The following Participating Institutions are custodians for this species in the CPC National Collection:
The Holden Arboretum
The conservation of Napaea dioica is fully sponsored.
Lindsey Parsons contributed to this Plant Profile.
This mallow species produces attractive white flowers in June and July (NatureServe Explorer 2002) and is cultivated for ornamental purposes by a number of nurseries. After the last glaciation, N. dioica expanded its range via riparian corridors (Botany2001 website 2002). Its range has become extremely limited as its habitat is ideal for farming and so has been plowed throughout most of its historic range (NatureServe Explorer 2002). As populations have become more fragmented and isolated from each other, riparian corridors have again become increasingly important in maintaining gene flow in this population (Botany2001 website 2002).
Distribution & Occurrence
It is often found in alluvial meadows along streams and rivers or in areas of moist, rank, weedy vegetation, sometimes including shrubs (WIS 2002, NatureServe Explorer 2002).
In Illinois Actinomeris alternifolia, Amorpha fruticosa, Campanula americana, Celtis occidentalis, Elymus virginicus, Eupatorium rugosum, Rudbeckia laciniata, Silphium perfoliatum are considered associate species (Swink and Wilhelm 1979). In Wisconsin associates include Silphium perfoliatum, Thalictrum dasycarpum, Aster spp., Solidago spp., and Helianthus spp (NatureServe Explorer 2002).
Conservation, Ecology & Research
The potential for asexual reproduction
The existence of seed banks for this species
The cause of the edge affect on seed set in habitat fragments (reduced set at edges)
Light requirements for sexual reproduction
Optimal habitat conditions
Maintenance of free-flowing streams which are thought to provide good conditions for seedling establishment
Protection of riparian corridors
Wenger, J.P.; La Duke, J.C. Genetic structure and isolation-by-distance suggest a role for riparian corridors in the post-glacial natural history of Napaea dioica L. (Malvaceae). Botany 2001 "Plants and People"; August 12 - 16, 2001; Albuquerque Conventio