10 October 2020.
Marion County, Iowa, United States
Locality: On the SE side of Lake Red Rock near the town of Pella. The area is administered by The US Army Corps of Engineers.
Coordinates: 41.3803, -92.9727
(Map it)
Elevation: 238m.
Georeference protocol: Lat/Lon determined from GIS
Habitat: Park
Environment description: Growing on well-drained sand in a weedy area with a western exposure, by a public beach, on a berm separating the beach from a small drainage. Most plants are on the boundary between weeds and bare un-vegetated sand.
Number of plants sampled: 105
Associated species: Cocklebur (Xanthium) and Marestail (Conyza)
Aspect: West;
Soil Texture: Fine Sand
Collector(s):