Kalmar "Family Equisetaceae" tana nufin dangin ciyayi na tsiro da aka fi sani da horsetails ko scouring rushes. Wannan iyali ya ƙunshi kusan nau'ikan tsire-tsire masu rai guda 15 masu kama da fern waɗanda aka siffata su da faɗuwar ciyayi, dunƙule mai tushe da ƙananan ganye masu kama da sikeli. Horsetails tsire-tsire ne na jijiyoyin jini kuma suna haifuwa ta spores maimakon iri. Ana yawan samun su a wuraren zama masu jika, irin su marshes, swamps, da gefen rafuka da tafkuna.