Hierochloe odorata #1 (Sweetgrass)

Sweetgrass is a native, cool-season grass that prefers to grow in wet places. It spreads readily from rhizomes to form colonies of sweet-smelling foliage which retains the characteristic vanilla scent even after it is dried. This is an important ceremonial plant to Native American cultures. The seed heads which appear in late spring dangle daintily over the foliage in a pendulous fashion.

Sources:
Lady Bird Johnson Wildflower Center
Minnesota Wildflowers
USDA Plants Database
Eastern/Central Medicinal Plants and Herbs by Steven Foster and James A. Duke