Vascular Plants of North Carolina
Account for Water Dawnflower - Stylisma aquatica   (Walter) Rafinesque
Members of Convolvulaceae:
Members of Stylisma with account distribution info or public map:
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Section 6 » Order Solanales » Family Convolvulaceae
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Author(Walter) Rafinesque
DistributionLimited to the southwestern part of the Coastal Plain, mostly not in the Sandhills region; ranges southeast to Brunswick County.
AbundanceRare. The NCNHP has only 11 records, of which only 8 seem to be extant, and only 5 seem to be in good condition. This is a State Endangered species, but the State Rank leans more to S1 than to their S2. The website editors suggest S1S2 for the rank.
HabitatThis is the only wetland Stylisma in NC, and it has very exacting habitat requirements, making it rare. It occurs in Clay-based bays, shallow pineland pools, and other "ponded" places in sandy soil. Rarely does it occur in wet places in pine savannas.
PhenologyBlooms in June and July, and fruits shortly after flowering.
IdentificationThis is the "odd" Stylisma, being an herbaceous vine growing to 2-3 feet long, with scattered, alternate, pubescent leaves. Each leaf is lanceolate to oblong-lanceolate, with rounded ends, and about 1-1.5 inches long and 1/3 as wide. At leaf axils is a very long flower stalk, often 2 inches long, with 1-3 small, pink to light purple flowers, each about 1/2 to 2/3-inch long. This flower color separates the species from the other four in the state, as those have white flowers, and the very long pedicels and wetland/pool habitat also makes this rare species quite distinctive. To see this species in NC, you will need to know where it occurs, as you almost certainly are not going to stumble onto it otherwise.
Taxonomic CommentsFormerly named as Bonamia aquatica.

Other Common Name(s)None
State RankS2 [S1S2]
Global RankG4
State StatusE
US Status
USACE-agcpFACW link
USACE-empFACW link
County Map - click on a county to view source of record.
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B.A. SorrieScotland County, 2020, State Line Prairie Bay, in narrow powerline. ScotlandPhoto_natural
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