| betula platyphylla | | USA: Maryland, Edgwater, Smithsonian Environmental Research Center, Block 16, 64 NDNW | | 822885402 |
| betula platyphylla | | USA: Maryland, Edgwater, Smithsonian Environmental Research Center, Block 16, 64 NDNW | | 825715095 |
| betula platyphylla | | USA: Maryland, Edgwater, Smithsonian Environmental Research Center, Block 16, 64 NDNW | | 825715346 |