Research articles NAT. HIST. BULし SIAMSoc. 50:(1) 3-6， 2002 NOTES ONT HAI HEDYOTIS (RUBIACEAE) よF.Maxwell1 ABSTRACT Two species of Hedyotis from Ubon Ratchatani Province訂ediscussed，vi z. Hedyotis bahaii Maxw.，sp . nov. and Hedyotis ternata (Pierre ex Pit.) Maxw.，c omb. nov.，a n ew record for ThaiJand Key words: new record，τ'haiJand，He dyotis bahaii，H edyotis ternata ， Hedyotis bahaii Maxw.sp.nov. Herba as etis patentibus capitiformis in caule et inflorescentiae vel nodis quoque receptaculi parte superiore，fo liis angustis marginibus revolutis distinguendum. Herba annua，g racilis，g labra，1 3-20 cm alta; caule erecto，q uadrangulari; folia linearia，m argina revoluta，4 ー7.5xc . 0.5 mm，se ssilia; stipulae tringulatae，o vatae，ap ice acuto，c. 1.25 mml ongae; inflorescentiae terminales，la xe cymosae，1. 75-3.75 mml ongae; flores 4・meri，c. 5m mlo nga;・receptaculumc. 0.5 mml ongum，ca lycis segmenta lanceolata， acuω，c. 1.5m ml onga; corollae hypocrateriformes，pa llidae purpureae; tubus c. 2m m longus; lobi c. 2.25 mml ongi，1. 4m mla ti; nodi caulis et cymae eta receptaculi lobis extra ad basin dense pilis capitatis 0.5 mml ogis instructi. Capsula acuta，c aかcislobis duplo longiora，l oculicide dehiscentia; semina nigrescentia，c. 0.25 mmd iam. Type: Greijmans 40; holotype CMU，is otypes BKF，L. Paratypes: Thailand: Gre討mans166 (16 September 2001)， same location as Type; CMU，B KF，L ，C AS，M O，A . Laos: Greijmans 218; ChnpasakProvince，S anna Somboun 釘 District，a long road no 13，3 5 kmn orth of Pakse，b ordering Phu Xieng Thong Nationa1 Biodiversity and Conservation Area，B an Nakaam; 210 m，2 6 CMU，L ，N ationa1 University of Laos (Dongdok) Location.-Bahai village，U bon Rachatani Gene Conservation Station，H uay Yang Subdistrict，K hong Chiam Dis凶ct，Ubon Rachatani Province; between km 12-13 a10ng highway 2112 (Khong Chiam-Kemrat); 9N ovember 2000. Habitat.一一open，seasonally xeric，de graded deciduous dipterocarp forest with ac anopy to 25 m high; level area，1 20 m elevation，sa ndstone bedrock; soil thin，li ght grey sand with large，fl at outcrops，s easona11y inundated and swamp-like (Fig. 1). Distinguishing features of the species.__:百lespreading，ca pitate-like (colleters) setae on出estem and inflorescence/infructescence nodes as well as on the upper part of the ovary; and narrow，li near，se ssile leaves with revolute margins are diagnostic. lCMU Herbarium，Bi ology Department，Fa culty of Science，Ch iang Mai University，Ch iang Mai 50200，T hailand Received 20 August 2001; accepted 22 Februy2002 釘 3 4 J. F. MAXWELL Etymology.一“ba"is the local name for this kind of open，d egraded，f ire-damaged， seasonal deciduous dipterocarp forest;“hai"= ceramic jars in which fish emixed with 訂 salt to produce af ermented fish paste. Vemacular: Kloteding (Dutch). Slender annual，de licate，g round herb，1 3-20 cm tall，g labrous in all p tsexcept on 紅 the stem and inflorescence nodes as well as the upper part of the receptacles which are densely covered with spreading，ca pitiform setae 0.5-1.5m ml ong; stipules白血，adpressed， ovate，a cute，c. 1.25 mml ong，m argins most1y with 1o r 2c apitate-like setae; leaves opposite，we ll-spaced; blades linear，ti p acute，ma rgins revolute when句，4ー7.5xO.5 mm (when dry)，se ssile; inflorescence terminal，c ymose，la x，1. 75-3.75 cm long; esslender， 蹴 pedicels 4-6m ml ong; flowers numerous，4 merous，c. 5m ml ong; receptacles c. 0.5 mm ・ long，c alyx lobes lanceolate，a cute，er ect，w ith scattered raphids，t otallength c. 1.5m m; corolla hyopcrateriform (salveriform)，li ght purple; tube 2m ml ong; lobes elliptic，ac ute， c. 2.25 x1 .5m m; stamens inserted at the base of and altemating with the corolla lobes， included in the corolla; anthers c. 0.75 mml ong，f uaments c. 1.5 mml ong; stigmas puberulous，c. 1.75 mml ong，b ranching from the corolla throat; style c. 2 mml ong; capsules acute，h alf as long as the calyx lobes，l oculicidally dehiscent; seeds orbicular， slightly compressed，f mely rugose，b lack，c. 0.25 mmd iameter. ， He dytois ternaω(Pierre ex Pit.) Maxw.comb. nov.; New Thai Record Oldenlandia ternata Pierre ex Pi ，.tFl. Indo-Chine 3: 1( 1922) 122-123. FuKUOKA's (1970) revision of Hedyotis for Thailand does not have any mention of 血isspecies. CRAIB (1932) not，自由atOldenlandia ternaωPierre ex Pit. w錨 found，according to PITARD (1922)，by 百lOrelat Kemarat which was previously in Ubon Rachatani Province， 百lailandand is now凶AmnatCharoen Province，a long the Mekong River. It is also known from the southem part of Champasak Prov泊ce，Laos; Stung Treng and Kompo曲 Chenang Provinces，C ambodia; and in Dong Nai Province，n orth of and close to Saigon in Viet Nam. All of the collections noted from Cambodia and Laos are from the Mekong River area. CRAm (1932) indicated that出isspecies，a ccording to his generic concepts of Hedyotis and Oldenlandia，wo uld be included in the former. He did not make ar ecombination since he，a pparently，d id not examine any relevant material. Oldenlandia and Hedyotis were formerly separated on the fine and often conflicting details of the fruiting calyx，m ode of dehiscence，a nd seed mo叩hology.Various authors have either maintained the two genera or united them under Hedyotis. FuKUOKA (1970) combined Oldenlandia with Hedyotis following BACKER & BAKHUIZEN V.D. B悶NKin the Flora 01 Java (1965) who were the first to do so in regional floras for Asia. PπARD (1922) provides al ong and detailed description for血isspecies which is based on unpublished notes by Pierre. It is as lender，a nnual，e rect，g labrous herb with light green，qu adrangular stems. The leaves are in whorls of three (temate)，se ssile，wi th linear， light green blades with revolute m紅gins，mostly 15-18 x1 m m( when世y).Thet erminal cymes have many 4-merous，re gul釘 flowersC; 5m ml ong.百leinflorescence axes and calyx range from white-light greenish to green，c orollas white-lilac outside and white inside，a nthers pu甲le，and the stigmasぽewhite to purple. Gre討mans23 (9 November 2000) and 103 (31 July 2001) were bo白 collectedin the same place c. 2k mS Wo f Bahai NOTES ONT I-IAI/ -/EDYOTlS( RUsIACEAE) 5 Figure 1. Habilal of /-/edyolis !Jahaii Maxw.w ith UlriclIlaria !Jifida L. var. bifida (yellow corollas)，U lricularia de/phinioides Thol ω.p巴1.1(blll巴corollas)(Lentiblllariac巴a巴)， Eriocallloll qllinqlladrallglllareし (Erio call1acea巴)，growing on thin soil with sandslone olllcropS. Martin Greijmans，9 Novel1lber 2000 :.r，" ..V的~匂.' 川....'J1S.J.r'f-. :目 ..引/"n .0，'_. '、白'.-~斗;":;jr.'ー.>."'.主者'; 、1ら'正.i.......:二・ =.'~ーしヶ，.-;-.{": f.~t i'>:ミiよ:て1•， 、Hー• ，'"t'一( ;._. ，.，:;'マ.~ .、、.:... ，. ~;..:・γdι ty・ι .\川V' Figllre2 .H abitat of Hedyolisl e/"llalllS (Pi巴rree.r Pi.r) Maxw. with I巴lalivelydeeps andy soilin a seasonally bllrn巴darea.A ssociated species inclllde Dillenia hookeriP ierre (Dille- nia ceae;f OI巴grollnd)，Call1llarega川 spa・ Ihulifolia Tirv. (RlIbiaceae; l1liddl巴)，出ldvery d巴gracl巴dmixed evergl巴en+ deciduous， seasonal，h ardwood foresl( backgrollnd) Martin Greijl1lans，3 1J lIly 2001 6 J. F. MAXWELL village，K hong Chiam District，U bon Rachatani Province-the only material of this very interesting and distinct speci that1h ave examined. It is locally known as “dtong hang" 回 (例制LL'VI\I)and is common.百lehabitat is similar to that of Hedyotis bahaii Maxw.，bu t with sandy soil at least 30 cm deep (Fig. 2). Specimens are in CMU，B KF，a nd L. Both species of Hedyotis discussed here are similar in having as lender basic habit; linear，s essile leaves with revolute margins，a nd cymose inflorescences with numerous flowers c. 5m ml ong. The collecting area should be thoroughly sampled throughout the year since it may have more unusual or rare plants growing there. ACKNOWLEDGMENTS 1w ould like to thank Martin Greijm s，formerly from the Silvicultural Research 叩 Division，Ro yal Forest Department，B angkok for not only giving all of his collections from the Ubon Rachatani Gene Conservation Station to me for identification，b ut also for his cooperation in providing information about Bahai village and the collecting habitat. Dr. J. F. Veldkamp，N ational Herbarium of Netherlands at Leiden is thanked，a s always，f or his continued support and correction of my Latin diagnosis. Dr. Hugh Tan， National University of Singapore，pr ovided some background information about the historical aspects of Oldenlandia and Hedyotis，fo r which 1a mv ery grateful. Rungtiwa Panyayod is thanked for typing the final version of the manuscript in computerized format. REFERENCES BACKER，C. A.，A ND R. C. BAKHUIZ聞 VANDEN BRINK JR. 1965. Flora 01 Java II，2 84-288. CRAIB，W . G. 1932 Florae Siamensis Enumeratio 11.百leSiam Society，B angkok，Th ailand: 49. FUKUOKA，N. 1970. Contributions to the Flora 01 Southeast Asia III. Hedyotis (Rubiaceae) of Thailand. Tonan Ajia KenわIU(引leSoutheast Asian Studies) 8(3): 305-336. PITARD，J. 1922. Rubiace氾sin Flore Generale de L' Indo-Chine III: 122-123