Accepted By:
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FNA GRAY-CARDS.
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Hartman, R. L. & B. E. Nelson. 1998. Novelties from North America north of Mexico: A 20-Year Vascular plant Diversity Baseline. 1–51 (mss.).
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Hartman, R. L. & M. A. Lane. 1987. A new species of Machaeranthera section Psilactis (Asteraceae: Astereae) from coastal Texas. Brittonia 39(2): 253–257.
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