15 September 2003.
Iowa, United States
Locality: Backbone State Park Cave near Strawberry Point, T90N, R6W NE corner of NW 1/4 of SW 1/4 of Sec. 4, Delaware County
Coordinates: 42.6369, -91.5619
(Map it)
Elevation: 317m.
Georeference protocol: Lat/lon determined by GPS
Habitat: Wild Habitat
Environment description: Alluvium below limestone cave. Nearly full shade. Slight slope w/ SE aspect. Loam soil w/ some stoniness, good drainage
Number of plants sampled: 17
Associated species: Celtis occidentalis, Quercus macrocarpa, Urtica sp., Polygonum virginianum, Ulmus rubra and Alliaria petiolata
Comment: Occasional population abundance. 15-20 plants sampled; 50 plants found.
Collector(s):