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Bull. nat. Hist. Mus. Lond. (Bot.)25(2): 123-125 Issued30November 1995 A new species of Odontorrhynchos (Orchidaceae, Spiranthinae) from Bolivia DARIUSZ L. SZLACHETKO Gdansk University, DepartmentofPlantEcology andNature Protection, 80-441 Gdansk, At. Legionow 9, Poland CONTENTS Introduction 123 OdontorrhynchosmonstrosisSzlach 123 References .125 . SYNOPSIS. AnewspeciesofOdontorrhynchos, O. monstrosisSzlach., isdescribedfrom Bolivia. INTRODUCTION below Quime, near bridge in gorge, 18 April 1949, Brooke 5498 (BM-holotype). Fig. 1. The genus Odontorrhynchos includes five species found Stem 54.0 cm high, 7.0 mm in diameter at base, 3.5 mm in mainly in the subtropical zone of South America and the diameter below inflorescence, erect, stout, glandular above Andes. It was described by Correa (1953), based on Stenor- one-fifth, densely along inflorescence, covered by cauline rhynchoscastilloniiHaum. Garay(1982) added afurtherfour bracts. Leaves 4, forming a basal rosette, separated from the speciesto the genus. flowering stems, petiolate; petiole up to 10.0 cm long, Odontorrhynchos is closely related to Brachystele Schltr., narrow; bladeupto 15.0cm longand4.5cmwide, oblong-to from which it differs primarily in the structure of the rostel- elliptic-lanceolate, acute. Caulinebracts 10, herbaceous, with lum and viscidium. The rostellum in Odontorrhynchos is hyaline margins, tubular, acute, lower and middle longer ligulate, rounded at the apex, with a large, oval viscidium on than, upperaslongasinternodes, middleandupperminutely its inner surface which, after slipping from the rostellum, anddenselyglandularatmargins. Inflorescence 18.0cm long, leaves three teeth ofdifferent size. The central tooth is large many-flowered, multi-lateral, dense, cylindric. Floral bracts mm and slightly receding in relation to the lateral ones. In 14.0 long, ovate-lanceolate, acuminate, 3-nerved, herba- Brachystele, the rostellum is small and frequently wedged ceous, densely glandular along margins, glabrous in the between the robust lateral stigma lobes. A small viscidium centre, lower longer than, upper shorter than flowers. Flow- arisesontheexternalsurfaceoftherostellumwhichisgreatly ers medium-sized, subsessile, tubular, densely glandularout- lingually introverted outwards and so appears to arise on the side, green. Pedicemlm1.0 mm long,mtmwisted. Ovary 9 mm long. internal surface. The rostellum remnant is notched or Dorsal sepal 8.2 long, 5.2 wide, triangular-ovate, reduced to a thin, rapidly drying, membranaceus fovea. cuspidate, 3-veined, fleshy, concave in the centre. Lateral Apart from this, Brachystele usually boasts a well formed sepals 9.0 mm long, 3.5 mmmwimde, oblong-fmalmcate, cuspidate, column foot and oblique bases ofthe lateral sepals, whereas 3-veined, fleshy. Petals 8.0 long, 2.0 wide, spathu- in Odontorrhynchos, the column foot is reduced and the late, acute, single-veined, free from dorsal sepal, flesmhym, basesofthe lateral sepals are straight. sparsely glandular along the outside margins. Lip 9.0 mm So far, only O. chlorops (Rchb.f.) Garay has been long, 5.5-6.0 wide, sessile, elliptic-oval in general out- recordedfromBolivia. Anew, previously undescribedBoliv- line, with no constriction, fleshy, thinner at apex, concave at ianspecieswasfoundamongherbariummaterialofthisgenus the base, and with two horn-like appendages near the basal deposited atTheNatural History Museum. lobules, pleated and crenated in apical part, with two fleshy crests in the centre, completely free from one another or fused together at their apices; lip smurmface papillate outside andinthecentreinside. Column3.0 long,erect, massive; ODONTORRHYNCHOS MONSTROSIS column foot 3.0 mm lonmg,mshort, massive, oblique, adnatemtmo SZLACH. the ovary. Anther 2.6 long, ovate. Rostellum 1.2 long, triangular, rounded at apex, 3-dentate after removal of viscidium, the middle tooth the longest, lateral teeth short, mm Planta habitu ad O. chloropsem vergens, sed labello indiviso reduced. Viscidium 1.5 long, oval, massive. ienpfliocrismcaamrnhousiicsSdpuiorabnutshijdaimsidmiilgin,osvcaelnddeai.ncTryapsesa:toB,oliinvicae,ntfraer ETYMOLOGY, monstrosus (Lat.) - monster; in reference to TheNaturalHistoryMuseum, 1995 D.L. SZLACHETKO BROOKE 5498 Fig. 1 OdontorrhynchosmonstrosisSzlach. a: flowerandfloralbract; b: dorsalsepalandpetal;c: lateralsepal;d: lip, flattened;e: cross sectionoflip; f: column, bottomview;g: rostellumremnant. Eachscaleindicates 1 mm. (Drawnfromtheholotype,TheNaturalHistory Museum). the lip shape, which isreminiscentofthe head ofa monster. two, small, fleshyprocessesleaningtowardsthe mainvein. 0. monstrosis appears to be most closely related to O. chlorops Odontorrhynchos monstrosis is known so far only from the (Rchb.f.) Garay, sharing a verysimilarhabit. type collection, which was found 1828 m above sea-level, among rocks by a river in a warm gorge. It differs from all oamupnteichrcoeganrlestkparnatiroctttw,henedw,iastppeheellcxtiipweotsoricirf-nloevemtasahlhieyinngrfiegrdneegunees.esrAbainltytotihuthsteellicbinepaens,tserhpeaol,pfeeaw,tthheiewdchlhiiinpcmhatarhiyees CfAaoruCrerKatNgthiOoevWreLhnooEsftDpoGittEhPaerMloEifGtN.eyTnDSderu.rrahilanbIgH.emwrRiyybssahpzreairtrousdomneOaaxctlphrTvyeihrssiesat.NfmAoarytsutruhaaseplupaLrlHae,itcsiisntapoettrciryioaannMlsluttasohtiaeontunkh.mse NEW SPECIES OF ODONTORRHYNCHOSFROM BOLIVIA 125 REFERENCES Correa,M. N. 1953. UnnucvogeneroycuatroespeciesnuevasdeOrquideas argentinas. Darwiniana10(2): 157-160. Garay, L. A. 1982. A generic revision ofthe Spiranthinae. Bot. Mus. Leafl. Harv. Univ. 28(4):278-425.