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ISSN 1346-7565 Acta Phytotax. Gcobot. 61 (3) 1:27-129 (2011)
Studies Schismatoglottideae(Araceaej XV:
on efBorneo
A Second Species ofBakoa firom Indonesian Borneo
WoNGSIN YENG
Department qf'Plant Science andffnvironmental Ecology, fucully of'Resour Scceienc eand 1lechnoiogy,
Lbeivensi tMitilaysi Saara?vak 9,4300 Satnarahan ,Saraveah Mhrlce,s isayi,vong@frst,unimas,nup
Bakoa brevipedunct{l ait sanewly combined as a second species of the Bornean endemic genus Bakoa
(Aracea eS:chismatoglottide abea)s,ed on llottarum brevipedunculatu mA. new generi cdelimitati teon
Bakoa and a key te the species of Bakoa are presented.
Key words: Bakoa, Bornco, cndemic, Indonesia, KaLimantan Barat
Using a combination of morphological and ously) confirrned that this also belongs in B. bre-
molecu]ar analyses Boyce & Wong (2008 a)nd vipedunculata, Therefore ,Bakoa is redefined te
Wong et ctl .(201 c0on)vincingly demonstratedPi- includ ethe second species, B. brevipechinculata.
ptospatha N. E. Br. sensu Bogner & Hay (2000)
to be polyphyleti Ocn.e result of redefining Pip to- Bakoa P, C. Boyce & S. Y Wong, Bot. Stud. (Tai-
spatha as monophyletic was the recognition ofa pei )49C4) :398 (2008).-1 }Brakpoea: lucens
morphologically high]y distincti vneew genus, (Bogn ePD. C. Boyce & S. YL Wong
Bakoa P. C. Boyce & S. Y. Wong, with one spe- Small rheophytic herbs .Stem condensed,
cies, B, lucens (Bogner P). C, Boyce& S. Y. Wong Leaves several to many together; petioie sheath-
restricted to a single sandstone waterfa11 in Bako ing only at the extreme base, thence extended
National Park, Kuching, Sarawak, and with a sol- into a very narrowly triangular marcescent ligu-
itary C,tElls.enerll164)fromKaliman- lar blade
specimen portion; very narrowly elongate-elliptic,
tan Barat, rather coriaceous; midrib abaxially prominent
Recent herbarium-based work in BO, L & K with 4-6 very fine but well-differentiated (darker
provided access to herbarium material not avail- than surrounding tissue )primary later aveiins on
al]] eto the author during the work leadin gto each side, these hard]y diftferenti aitn etdhickness
Boyce & Wong (2008 i)n,cludin gthe type Hbtta- from the secondary venation and divergin gat ca.
bFevipeduneulatum H. Okada & Y,Mori.On 300; lcss
rum secondary veins adaxially rnore or ob-
examination, this proved to represent a second scure, abaxially fine and rather faint r,unning to a
species efBakoa, diflleri fnrgom B. Iucens by the thickcr marginal vein; tertiar yvenation forming
staminatc flower zone free and completely fertile an inconspicuous tessellate reticulum abaxially.
Brs b,asall yadnatc to the spathe on thc dorsal Injlorescence solitary to three together on a sin-
side, somctimes with only the ventral-most sta- gle shoot; peduncle erect to arching at anthesis
mens trho scxeposed by gaping spathe limb) fer- with the spathe slightly down-turned and the
tile, or more extensively fertil eb,ut always sterile spathe opening ventral, declinat epost anthesis
on the dorsa lside]; and the stigma reaching to al- and during fruitin gE.ipath ewcakly nodding;
most the edge of the gynoecium. Re-examination more or les soblanceelate, hardly constricted,
of Elsener H164 ino tcritically examined previ- with a long apiculate tip. fi??a dadinaxte to the
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128 AcLa?hytotax.Geobot. Vol,61
spathe in t}] elowcr 1!2-2f3 ;female zone corn- beti-shape dto irregular lyrectangular from
pletely adnatc to the spathe on the dorsa lside; above, often with the connective irregularly
ovary depresse dglobose and weakly aRgular, broadcned on one side; thecae each opening
placentation basal ,ovules orthotropous, long- through a conspicuous, broad-rimmed pore.
beaked; stigma sessiie, narrower than, or over- I7>'uiti nsgpathe persistent ,at frui tmaturity very
topping the ovary, button-lik e,papitlate;swiftly drying and thcnce by reflexing of the spa-
interpistil] astraminodes absent from the fernale dix the spathe recurving and opening basall yand
zonc; sterile intersti scoemewhat thickcr than the also tearing at the peduncle insertio tno expose
female zone, dorsall yadnate to the spathe, com- the fruit sat, the same time spathe limb remaining
posed oflarge truncate mostly irregularl ypolyg- distal lcyonvolute and still clasping thc spadix
onal staminodes; rnale zene siibcylindric-ellip- appendix remains; fruitin gpeduncle initially
soid, apically narrowly acute and sometirnes declinat el,atc trwisting through 1800 andbecem-
sterile, basall yfree or adnate to the spathe on the ing arching-erect; berry depresse dglobular; seed
dorsa lsjde; stamens crowded, truncate, dumb- ellipsoid, micropyle blunt ,testa slightly ribbed.
Key to specjes ofBakea
1a .Spadix adnute to thc sp athc on the clors asilde to halfth elengt hofthe staminate flowe rzone, sometimcs with
only the ventral-mosl stamens (thos eexposed by gaping spathe limb) fertil eo,r more extensiyely fertil eb,ut
always sterile on the dorsa lside; stigma button-lik cea,. V3 di am. ofgymoecium. Spathe fu11 ypersisten tinto
fruitin (gse Beoyce & Wong [2008 f]or discussion) ...........,....,..-...,.,."...H.",,.,... .l.u.ce.n,s"...,,.,".,,..."..,,.,,,,B,
lb .Spadix adnate tu the spathe on the dorsa lside onto until the end of the pistill aftieowe rzone; staminate
flowe rzone full yfertil seti;gma disc-lik reea,chirtg Ihc cdge or even slightly everhanging the edgc efthe gy-
noecium. Upper 1/3 of spathe shedding post-anthes (jfsid Oekada & Mori, sec below)
......-.........,..."...,,..."-...,.,..-....,..."...,...,.............,.....................,............"..-,.-.,,,.."......,.,..B.brevipedunculata
Bakoa breviped"nculata (H .Okada & Y. Mori) long, drying brown; blade coriaccous, shining
S. Y. Wong, comb. llev. green ,lanceolate to narrowly elliptic, (7010-18
Basionym: Hbtiarum b"evipeduncuiatuitzH. Okada & Y. cm long ,(1.4-)2 -c2m. 5"fide, the base cuneate
Mori, Acta Phytotax .Gcebot. 51z 7, fig s3 & 4C and somewhat decurrent t,he apex acuminate and
(2000 )7Pi.pfospatha breyipedunculata (H. Okada & apiculate for (2--)4 m-m,6 the margin thickened
YL Mori) Bogner & A. Hay, [[blopea 9(1) :203 (2000), and reeurved; midrib abaxially very promjnent,
-fype: Indonesia, Kalimantan Barat, Putussibau, a somewhat prominent adaxial]y; primary latera)
blriamn cvihlla goe,f upp er13 sJtraena m19 9of2 ,S gH.. K aOpkuaacsl,a S&g. DK.e rKioamua, rSaa- veins not or hardly diffbrentiinactoe ndfsrpoimc tuhoeu sse,c-
3232. 1(holo T-I, n.v.; iso -BOI). ondary venation, adaxially nu-
merous and dense ca. 1 mm apart, divergin gat
Evegreen rheophytic herb to ca. 30 cm tall, ca. 30e and runn{ng to a marginal vein; tertiary
Stem condensed, to ca. 4.5 cm long, O.8-1.5 cm venat{on obseure. Jnj7orescence solitary, erect;
diam, ,with strong roots to 2-3 mm diam, and pcduncle much shorter than the petiol e1,.2･- -cm3
yariously developed smalier roots, but no fine long, 1-1.8 mm diam, SPath wehite at anthesis,
roots. Leaves many togcther, crowded; petiol (e8-) 3--4 cm long ,5-7 mm wide, apiculate fbr 2-3
15-20(-35) cm long ,1.5-2.5 mm diam. ,canalicu- mm, persisten tin the lower ca. 213, thc upper part
lat eadaxially, shcathirig at the extreme base ,the fa11in gafter anthesis (se enote below) E.?)adix
wings of the sheath extended into a narrowly tri- 2.5-･･3 .cm5 long ,sessile; adnatc dorsall uyntil the
angular, rmembranous, ligular portio n1.5-4 cm top of the pistilla tfeiower zone; pistillat .e17bM,er
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zone ca, 5 mm long ,ca. 4 mm diam. ;ovary de- ty?) .However, based on the isotyp eof Hbttarum
pressed-globul acra,. 1,5 mm diam. ;stigma ses- brevipeduneula ttuhmis cannot be verified. In-
sile, discoid, centrally somewh at impressed, ca, 1 deed, the one inflorescenc ewith the spathe par-
mm diam. ;interpistiZl astraminodes absent; ster- tiaSt yshed appears to be the result ofintended re-
ile intenytic eisodiametr iwcith the ferti lzeones, moval to facilita etxaemination of the spadix, Of
ca. 5 mm long ;staminate zone subcylindric, O.8- other mater{al available, both duplicat eosf ELyen-
1, 3cm long ,5 mm diam. ;stamens crowded, not er H164 arc at pre-anthesis ,while the BO and K
regularly arranged, wcakly dumbbell-shaped duplicate Rsidsclal PeBU163 both show signs of
frorn above, fiat-toppe dca,, 1 rnm across, with the spathe limb and upper spadix being broken,
eonspicuous circular pores ;appencfi xtapering to rather than the lirnb having been los tthrough
an obtuse point ,1-1,3 cm long ,basall yca, 5 mm post-anthesisabscission.
diam.; fiat-toppeidr,reg-
staminodes of appendix
ularly polygonal, l-1, 5mm diam. th"uitin gspathe The study visits to the hcrbari amentiened in this paper
2-2.5 cm long ,1-1. 5cm wide, senescence not ob- wcre funded under the author"s ITTO Fellowship Ref.
served; F}'ui atndberry ca. 4 mm diam. ,crowncd 0f2u6nId0e9dA b. yT thhies M iins ipsatrryt ooff aHni gohne-groi nEgduc atreisoeanr,ch Mal wahyisciha biys
with persiste nsttigma remnants; seed subglobu- fundamentalresearchgrantschcmeVbt:FRGSfOl(12)/709f
lar ,ca, 1 × 1 mm, shallowly ribbed, brown, with 2009(25) .Many thanks are extended te the Director sor
a transparent blunt micropylar appendage ca. O,8 Curator sofBO, K, and L to allow access to the materia]
mm long. and to their staffs for kind ly facilitat itnheg observations.
Distributio Inn.donesia nBorneo: Kalimantan
References
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streams in perhumid moist tow]and fores tca,. 100 Bogner, J. & A, Hay. 2000. Schismatoglottid eian eMale-
m asl, sia II-nridantm, Bucqpkaland}" aP,byneatarum and
Piptospatha. 1leIQpea 9(1) :179-222.
ta n BOathreart s.pSeacnigmgeansu, e1xaJmuinleyd.1968 I,NAD.OENLEySenIeAr,Il K18a4li(mKa,Ln)-. B o y cge]o, tPt. iCd.e a& e (SA. rYa, cWeona geo.f) B2o0r0n8c.o S tVuIId:i eS scohno tStcahriusmma tanod-
Kali mantan Tengah. Kual a Rck ut･ -Busang, Muar a Rc- Bakoa, two new genera from Sarawak, Mulaysian
k1u1t4, eP0r6e'jEec,2t3 B Maraiyto lU9l9 u0 b,Ca.seE .caRmipds 'adndot ecPnyBiUro1n6s ,3 (OBOO0 ,2K',S; Ok a dBao,r nHe,o .& B YoLt M. oSrtiu.d . 2(00T0a. iTph re4e9ie: )3ne9w3- 4s0pe4c.ies of Schis-
D. matoglettideae, Araceae ,from Bornee. Acta Phyto-
tax. Geebot 51: i-9,
Wong S,Y.,P.C. Boycc,O, Ahmad Sofiman& C.P.
jVbte ,Okada & Mori (200 0r)eported the Leaw. 201O .Moleeular phylogeny oftribe Schismato-
spathe senescence mechanics to consist ofthe up- glottidea ebased on Lwo plasti mdarkers and recogni-
per 113 ofthe spathe limb shedding post anthesis, tion ofa new tribe, Philonotiea fer,om the neotropics.
with the lower 2f3 persisten tinto frui t(maturi- Taxen, 59(1) :117-124.
Received,inly 21, 2010, 'acceptedIVbvember 26, 20iO
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