L. siphilitica has blue flowers and is primarily pollinated by bees, whereas L. cardinalis is red and is primarily pollinated by the ruby-throated hummingbird (Archilochus colubris).
ˈɛl. sˌaɪfɪlˈɪɾɪkə hɐz blˈuː flˈaʊɚz ænd ɪz pɹaɪmˈɛɹᵻli pˈɑːlᵻnˌeɪɾᵻd baɪ bˈiːz, wˈɛɹæz ˈɛl. kˌɑːɹdɪnˈɑːliz ɪz ɹˈɛd ænd ɪz pɹaɪmˈɛɹᵻli pˈɑːlᵻnˌeɪɾᵻd baɪ ðə ɹˈuːbiθɹˈoʊɾᵻd hˈʌmɪŋbˌɜːd ˈɑːɹkɪlˌɑːtʃəs kˈɑːluːbɹˌɪs.