For these cultivars identified as being triploids:
Chicago Apache, Spacecoast Gator Eye, Spacecoast Starburst, Crystal Pinot, Daring Deception, Strawberry Fields Forever, Moonlit Masquerade
The research reference is:
Ploidy Variation in Hemerocallis spp. and the Implications on Daylily Breeding
C. Zhang, D.M. Cao, X.C. Zhang, L.F. Kang, J.J. Duan, X.L. Ma, G.J. Yan and Y.S. Wang
in Proceedings of the International Conference on Germplasm of Ornamentals, Eds.: Qixiang Zhang and Guijun Yan
Acta Hort. 977, ISHS 2013 pp 197-204
The researchers counted the chromosomes in the cells.
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For Garnet Robe identified as being a triploid the reference is:
T. Arisumi, the Daylily Journal Vol 25 March 1971 pages 32-35 "Triploidy as a cause of low fertility in Garnet Robe.
Arisumi counted the chromosomes in the cells.
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Arisumi research "Experiments in breeding for triploid daylilies" the Daylily Journal Vol 24 1970 pg 33-37
and "Embryo development and seed set in crosses for triploid daylilies" Botanical Gazette 1973 Vol 134 pg 135-139
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For the research that produced VT Spirit:
"Development of triploid daylily (Hemerocallis) germplasm by embryo rescue"
Euphytica October 2009, Volume 169, Issue 3, pp 313-318
Zhiwu Li, Linda Pinkham, N. Faith Campbell, Ana Carolina Espinosa, Rumen Conev
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For Celtic Sunrise and Forbidden City identified as being triploids the research reference is:
Ploidy estimation in Hemerocallis species and cultivars by flow cytometry
Hiroyuki Saito, Keiko Mizunashi, Shigefumi Tanaka, Yukiko Adachi, Masaru Nakano
Scientia Horticulturae 97 (2003) 185–192
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I cannot help identify the basis for the triploid ploidy in the ATP database.
