*The following is based on Gann, G.D., K.A. Bradley & S.W. Woodmansee. 2002. Rare Plants of South Florida: Their History, Conservation, and Restoration. The Institute for Regional Conservation: Miami. For updated species accounts, see Citation below. For the original text, follow the link in the Update field. If no Update field is displayed, then cite as the original publication.

Evolvulus grisebachii Peter

Grisebach''s Dwarf morningglory

South Florida Status: Critically imperiled. One occurrence at National Key Deer Refuge and adjacent private properties.

Taxonomy: Dicotyledon; Convolvulaceae.

Habit: Perennial terrestrial herb.

Distribution: Native to South Florida and Cuba.

South Florida Distribution: Monroe County Keys.

South Florida Habitats: Pine rocklands.

Protection Status: Listed as endangered by FDACS and as critically imperiled by FNAI.

Aids to Identification: Chafin (2000) has illustrations and a color photo.

References: Small, 1933a; Ooststroom, 1934; Ward, 1968b; Long & Lakela, 1976; Wunderlin, 1998; Chafin, 2000; Coile, 2000.

Synonyms: Evolvulus wrightii House.

Historical Context: John Loomis Blodgett first collected Grisebach’s dwarf morningglory between 1838 and 1853 on Big Pine Key in Monroe County (s.n., NY). It has never been vouchered for any other islands in South Florida. Numerous collections have been made on Big Pine (e.g., Small 3809, NY; Killip 31449, US; Avery et al. 1745, USF; Brumbach 9669, FSU), but few give good data on where plants were found. Grisebach’s dwarf morningglory seems to be restricted to the vicinity of Key Deer Boulevard and Watson Boulevard, near the Blue Hole, including private property and property owned by the National Key Deer Refuge. The authors have observed plants there as recently as 2001.

Major Threats: Fire suppression; exotic pest plant invasions; habitat destruction; sea-level rise.

Comments: Ward (1968b) reported this species from Puerto Rico, apparently in error. The status of this species in Cuba is unknown.

Recommendations: • Map and monitor known stations on a regular basis. • Acquire private properties with Grisebach’s dwarf morningglory and incorporate into National Key Deer Refuge. • Conduct conservation biology and conservation horticulture studies. • Determine status in Cuba.

Update: Recent population estimates by Keith A. Bradley indicate that there are more than 10,000 individuals in the Florida Keys, thus changing its status to imperiled in South Florida.

Citation: Gann, G.D. 2006-2012. Species Account Update, Floristic Inventory of South Florida Database Online. The Institute for Regional Conservation. Delray Beach, Florida.