References
Woodson, R.E., Jr. 1929. Studies in the Apocynaceae. IIIA. A new species of Amsonia from the south-central states. Ann. Missouri Bot. Garden 16: 407-410. Google Scholar
Woodson, R.E., Jr. 1929. Studies in the Apocynaceae. IIIA. A new species of Amsonia from the south-central states. Ann. Missouri Bot. Garden 16: 407-410. Google Scholar