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  • Author or Editor: M. J. Kaspar x
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Seeds of Coreopsis tinctoria Nutt., Ipomopsis rubra (L.) Wherry, Linum perenne L., and Asclepias tuberosa L. were germinated under constant light at 155 ± 10 μEm−2sec−1 on a thermogradient plate to determine optimum temperatures for germination. Optimum temperatures were 30°C for C. tinctoria, 25° for L. perenne and 30° for A. tuberosa. I. rubra exhibited poor germination at all temperatures in light. C. tinctoria, L. perenne and A. tuberosa germinated within temperature ranges of 15° to 35°, 15° to 25°, and 25° to 35°, respectively. A. tuberosa was the slowest germinating of the 3 species.

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