Hi Laura.

I'm delighted to hear that you want plants that will support local pollinators--they have an acute need for help.  To accomplish that, the Extension strongly encourages gardeners to grow native plants, because they grow well with minimal maintenance and they provide the most benefit to bee, butterflies, caterpillars, and other pollinators and wildlife. The U.S. Fish & Wildlife Service has published a terrific booklet listing hundreds of plants that are native to this area, and it's available at https://www.fws.gov/chesapeakebay/PDF/resources/Native-Plants-for-Wildlife-Habitat-and-Conservation-Landscaping.pdf

On page 71 you'll find a list of plants that provide stabilization on dry slopes, albeit sunny ones.  I suggest you review the listings and look for specimens that tolerate some shade.  One of the herbaceous plants, for example, is Baptisia tinctoria, yellow wild indigo.  You'll see in its individual listing on page 20 that it tolerates partial sun.  

As noted on page 71, any plant that will do well on level ground can also be planted on a slope.  For shady areas, ferns are always an excellent choice.  Dryopteris marginalis, marginal fern, is very highly recommended in general, is evergreen, and its moisture requirements are dry or moderate.

Sedges are also excellent choices for shade. Carex pensylvanica, Pennsylvania sedge, is particularly highly regarded, is semi-evergreen, and it's moisture requirements are dry or medium.

Both ferns and sedges are on the short side, so if you're looking for plants that are larger take a look at the section on shrubs.  You'll see many plants that tolerate shade, including some native azaleas and rhododendrons.  Although I haven't grown them myself, two plants I have heard good things about are Kalmias latifolia, mountain laurel (the state flower of Pennsylvania), and Cephalanthus occidentalis, button bush. Both are deer resistant, pollinator friendly, and they will look different than the azaleas and rhododendron you see everywhere else.

Many of the shrubs listed in the booklet also retain visual interest in the fall either through their foliage or berries. For example, Ilex verticillata, winterberry, is renown for its profusion of red berries in the fall and winter. Consider also virburnum.   Viburnum acerifolium, maple-leaved arrowood, is on the shorter side, while Viburnum dentatum, southern arrowood, is a bit taller.

Best of luck.

Bob