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.
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).