Table Of Content

, 618 kmnortheastofthelastreportedsiteforthisspeciesinLouisiana(Pointe aux Herbes). A subsequent investigation at this location on 18 August 1990yieldedfruitingspecimens, andadditionalsmallerbedsoff!perfoli- atiis. VoucherspecimenshavebeendepositedintheherbariaofLouisiana StateUniversity-BatonRouge(LSU78177, LSU78178;Brantley&Piatt s.n.)andUniversityofNewOrleans(NOLS5378).Theexactcauseforthe periodicocc—urrenceofPotamogetonperfoliatuswithinLakePontchartrainis unknown. ChristopherG.BrantleyandStevenG.Piatt, WettandaEcologi- calSennces, P.O. Box 701, Madisoni'ille. LA 70447, U.S.A. ri;|'|;renc:i-;s CHABRECK, R. H. 1972. Vegetation, waterandsoilcharacteristicsoftheLouisiana HAYcoNaEstSa,lrRe.gioRn..1L9o6u8i.siPaontaamSotiaiteleonUniinv.LouAigsriiacn.a.ExPpt.oc.StaL.ouBiuslila.naNoA.cad6.64S.ci.7231pp:.82-90. LESTER,(j. 1988. PlantsandanimalsofspecialconcernintheLouisianacoastalzone. LouisianaNat.HeritageProg.Spec.Publ.No.2.LouisianaDept.Wildl.Eish.,Baton Rouge, 291 pp. iVlAYER,M.S. 1986.ThesubmergedaquaticvegetationoftheLakePontchartrainestuar- MONinTeZs,ystGe.m,NL.oui1s9i7a8na..TMh.eS.suThbemseirsg,eUdnivveegrestiattyioonfNofewLakOerlePaonnst.cha1r0t0rapipn., Louisiana. Castanea43:115-128. OGDEN,E.C. 1943.Thebroad-leavedspeciesofl^oiamoi^elonofNorthAmericanorthof Mexico. Rhodora45:57-105, 119^163, 171-214. RECENT COLLECTIONS OF H—ELIOTROPIUM EUROPAEUM (BORAGINACEAE) FROM TEXAS Helwtropmm europaeum L. is an annualnativetosouthernandcentralEurope,northernAfrica,andregions of the Caucasus and Iran (Johnston I960). In the United States, U. europaeumhasbecomesporadicallynaturalizedalongroadsidesandinwaste placesfromNewJerseytotheCarolinas, southwardtoFlorida,andwest- wardtoTexasandCalifornia(Small 1903;Radfordctal. 1968;Corrclland Johnston 1970;Fcrnald 1970;Munz I968).Thesinglehistoricalrecordof the species fromTexas was a 19th century collection from Hays County (San Marcosand vicinity, Spring 1897, Stanfields.n. (NY)). Inthefallof1989andsummerof1990,H. europaeumwascollectedat threeseparatelocationsinandaroundSanMarcos,Texas.Twoofthecollec- tion sitesweregravel terracesoftheBlancoRiver, wherethespecieswas locallyabundantandgrowinginassociationwithPolanisiadodecandra(L.) DC.,SesbaniamacrocarpaMuhl.exRaf.,EuphorbiaserpensKunth,E. nutans Lag.,Phylanodiflora(Michx.)Greene,Leucosporamultifida(Michx.)Nutt. SiDA 14(4):618. 1991, 619 •indji/sticiaamericana(L.)Vahl. Thethirdsitewasadisturbedflowerbed onthecampusofSouthwestTexasStateUniversityinSanMarcos, where onlyafew individualswerefound. sity,VobuechhmerdsSpaenciSmaebnasH:alTlE,XSAaSn.MaHrcaoyss,C1o2.O:cwtest19c8a9,mpHuustzoif"eSro2u3th(wSeWstXTTeExaXs);St4a.te0UmniivNero-f SanMarcosoncountyroad 14()attheBlancoRivercrossing, 17Oct 1989,Hutzler122 (SMU, SWT);gravel terraceoftheBlancoRiver0.1 mi upstream from the1-35 hwy bridge,NofthecityofSanMarcos, 19Sep 1990,Lemke3^27(NY,SMU,SWT,TEX). Heliotwpium eurnpaemn is readily distinguished from all other Texas species ofHelwtropium by its nutlets, which are typically 4 in number, 1.5—2 —mm long and distinctly tuberculate on the abaxial surface. PatrickL.HutzlerandDavidE.Lemke,Herbarium,Departmentoj Biology, Southwest TexasState Univenity, SanMarcos, TX 78666. U.S.A. RF.i-i;RENc:r.s CORRELL,D.S.andM,C.JOHNSTON. 1970.ManualofthevascularplantsofTexas. TexasResearchFoundation, Renner. 1881pp. FERNALD,M,L. 1970. Gray'smanualofbotany. 8thed. D. VanNostrandCompany, NewYork. 1632pp. JOHNSTON, I.M. I960. Boraginaceae. Pp. 123-221 In:FloraofTexas,vol. 1,C.L. Lundell,ed. TexasResearchFoundation, Renner. MUNZ, P. A. 1968. Supplement toaCaliforniaHora. UniversityofCalifornia Press, Berkeley. 224pp. RADFORD,A.E.,H.E.AHLES,andC.R.BELL. 1968.Manualofthevascularfloraof SMAtLhLe,CaJr.olKi.na1s.903U.niFvleorrsaiotyftohfeNsoourtthheaCsatreorlninUaniPtreedssS,taCthesa.pePlubHlislilh.ed1b1y83thpep.author,New York. 1370pp. Sh5a I4(i);6l9. 1991,