Quick answer: 19 native Alaska plants have a recorded bloom range that includes May.
19 species
- Balsam poplar Populus balsamifera · 1 states
- Beach strawberry Fragaria chiloensis · 1 states
- Bearberry Arctostaphylos uva-ursi · 16 states
- Bog Labrador tea Ledum groenlandicum · 4 states
- Bog laurel Kalmia polifolia · 5 states
- Broadleaf cattail Typha latifolia · 11 states
- Bunchberry Cornus canadensis · 7 states
- Canada wild rye Elymus canadensis · 18 states
- Engelmann spruce Picea engelmannii · 1 states
- Marsh marigold Caltha palustris · 8 states
- Nootka rose Rosa nutkana · 1 states
- Quaking aspen Populus tremuloides · 24 states
- Red huckleberry Vaccinium parvifolium · 1 states
- Red-osier dogwood Cornus sericea · 22 states
- Salmonberry Rubus spectabilis · 1 states
- Sitka spruce Picea sitchensis · 1 states
- Water birch Betula occidentalis · 1 states
- Western columbine Aquilegia formosa · 1 states
- Winterfat Krascheninnikovia lanata · 6 states