A JOURNAL ON TAXONOMIC BOTANY,
PLANT -SOCIOLOGY AND ECOLOGY

REINWARDTIA

. Editors
MIEN A.

KIJS WAT A KARTAWINATA
N. WULIJARNI-SOETJIPTO

1 Published by '
HERBARIUM BOGORIENSE

LEMBAGA BIO-LOGI NASIONAL — LIPI
BO.SOR, INDONESIA

Eeinwardtia Vol. 9, Part 1, 1 —182 31 December 1974

10- ISSN 0(f34-365X



REINWARDTIA
Published by Herbarium Bogoriense — LBN, Bogor

Vol. 9, Part 1, pp. 139—142 (1971)

A NEW AMORPHOPHALLUS FROM THAILAND

KAI LAKSEN & S. SAKSUWAN LARSEN

Botanical Institute, Aarhus University, Denmark.

ABSTRACT

AmorpknphoMus dixenii is described and illustrated; this new species
is assigned to section Cimdaritm and key to Asiatic species of this section
is presented. Chromosome number of this species is found to be 2n = 28.

ABSTRAK

Pertelaan bergambar AmorphophaUna ditremi disajikan; jenis baru
ini dimasukkan dalam soksi Cuiidarum dan kunci determinasi jenis-jenis
seksi ini yang ada di Asia dieuguhkan juga. Jumlah kromosom jenis
ini ternyata 2n zz 28.

During an expedition to Thailand in 1970 Mr. Hans Dixen (Aarhus)
collected a large tuber of an Amovphophailvs at Doi Chieng Dao in North
Thailand. The tuber was sent back and planted in our greenhouse in
January 1971. In the early summer it produced an inflorescence, the
study of which showed that it belonged to an undercribed species;
2 - 3 months later one large leaf developed (Fig. l a ) . Vfe have chosen
to name this species after the collector.

The taxa clearly belongs to the section Cnndarum Engl. (in Engler,
Pflanzenfam. IV. 23 C. 1911). It is related to A. campamdatus (Roxb.)
Bl. ex Dene (Syn.: A. rex Prain ex Hook, f.) from which it deviates
in that the appendix has a truncate apex and a more narrow and closed
apathe. The anthers are longer in our species and the ovary always seems
to be 2-celled, correspondingly the stigma is always 2-lobed.

K E Y T O S E C T I O N C U N D A K U M I N M A I N L A N D A S I A

1-a. A p p e n d i x g l a b r o u s A. dubius Bl.
b . A p p e n d i x i r r e g u l a r l y f u r r o w e d . . . 2

2-a. A p p e n d i x t r u n c a t e - c o n o i d A. ilixemi It. & S. L a r s e n
b. A p p e n d i x conoid 3

3 -a. A p p e n d i x up to 5 cm diam A. eampanalatus Gagnep.
b. Appendix 7 - 1 2 cm diam A. bungkokensis <Ronb.) Bl. en Dene.



REINWARDTIA [ V O i * 9

*

rpkophalhte dixexii K. & S. Larson. — a. leaf;
nther, erosg Eection; £-g. anther; h. gynoe

nthe

oX ovary; j. cross ry — del. B. Johnson.

-, longitudinal
Udinal section

L A H S E U & L A H S I

Amorphophallus dixenii K. & S. Larsen, spec. nov. — Fig. 1.

A. campanulato affinis, appendice spadicis trtmcatoeonica, spatha
altiore angustiore, staminibus et ovario dissimilibus ab eo diversus.

Tuber supra depressum, circiter 15 cm altum, 25 cm diam., radicellis
praesertim e facie superiore emissis.

Folia: Cataphylla 1 (—2), majus circiter 10 cm Icnijnim, membrana-
Ceum, amplcxicaula. Folium vei-um unicum; petiolus 95 cm iongus,
basi 4 cm diam., viridis albo-marmoratus, verrucosus; lamina tripartite,
partibus circiter 100 cm longis, infra per 20 cm carstoiilibus, simplicibua,
supra bis dichotomis, e segmentis inaequalibus compositis, rhachibua a
segmentis decurrentibus alatis.

Infloreacentia: Pedunculus 40 cm longus, 2.5 cm crassus, dua
cataphylla infra gerens late lanceolata, 10—15 cm longa, 5—8 cm lata.
Spatha profunde campanuliformia, medio apulum constricta, 20 cm longa,
basi 6 cm diam., medio 8—9 cm, supra margin© evoluto 15—18 cm,
extra infra partem constrictam viridula, supra vinacea vel subfusca,
ubique maculia albis aparsis notata; intra in parte infima 7 em alta
(juxta flores femineos) saturate vinacea, vevrucosa, supra per 3 cm lutea,
laevis, in summa parte vinacea, reticulata, margine undulata, apulum
revoluta. Spadix in parte infima 7 cm longa cylindrica 5 cm crassa flores
femineos gerens, obscure vinaceus, stigmatibus aurantiacis vel flavidis,
in parte superiore 6 cm longa infra 3 cm crassa aurantiacus, flores
masculos gerens; appendix plus minus cylindvica vel truucato-conica,
plicata, 5 em alta, 10 cm diam., vinacea, verrucosa.

Flores: Flos feminius nudus; ovarium 2 mm altum. 3.5—4 mm
latum, bilooulare, ovulo in quoque loculo unico anatropo; stylus 14 mm
longus, 1 mm crassus; stigma 3 mm longum, 4 mm latum, profunde
bipartitum. Veatimentum masculae partis spadicis e staminibus solum
compositum. Stamen bacilliforme, 1—1.5 mm latum, 4—5 mm longum,
filamento brevissimo, anthers duabus poris terminata bipartitis, quattuor
sacculis ita sua cuique part eapertis.

Pollen; Grana substantia flavida conglutinata, copiose in fundo
spathae concervata.

Fructus ignotus.
Numerus chromoKomatuin: 2n = 28.
Typus. Tuber die 20 Oct. anni 1970 650 m supra mare in solo

humido silvae sempervirentis montancae ad montem Doi Chieng Dao
ab oppido Chieng Mai in septentriones situm a Hans Dixen sub numero
701515 lectus, in Horto Botanico Aarhusiensi culhim, materie typifica
anno 1971 Me collecta, in Herbario Jutlandico (AAU) deposita.

In an earlier paper (Larseti in Dansk Bot. Ark. 27: 46, 1963) the
cytology of the genus AmorpkopkaUvs was discussed. It was here stressed
that our knowledge does not yet allow too far reaching conclusions,
but two secondary basic numbers seem to exist xL. = 13 and 14. Recently

•chant {in Kew Bull. 25; 323, 1971) added chromosome numbers for



REINWARDTIA [VOL. 9

Fig. 2. 2 mptaphase plates fr foot tip;

A. dixenii fita well into this pattern. In several good metaphase
plates from root tips 2n = 28 was counted (Fig. 2). The morphology of
the chromosomes corresponds to what has been found earlier.

The author is indebted to Mr. Tyge Christensen for latinizing the
diagnosis.

RE I N WARBTIA
Published by Herbarium Bogoriensc — LBN, Bogor

Vol. 9, P a r t 1, pp. 143 — 151 (1S74)

A REVISION OF PLETHIANDRA (MBLASTOMATACEAE)

M. P. NAYAR
Central National Herbarium, Botanic Gardrn, Htneruh — 3, India

ABSTRACT

Seven species are dtscribed and a key to the species is presented.
The genus is recorded foe the first time from Central Sumatra and this
record is an extension of its generic distribution, known previously from
Borneo and Malaya. Plethiandra acaminata Merr. and Plethiandra
aahebii Burkill are reduced to synonymy and the following new com-
binations are proposed: Plethiandra robuata (Cogn.l Nayar, Plethiandra
seesiliflora (Cogn.) Merr. var. *«**H« <Stapf) Nayar.

ABSTKAK

Pertelaan dan kunci detcrminasi untuk membeda-bedakan tlljuh jenis
Plethiandra disajikan. Marga ini dilaporkan untuk pertama kali dari
Sumatra Tcngah, yang memperluas daerah penyebarannya Eebab sebelum-
nya hanya diketahui tumbuh di Borneo dan Malaya. Pletkiandra
acuminata Merr. dan Plethiandra sahebii Burkill diperlakukan sebagai
sinonim jenis lain dan kombinasi baru Plethiandra robvxta (Cogn.) Nayar
dan Plethiandra sessiliflora (Cogn.) Mcrr. var. seesilis (Stapf) Nayar
telah diusulkan.

INTRODUCTION

J. D. Hooker founded the genus Pletliituulra in 1865 on the basis of
methiandra motleyi from Labuan (Borneo). He placed it in the tribe

jjlstronieae immediately next to the genus Kibansia. Baillon (Nat. Hist.
PI. 7: 63. 1881), Cogniaus (1391) and Krasser (1893) followed Hooker f.
in its assignment.

The genus was described again as Medinillopsis by Cogniaux (1891)
with two species MedinUlopsis beccwriana from Sarawak and Medinillopsis
sessiliflora from Singapore, both baaed upon Beccari's collections.
In 1895 Stapf noted that Coguiaux's Medinillopsis matched perfectly
with Hooker's genus Plethiandra and he suggested the reduction of the
genus Medinillopsis. Although Stapf and later on Burkill (1917) suggested
this, it was left to Merrill (in Journ. Roy. As. Soc. Straits Spec. No. 449,
1921) to make the new combinations in the genus Pletkiandra.

Stapf in 1894 (in Trans. Linn. Soc. II, 4: 163, 1894) after
"ding a new species P. hookeri noted the correct systematic position



i C O N T E N T S

P a g e

H A T T I N K , T. A. A revision of Malesian Caesalpinia, i n c l u d i n g
, Mezoneuroji ( L e g u m m o s a e - C a e s a l p i n i a c e a e ) 1

• J O N E S , H . G < Orchidaceae n a v a e vel m i n u s cogtlitae . . . . . . . 7 1

K E N G , H. Rediscovery of Cheilotheca malayana a n d t h e i d e n t i t y of .
Cheilotheca, Audresia and Mo.notropastmm (Ericaceae- .
M o n o t r o p o i d e a e ) 7 7

K O S T E R M A N S , A . J . G . H . A m o n o g r a p h o f t h e genus- N.eoanna-

•momum L i o u H o 8 5

M a t e r i a l s f o r a r e v i s i o n o f L a u r a c e a e I V . . . . . 9 7

r? A new Bornean species .of Mammea , . 117

Triadodapkne, a. new Jauraceous genua from Borneo . 119

— A monograph of Caryodaphnopsis A. Shaw . ., . . . 123

LARSEN, K. & LAKSEN, S. K. A new Amorphophallus from Thailand ' 139

NAYAK, M. P. A revision of Phtkiandra (Melastomataceae) . . 143

RAO, A. N. £ LEONG, F. L. Pollen morphology of certain tropical ,
• plants . . . . . . . - . • 153

SKVORTZOV, B. V. On some colourless flagellates from Java and Brasil 177

Distributor
BIBLIOTHECA BOGORIENSIS,

JALAN RAYA JUANDA 20,
EOGOK, INDONESIA

by ARCHIPEL


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