Abstract
Only 18.6% of 1,607 pollinations between diploid and tetraploid Hemerocallis formed capsules that survived beyond 35 days. Most seeds were aborted and nonviable. Twenty-nine triploid seedlings were obtained, 20 from tetraploid seed parents and nine from diploid seed parents. Most triploids were from crosses of Shirred Apricot and Imperial Blush with various seedlings of Tetra Chetco × Tetra Sherwood, indicating possible genetic influences on the survival of triploid zygotes. In normal seeds the endosperm and ovule grew rapidly during the early developmental stages, attaining near maximum sizes by the end of the third and fourth weeks, respectively. Embryos remained relatively small until the fourth week and attained mature size by the fifth week. Most triploid embryos aborted within the first 2 weeks.
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