Species that are part of the Nectar Connectors campaign:

Download phenophase photo guides to help you with identiying flowering of a subset of these species, available on the New York Phenology Project website. 

Blazing stars:

tall blazing star (Liatris aspera)	pinkscale blazing star (Liatris elegans)	dense blazing star (Liatris spicata)

Asters:

white heath aster (Symphyotrichum ericoides)	New England aster (Symphyotrichum novae-angliae)

Goldenrods:

Missouri goldenrod (Solidago missouriensis)	wrinkleleaf goldenrod (Solidago rugosa)	seaside goldenrod (Solidago sempervirens)	wand goldenrod (Solidago stricta)	bog goldenrod (Solidago uliginosa)

Lupines:

arctic lupine (Lupinus arcticus)	broadleaf lupine (Lupinus latifolius)	bluntlobe lupine (Lupinus obtusilobus)
sundial lupine (Lupinus perennis)	Coulter's lupine (Lupinus sparsiflorus)	bigleaf lupine (Lupinus polyphyllus)

Bee balm/bergamot:

scarlet beebalm (Monarda didyma)	wild bergamot (Monarda fistulosa)

Thistles:

Canada thistle (Cirsium arvense)	cobwebby thistle (Cirsium occidentale)	bull thistle (Cirsium vulgare)

Joe Pye Weeds:

spotted joe pye weed (Eutrochium maculatum)	trumpetweed (Eutrochium fistulosum)

Milkweeds:

spider milkweed (Asclepias asperula)	heartleaf milkweed (Asclepias cordifolia)	bloodflower (Asclepias curassavica)*
woollypod milkweed (Asclepias eriocarpa)	poke milkweed (Asclepias exaltata)	Mexican whorled milkweed (Asclepias fascicularis)
pinewoods milkweed (Asclepias humistrata)	swamp milkweed (Asclepias incarnata)	fewflower milkweed (Asclepias lanceolata)
broadleaf milkweed (Asclepias latifolia)	pineneedle milkweed (Asclepias linaria)	savannah milkweed (Asclepias pedicellata)
aquatic milkweed (Asclepias perennis)	purple milkweed (Asclepias purpurascens)	showy milkweed (Asclepias speciosa)
rush milkweed (Asclepias subulata)	horsetail milkweed (Asclepias subverticillata)	prairie milkweed (Asclepias sullivanti)
common milkweed (Asclepias syriaca)	butterfly milkweed (Asclepias tuberosa)	whorled milkweed (Asclepias verticillata)
green antelopehorn (Asclepias viridis)

*Note that this species is considered invasive in some locations

Other:

Lanceleaf tickseed (Coreopsis lanceolata)	Black-eyed Susan (Rudbeckia hirta)	eastern purple coneflower (Echinacea purpurea)
common sunflower (Helianthus annuus)	purple prairie clover (Dalea purpurea)	cardinal flower (Lobelia cardinalis)
golden zizia (Zizia aurea)	eastern baccharis (Baccharis halimifolia)
common buttonbush (Cephalanthus occidentalis)

To see which species are available in your state, go to The Plants and Animals page, and filter for your state and Nectar Connectors Campaign (under Plant Type).