Sampson's Snakeroot, False Scurf-pea - Orbexilum pedunculatum
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Orbexilum pedunculatum - Sampson's Snakeroot, False Scurf-pea. This plant can be easily identified as a member of the pea family (Fabaceae) based on the flowers and leaves, but the seedpod is circular rather than the long peapod fruit we normally expect from Fabaceae. It is a plant primarily of the southeastern United States, although its range extends northward into Illinois, Indiana, Ohio, and southern Michigan.
Found in:
AL, AR, FL, GA, IL, IN, KS, KY, LA, MD, MI, MO, MS, NC, OH, OK, SC, TN, TX, VA
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Distribution of Orbexilum pedunculatum in the United States and Canada:
Map courtesy of The Biota of North America Program.
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| | Site: Ascalon Road, Walker County, GA Date: 2013-June-07 | Photographer: Gerald C. Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro | | The shapes of the inflorescence and individual purplish pink flowers allow the plant to be easily identified as belonging to Fabaceae. | | 
| | Site: Ascalon Road, Walker County, GA Date: 2013-June-07 | Photographer: Gerald C Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro | | The inflorescence of Orbexilum pedunculatum is on a long peduncle (thus the species epithet) up to 6 inches long, holding the inflorescence well above the leaves. The similar species Orbexilum onobrychis has a shorter peduncle, carrying the inflorescence barely above the leaves. | | Click on the photo for a larger image
| | Site: Ascalon Road, Walker County, GA Date: 2013-June-07 | Photographer: Gerald C Williamson
Nikon D7000 | | The leaves of Sampson's Snakeroot are alternate. They are pinnately trifoliate, with longer and narrower leaflets than those of similar Sainfoin (Orbexilum onobrychis). The leaflets of O. onobrychis are also acuminate, while those of O. pedunculatum have blunt tips. The lateral leaflets are nearly sessile, while the terminal leaflet is on a long petiolule (petiole, but for a leaflet rather than leaf.) | | Click on the photo for a larger image
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References used for identification and information:
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