Hibiscus or lilac depending on your local.

Humming birds LOVE Hollyhocks, which will continue to bloom as late in Autumn as the hummingbirds stick around. They also adore Fuchsias, Cape Fuchsias (Phygelius), Butterfly Bush (Buddleia), and Red Valerian (Centranthus ruber). I'm sure that this list isn't complete, but the plants above are all easy to grow with minimal care.

Anything with a semi-deep flower. Honeysuckles work, too. Here is a list: Perennials * * Bee balm Monarda didyma * Butterfly weed Ascelpias tuberosa * Cardinal flower Lobelia cardinalis * Columbine Aquilegia sp. * Coral bells Heuchera sanguinea * Cosmos Cosmos sp. * Dahlia Dahlia sp. * Delphinium Delphinium elatum * Flame acanthus Acanthus mollis * Foxglove Digitalis purpurea (Biennial) * Fuchsia Fuschia hybrida * Geranium Pelargonium species * Hollyhock Althea rosea (biennial) * Lupine Lupinus hybrids * Monkeyflower Mimulus hybridus * Penstemon Penstemon sp. * Red hot poker Kniphofia uvaria * Sage Salvia officinalis * Scarlet sage Salvia splendens * Speedwell Veronica hybrids Verbena Verbena sp. Annuals * * Mountain garland Clarkia elegans * Four-o'-clock Mirabilis jalapa * Touch-me-not Impatiens sp. * Flowering tobacco Nicotiana alata * Nasturtium Tropaeolum majus * Petunia Petunia hybrida * Spider flower Cleome hasslerana Zinnia Zinnia sp. Bulbs, corms and tubers * * Tuberous Begonia Begonia sp. * Canna Canna sp. * Gladiolus Gladiolus sp. * Iris Iris sp Montbretia Crocosmia sp. Vines * * Bougainvillea Bougainvillea sp. * Cardinal climber Ipomoea quamoclit * Flame vine Pyrostegia venusta * Honeysuckle Lonicera sp. * Lantana Lantana sp. * Rosary vine Ceropegia woodii * Trumpet creeper Campis grandiflora Trumpet vines Bignonia tagliabuana http://www.thegardenhelper.com/hummingbird.html