Lolu uhlobo lwe izitshalo herbaceous noma izihlahla Bayingxenye yomndeni wakwa-Asteraceae, oqhamuka ezindaweni ezisenyakatho nasezingxenyeni eziningi zeNingizimu Melika, nazo ezisabalele kulo lonke elaseYurophu.
Kunezinhlobo ezahlukahlukene cishe Izinhlobo ezingama-30 zezitshalo i-ragweed yonyaka noma engaguquguquki, ekhula ikakhulukazi ezindaweni ezisicaba, enomswakama ophansi nenhlabathi enesihlabathi. Ezinye zezinhlobo ze-ragweed ziyakwazi ukukhiqiza impova eningi futhi ngenxa yokusabalala kwayo kwe-anemochoric kumelela enye ye izimbangela ezinkulu ze-hay fever.
I-Ragweed enamakhambi noma izihlahla imfishane, kepha ezinye izinhlobo Zingakhula zibe amamitha ayi-4 ubude.
Zineziqu ze-hispid ezinomumo oqondile, ongatholwa futhi ezitshalweni eziminyene ezingaba uhhafu wemitha ububanzi namagatsha amise okwe-basal, lapho izimpande zalesi sihlahla zivame ukukhonjwa khona ziyajula impela, okwenza kube nzima ukuwasusa.
Amaqabunga aso ane-bipinnathifid, evuleke ngokuma, anama-petioles avela ezinamaphiko, ane- okuluhlaza okotshani noma okombala osiliva ebusweni beqabunga nangaphansi, okuphambene nesisekelo nangokushintshana phakathi kwamagatsha aphakeme kakhulu esitshalo futhi kulungile ukusho ukuthi lezi zitshalo zine-monoecious, khiqiza ama-inflorescence afana ne-spike asekelwa ngamaqabunga anamathiselwe izimbali zesilisa, anombala ophuzi ngokuluhlaza okotshani, omile okwe-disc zingalinganisa cishe amamilimitha amathathu ububanzi cishe.
Izimbali zesifazane ze-ragweed zinombala omhlophe ngandlela thile, omile kahle, unama-axillaries lokho zitholakala engxenyeni engezansi lezo zimbali zesilisa bese kuthi ekugcineni zingabi nayo ipapo.
Ukukhulelwa ngokobulili kwalesi sitshalo kukhiqizwa ngumoya, okuyizinhlamvu zempova, okubuye kube yisitshalo esisodwa iyakwazi ukukhiqiza inani elifinyelela ku-1.000 billion ngenkathi eyodwa, ngaphezu kwalokho, lokhu kwenzeka ngenkathi enomswakama ophezulu naphakathi nesikhathi sehlobo.
Izithelo ezikhiqizwa yilesi simbozwa ngameva, ezinesimo esifana ne-ovoid, okuyi inembewu eyodwa encane ngaphakathi ngombala onsundu futhi omise okwechopho lomcibisholo. I-Ragweed iyinhlobo yesitshalo engatholakala kuwo wonke ama- izifunda ezipholile zenyakatho yezwe lomhlaba futhi nasenyakatho yeNingizimu Melika.
Yizihlahlana ezikhetha inhlabathi eyisihlabathi kakhulu, enokuzala okuncane, ene- ukwakheka okune-alkaline kancane futhi zingama-photophiles ajwayelekile. Uhlobo lwe-ragweed luzenzela ngokuzenzekelayo emigwaqweni, ezindaweni eziningi zasemakhaya, nasemabhange emifula etholakala emathafeni.
Lesi sihlahlana sisetshenziswa emithini yemvelo ngenxa ye- izakhiwo eziphazamisayo, i-febrifuge ne-emetic enamaqabunga ayo.
Zingasetshenziswa ukwelapha inyumoniya, izifo ezinjengomkhuhlane, isicanucanu, isifo sohudo kanye nezinye ezifana nokuqaqamba kwemisipha. Zingasetshenziswa nangaphandle ukumelana nokulunywa yizinambuzane futhi ijusi lazo linezinto ezithile zokubulala amagciwane ezingasetshenziswa ekwelapheni izilonda okungenzeka ukuthi zitheleleke nganoma yisiphi isizathu.
Ngendlela efanayo, izimpande zesitshalo lapho zomile, ingasetshenziswa ukulungiselela ukumnika, ukuzisebenzisa ngale ndlela ekwelapheni iziyaluyalu ezingaba khona esikhathini nokushaywa unhlangothi. Kufanele futhi kuthiwe impova ye-ragweed isetshenziswa yimboni eyenza imithi ukulungiselela imithi ukulwa nezimpawu zokungezwani komzimba.