24 May 2019.
Honshu, Japan
Locality: Nagano Prefecture, Shimoina District; Achii; Bicchuubara, in woods owned by Mrs. Noguchi.
Coordinates: 35.4287, 137.7494
(Map it)
Elevation: 612m.
Georeference protocol: Lat/lon determined by GPS
Habitat: Wild Habitat
Environment description: Mesic forest fed by natural springs and with many small (and old) canals diverting water; large Cryptomeria and Acer pycnanthum comprising much of the canopy; rich understory below. Soil organic and humusy over brown loam.
Associated species: Alnus japonica; Arisaema sp.; Cardiocrinum cordatum var. cordatum; Clethra barbinervis; Helwingia japonica; Hydrangea paniculata; Magnolia obovata; Mitella furusei; Osmundastrum cinnamomeum; Parthenocissus tricuspidata; Viburnum erosum; Viburnum plicatum var. tomentosum; Veratrum stamineum.
Comment: Large trees, broadly vase-shaped, generally branching at 3 m in height; height 20 m, DBH 64 cm. Bark gray-brown and flaky, peeling in long strips, much like Acer saccharinum. Leaf blades ovate, 5-7 cm in length, mostly 3-lobed with central lobe being longer, serrate margins, quite glaucous abaxially, borne on long (5 cm) reddish petioles. Samaras 2-3 cm in length, pinkish-tan, borne on long (7-8 cm) peduncles; a few still on two trees, most dispersed.