Rydberg, Per Axel (1896). "The North American Species of Physalis and related Genera". Memoirs of the Torrey Botanical Club. 4 (5): 297–374. ISSN0097-3807. JSTOR43391911.
Rydberg, Per Axel (1896). "The North American Species of Physalis and related Genera". Memoirs of the Torrey Botanical Club. 4 (5): 297–374. ISSN0097-3807. JSTOR43391911.