Endangered Species
Midwest Region



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Missouri bladderpod (Physaria filiformis)

The Missouri bladderpod is a small annual plant, about 4 to 8 inches tall, with distinctive canary-yellow flowers cluster at the top of the stems and bloom from April to May. It grows strictly in southern Missouri and northern Arkansas. It probably never grew beyond this range but was known from only nine sites in three counties when it was first listed as endangered in 1987. After more surveys and actions undertaken to conserve the bladderpod, the number of documented populations increased to 61 sites in 4 counties in Missouri and 2 sites in 2 counties in Arkansas.


Missouri bladderpods grow mostly in open limestone glades; but it has been found on one dolomite glade in Arkansas. Glades are naturally dry, treeless areas with shallow, loose soil and areas of exposed rock. Glades are described by the underlying rock (e.g., limestone or dolomite). Sometimes the bladderpod is found on highway rights-of-way and pastures where mowing and grazing have kept the area open. Occasionally it is found in open rocky woods.


Missouri bladderpod

Photo by Missouri Department of Conservation; Jim Rathert


Status: Threatened

Reclassified to threatened Oct. 15, 2003

Listed as Endangered on January 8, 1987


Habitat: Open glades in shallow limestone soils


Lead Region: 3


Region 3 Lead Office: ColumbiaES, Missouri Field Office


Range: Missouri


Natural History, Ecology, and Regulatory Information

Federal Register Final Rule: Technical Corrections for Three Midwest Region Plant Species (Sept. 14, 2010) - - includes Missouri bladderpod


Fact sheet

Species Profile - links to the National USFWS website


We're Glad to Have Glades (pdf) article in the Endangered Species Technical Bulletin



5-Year Review (2015)Adobe PDF Icon


5-Year Review (2008)Adobe PDF Icon


Recovery on the Horizon


Reclassifiction from Endangered to Threatened

News Release (October 15, 2003) - Rare Plant Rebounds; U.S. Fish & Wildlife Service Downlists Status of Missouri Bladderpod from Endangered to Threatened html - pdf


Federal Register Notice Reclassification of Missouri Bladderpod From Endangered to Threatened Adobe PDF Icon


Fact Sheet - Questions and Answers About the Reclassification of the Missouri Bladderpod from Endangered to Threatened html - pdf



Midwest Endangered Species


Last updated: March 12, 2018