A New Species of Aridarum, Schismatoglottideae, Araceae from the Muller Range, Central Kalimantan, Indonesia

2006·1.3 MB·English

by  Okada, Hiroshi

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ISSN 1346-7565 ActaPhytotax,Geobot,57(1)6:1-64(2006)

ANewSpecies Schismatoglettideae,Araceae from the
ofAridarum,
Muller Range, Central Kalimantan, Indonesia

HIROSHI OKADA

BotanicalGandens,FacultyofSciencOsea,kaCityU)iivensiKcb"tano,Osaka576-OO04,.]Zrpan.

A new rheophytic species, Aridaium minimum, section thulescentia, Schismatoglottide Aarea,ceae is
describedfromtheMullerRange,CentralKalimantan,Indonesia,

Key words: Araceae ,Ariclarum B,orneo, Malesia ,Muller Range, new species, rheophyte.
The botanica lexpedition to the Muller Range, 71gukaya ,H., 7lrkano ,A. & Naiki, A. TK-21
CentralKalimantan,IndonesiainDecember2004 (HolotypienBO, isotypiensL,KYO, TI,)

revealed many new species and some have been
described (Tsuka&yaOkada2005,Tsukaya Root Stcm Leaves;
already stout. sparsely creeping. petiole
et al, 2005) .In this paper a scientifically unlmown 4-7 cm long ,about 1-1,5 mm in diameter s;heath
rheophytic aroid of the genus Ariclarum Ridl. ,an with a free 3-4 cm long ligul eb;lade coriaceous,
endemic genus to Borneo Island ,belongin gto the dark green ,lanceola t4e.5,-7 cm long and O,7-1. 2cm
Schismatoglottidea eA,raceae, is describe dBo.gner wide, base narrowly cuneate, apex acuminate, mar-
& Hay (200 0r)evised the genus Aridorum and rec- gin prominentl ythickened ;venation fain tp,aral-
ognized eight species in the geriu sT.he aroid fbund lel m,id-vei nstrong. Inflorescen pceed;uncl e1,5-2.5
in the Muller Range is most similar to A. rostratum (-6 c)m long ,1 mm in diameter s,pathe not con-
Bogner et A. Hay but it showed distin cchtaracter- stricted, white (Fi gI.B), 1.5- 3cm long ,5-8 mm
isti cpsarticula ornl ythe shape .ofmale flower isn the wide, apex acuminate, upper three quarter tso two
spadix. third sof the spathe shed after anthesis, lower part
about 8 mm long ,green ,persisten St.padix ahout 1O-
Aridarum minimum H, Okada, sp. noy (Fi g1s, 2., 15 mm long and 4-6 mm wide; basa lfemale part
3)Herba. about 2 mm long, intermediate staminodial part
Viigina efolioru mcum Iigul alineari-lance- about 4 mm long ,fo11owe dby male part about 2
olata. Flore smasculini supra aspectu catenae cum rnm long ,ending in an appendix 5-8 mm long (Fig.
porca arcuata duos cavitates conectenti, 2), Flowers unisexual, naked. Female flowers in
7)lpus :INDONESIA, Centra lKalimantan: two rows, each consisting of an ovary about 1 rriln in
Dist, Murung Raya, near to Tumbang Naan diameter ,cylindrical, unilocular; stigma sessile,
(00D09'03 "1S1,3"45'04"E), Sungai (River)disk-lik aebo,ut O.6 mm in diamete rS,taminode sin
Lapangan, a branch of Sungai Joloi ,Lapangan, two rows, cylindrical, about 2 mm in diameter.
Heliped ll ,OOOII'OO"N ,113D31'59"E a,bout 200m Male flower sin two rows, with chain lik epattern
alt., Dec. 20, 2004, Okada, U, Nttgamasu, Il, with two sha]low cavities linke don the upper sur-
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62 APG Vbl,57

Fic }1,. An'doram tninimum sp. nev, A: Rheophyti chabita gtrowing together with a rheophytic fern ,Dipteri slobbiana ,B: Living plants
collected. Upper two thirds of spathe is white in color, Margin ofleafis pTominently thickened.
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Apml 2e06 OKADA: New Andurum, Araceae fromtheMullcrRange,Indonesia 63

FiG ,3. Malc part ofAridarum tninitmtm sp nov, t: Horne dtheca
ofstamcn.Scale=1mm,
funnel-shape dlower part of the spathe, slightly
expanded after anthesis, about 1 cm long and 1 cm
indiamcter.

Distributio nK:nown only from the type local-
ity'
Hdbitat: The sparsely creepjng stems ofthis
new species fastene dwith stout roots on large rocks
at the bottom ofthe rheophytic zone along a rapid
stream under a primary cvergreen rain fores ctom-
posed of Shorea spp. (Dipterocarpa Lcietaheo-),
carpus spp, (Fagace aAger)o,stistac hspy.s, Aposusa
sp., Baccaunea sp., Mdllotu sspp. (Euphorbiaceae),
ll./ls.I,Il/-
Garcini aspp. (Guttife rAnadei)s,i aspp., Labisia
sp. (Myrsinac Ua}cr)o,pdyil usmp,, R!ychotria spp,,
Lasianthus spp. (Rubiace aaned) other species.
Water leve lat the habita rtose about 2m after hcavy
i::
rain as judge fdrom the imprint osfdead leaves and
FIG 2. Spadi x(inflores cefeAnricdeai)um minirnum sp nov a: branches fiushe fdrom thc floode dstream. The habi-
appcndix, rn, male p=art ,s: staminodcs, f :femalc part .Mesh tat was a rheophytic zone along a tributar yof the
in the background 1 × 1 mm. Sungai (Rivc Jre)loi a, branch ofthe Barit oRiver,
where a typica lrheophytic fern Dipteris tobbiana
fac eand short horned theca con the proxima lside of (Hook .Mo)ore grew together with this new species
the stamen, about O.8 mm long and 1-1. 5mm wide on large rocks (Fi gI.A). This new species occupied
(Fig s2., 3) .Infructescc nsucrcrounded by pcrsistentat lowest part among the rheophytic zone, The
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water color of the stream was chocolate brown and Indoncsia, for their kind arrangements for my fiel dtrip to
similar to water running through keranga sfbTes t(s= Centra lKalimantan M,s. Titie nPraptosoewir ywhoo sup-
heath fbrests), ported my fiel dwork, and Dr. H. Nagamasu, Kyoto
Arbte sT:his new species belongs to the section Universit ywh,o kindl yirnprove dthe Latin descriptions.
(;tiulescenMt.iaHotta(cfBogner & Hay 2000) This study was supported financially by Mitsubishi
FoundationT,bkyo.

according to the placemen tof thecae at the proximal
side of the stamen (Fig 2s, .3) .The shape ofmale References
flowers (stame nclso)sely resembles Aridurum ros-
tratum Bogner et A. Hay, but is a remarkably dif BogrierJ,.& A. Hay,2000,Schismatoglottid(eAaeraceae)

feren tpattern from A. iostratum, or ether spe ¢ies, in Malesia II-Aridarum, Bucephalandra,
The chain 1ik epatter onn the upper surface is unique Phymatarum and Piptospatha. [felope 9a: 179-222.
in the genus. The trinerve lik epattern ofleafbread Okada, H. & Y, Mori. 2000. Tbree new species of
with prominentl tyhickened margin is also a partic- Schismateglottide aAera,ceae, from Bomeo. Acta
ular character in the genus (Fi gI.B). The plant Ts u kaPyhay,t oHta. x&, G eHo. bOokta. d5a1.: 12-090.5. T7iismia mullarensis
size ofthis species is quite small among the species (Burmanniac ae naewe) s,pecies from Muller Range,
ofAridorum and was similar to tha tofA. incavatum Centra lKalimantan A.cta Phytotax G.eobot .56:129-
H. Okada et Y Mori (Okad &a Mori 2000). 133,
Tsukaya, H., M. Nakajima & H, Okada. 2005.

I wish to express my cordial tihan ktso Dn Dedy Darnaedi, Diclymoplexie tclinanaharia (Orchidac eaa neew):
LIPI ,Scientif Aiccademy of Indonesi aI,ndonesi aan,d Dr. species from Muller Range, Centra lKalimantan,
Irawati ,Director of Bogor Botanic Garden, LIPI, Indonesi aA.cta Phytotax. Geobot, 56:207-212.
Received Aiovember 7 ,2005; accepted December 2, 2005
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