, 1972).
is different in several characters.
specimen
greenish (orange
of the northern
one
obviously
widespread species (M. philippensis (Lam.)
stachyus Hook.f., new
is
plant
unarmed
are
(Willd.) Miill. Arg.), but also several,
Shaw). The
in
specimen The
of section Rottlera (Willd.)
alternate and the fruits
are
a
Province).
1551
Mae
dense obtectus
(holo L;
Wong
iso
National
AAU, Park,
m.
Universiteit
Leiden
branch,
P.O.
Box
9514,
2300 RA
Leiden,
e-mail:
[email protected]
Forest Herbarium
(BKF), Royal Forestry
Department, Chatuchak, Bangkok 10900,
68
Fig.
BLUMEA
1. Mallotus
glandular one
areas
kongkandae adaxially;
attached seed
Tree,
c.
8
m
tomentose
glandular
c.
Welzen
fruit;
( K. Chayamarit
&
et al.
most
scales.
parts
terete,
cm
through
2-3
mm
when young, c.
tendency
long,
No.
1,
2001
fruit
a.
Habit;
showing
b.
thick
base
wall;
of leaf e.
with
columella
two
with
155J, L).
Stipules triangular,
1.5-5
46,
Phattarahirankanok.
section
high; flowering twigs
on
inside. Leaves alternate with
petiole
d.
Vol.
thick, young parts of
consisting 1.5 to
somewhat
by
0.6
mm,
terminal
pulvinate
on
Indumentum
and stellate hairs and
tomentose
groups at
tomentose.
simple
outside, glabrous
the branches,
both ends, with
simple;
longitudinal
P. C.
when
ridges
Welzen
van
dry,
&
K. Phattarahirankanok:
3.4-5.5
by
symmetric, drying greenish, older leaves seen), apex
seemingly glandless (only
Thailand
kongkandae from
when young; blade ovate, 8-18
tomentose
width ratio 2.4-3.3, chartaceous, entire and
Mallotus
cm,
length/
base rounded,
gradually
69
margin
acute to
acu-
minate, mucronulate, upper surface glabrous except for the basal part of the midrib, with 2, black,
basally
glandular
lower surface tomentose, white,
petiole attachment,
areas near
glandular
nerved, trinerved, slightly raised above, raised underneath,
marginally looped inflorescences 3.5-8
inside, bracts
tomentose; bracts and bracteoles 1
c.
terete, tomentose, flattened
and closed, veins scalariform, veinlets
and flowers unknown. Infructescences
long,
cm
by
0.8
mm,
dorsoventrally),
of orange
(green
when
bracteoles
0.5
c.
with abscission
subbasally
mm
dry) glandular scales,
column
apically;
6
c.
mm
11
c.
by
3.5
Distribution Mae
Wong
Ecology Note biaceae
Royal
single
mm,
—
—
not
branching,
outside, glabrous
Pedicels 2.5-3
mm
Forest
long,
capsular, subglobose (slightly
mm, not
armed, with dense covering
somewhat ribbed and
long, apically
10-12 per side,
wall thick,
broadened and
ridge
on
pustular
2
c.
mm
when
dry,
in middle
T-shaped,
to
caducous.
axillary side,
Endemic in Thailand, Northern Division,
in
Fruiting
Chong July.
Yen.
Only
Kamphaeng
known from the type
c.
5
by
Altitude 1340
Phet Province,
specimen.
m.
Named in honour of the main collector and initiator of the Thai
Project,
in size;
per locule, dark brown, naked.
National Park, —
tomentose
mm.
Fruits
Seeds ± ovoid but somewhat flattened and with central 4.2
mm
reticulate. Staminate
terminal, single,
0.5
by
tardily dehiscing loculicidally, partly septicidally; 3
0.7
by
nerves
densely
triangular,
zone.
lobed, 12-14 by
not
1
c.
scales many, domatia absent; venation penni-
Kongkanda
Mrs. Dr.
Chayamarit
of the Forest
Euphor-
Herbarium (BKF),
Department, Bangkok.
ACKNOWLEDGEMENTS
We like
a
thank
to
translation
Jan
joint Programme by
and
van
into Latin. We
Biotechnology)
Os
are
(L)
also
the Thai
for
for his
Research
funding
beautiful
grateful to
the
BRT
Fund
drawing
and
(Biodiversity
and the National
Euphorbiaceae of
Jan Frits
Veldkamp (L)
Research and
Thailand
Centre
for
the
Training Programme,
for Genetic
Engineering
Project.
REFERENCES
Airy Shaw,
H.K.
1968. Notes
H.K.
1972. The
on
Malesian
and
other Asiatic
Euphorbiaceae.
Kew
Bull.
392.
Airy Shaw,
Euphorbiaceae
of Siam.
Kew
Bull.
26:
292, 293,
299-301.
21:
391,
