NEW COMBINATIONS IN ARTEMISIA (ASTERACEAE: ANTHEMIDEAE)

2005·1.2 MB·English

by  Leila M Shultz

NEWCOMBINATIONSINARTEMISIA
(ASTERACEAE:ANTHEMIDEAE)
LeilaM.Shultz
UtahStateUniversity
Logan,Utaii,84322-5230,USA.
[email protected]
ABSTRACT
Twocombinationsareproposed:Artemisiaarbusculasubsp.hngiloha(Osterhout)ShultzandArte-
misiaglohulariasubsp,lulea(Hulten)Shultz.Artemisiaglohulariasubsp.luteaislectotypilied.
RESUMEN
Seproponendoscombinaciones(Artemisiaarbusculasubsp.longilohayArtemisiaglohulariasubsp.
lutea)yselectotipificaArtemisiaglohulariasubsp.lutea.
Taxaforwhichnewcombinationsarehereproposedareincludedintheforth-
comingtreatmentofArtemisiaintheFloraofNorthAmericaNorthofMexico
(Shultz2005).Bothcombinationsalreadyexistatvarietalrankbuttheyare
madehereatsubspecificrankforbetterconsistencywithtraditionalusagein
thegenus(e.g.,Shultz1983,1987)andwiththeFNAtreatment.
Artemisia arbusculaNutt.subsp.longiloba(Osterhout)Shultz,comb.nov.
Basionym:ArtemisiaspiciformisOsterhoutvanlongilohaOsterhout,Muhlenbergia4:69.1908.
Artemisialongiloha(Osterhout)13eetle,Rhodora61:84.1959.Artemi.siaarbusculavar.langiloba
(Osterhout)Dorn,Vase.PI.Wyoming295.1988.Seriphidiumarhusculum(Nutt.)W.A.Weber
subsp.longilobum(Osterhout)W.A.Weber,Phytologia55:7.1984.TYPE:U.S.A.COLORADO.
GrandCo.:SulphurSprings,Osterhout3592(holotype:GH!).
Artemisiaarbuscula.isoneotthemoreperplexingspeciesinArtemisiasubg.
Tridentatae.Anatomicandmorphologiccharacteristics(leafphenologyand
sizeofheads)suggestmultiplehybridoriginsanddifferentparentaltaxafor
thesubspecies(Shultz1987).Thephenologyofleavesonfloweringplantsinan
otherwiseevergreenspeciessuggestsahybridorigminvolvingspeciesoftheA.
tridentataandA.canalineages.Inmostinstances,populationsofA.arbuscula
appeartobestableandself-reproducingfromfullyfertileseeds.
ArtemisiaarbusculaoccursthroughoutwesternNorthAmerica,prima-
rilyasisolatedpopulationsinCalifornia,Colorado,Idaho,Montana,Nevada,
Oregon,Utah,Washington,andWyoming.Artemisiaarbusculasubsp.longiloba
differsfromothersubspeciesofA.arbusculabyitsdistinctiveleaflobingand
earlybloomingtime.ItistheonlymemberoftheTridentataecomplextobegin
floweringassoonassnowmeltsinearlyspringanditisecologicallydistin-
guishedfromothersubspeciesbyitsoccurrenceatlowerelevations,infine-
SIDA21(3):1637-1639.2005
1638 BRIT.ORG/SIDA21(3)
grainedclaysoils.Morphologicalcharacteristicsthatseparatesubsp.longiloha
fromsubsp.arhusculaareitssmallerheads(2-3mmdiam.asopposedto3-4.5
mm);subsp.longilobaisseparatedIromsuhsp.thermopolabyitsshallowlylobed
leaves(lessthan1/2theirlengths)asopposedtodeeplycleitleaves(morethan
1/2then-lengths).
Iproposedthetaxonomicstatusadoptedheremmydoctoraldissertation
(Shultz1983).Osterhoutfirstrecognizedthe'longiloba'morphologicalform;
heconsidereditavariantofArtemisiaspiciformis,aspeciesthatalsoappears
tobeot hybridorigin.BecauseA.arbu:>culasubsp.longilobaoccurssporadi-
callyinthehitermountainwestandexhibitsabroadrangeol morphological
variation,1havehesitatedtoformalizeitsstatus.Twentyyearsoladditionalfield
workhavehelpedtoconlirramybeliefthatthistaxonshouldberecognized
butwiththecaveatthatitmaybederivediromdilferenttaxonomiclineages
(atsubspecilicrank)indifferentpartsofitsrange.ThetaxondescribedasA.
arbusculasubsp.longicaulisA.H.Winward&R.D.McArthur(1995)maybea
polyploidderivativeoftheArtemisiaarbusculacomplex.Thiscomplexcon-
tinuestopresentaninterestingpuzzlethatinalllikelihoodrepresentsapat-
ternotreticulateevolution.
ArtemisiaglobulariaChamissoexBessersubsp.lutea(Hultcn)Shultz,comb.
nov.B,'\.sioNVM:Ailcmi^iaglobiilailavanluteaIlultt-n,ArtaUniv.Lund2,46:1567.1950.Ar-
teinisuiglohiiliiiuiI,hitcii(.Mullen)15.Boivm.NaturalistsClanad.94:632.1967,Tvpr.:U.S.A.
Alaska:St.MatthewIsland.I6jul1938./.i^AniicT.son4tV7U-l-:c:TOTYPH:.S,hereformallydesig-
nated).SelectedbyD.HMurrayin1981.whostudiedallthematerialavailabletoMullenatS.
TheA\ndersoneolleetionistheonlyoneofthesyntypcsmHultcn'sherbariumandthusthe
tin!}'onehecouldha\'ehadbciorchimatthetimeolwritmgtlicdescription.
Ascurrentlycircumscribed,Artemisiaglobulariasubsp.luteaisknownonly
from Alaska.ItiscommononSt.MathewIsland,infrequentonsurrounding
islands,andofconservationconcern.Thebrightyellowcorollaswithorange
glandsdistinguish it from subsp.globularia, which hasreddish-black,
eglandukircorollas.Itisunusualtohavesuchdistinguishingcharacteristicsat
thesubspecieslevel.Hivenetal.(2004)documentedmultiplechromosomeraces
withinA.globularia,suggestingneedlorturtherstudytodeterminerelation-
shipsofthistaxon.
ACKNClW1,EDGMHNT.S
Thisresearchhasbeensupported,inpart,byagranttotheauthorfromthe
USDAForestService.SpecialthanksareextendedtoDavidF.MurrayKanchi
Gandhi,andtwojournalreviewersforcommentsonthismanuscript,andto
LucBrouilletforhiscommentsonthedraltmanuscripttorFloraot North
AmericaNorthofMexico.Curatorsof theGrayHerbarium(GH)ofHarvard
University,theTntermountainIIcrbarium(LJTC)ofUtahStateUniversity,the
SHULTZ,NEWCOMBINATIONSINARTEMISIA 1639
SwedishMuseumofNaturalHistory(S),andtheRockyMountainHerbarium
(RM)oftheUniversityofWyommgprovidedaccesstocollectionsanddatabases.
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