Matthews, J.F. & Zane, S.F. 1992: Portulaca umbraticola Kunth (Portulacaceae) in the United States. – Castanea 57: 202-208

Title	Portulaca umbraticola Kunth (Portulacaceae) in the United States.
Authorship	Matthews, J.F. & Zane, S.F.
Date published	1992
Volume	57
In journal	Castanea
Pages	202-208