Eight taxa of Salvia L., representing broad geographic origin and diversity within the genus, were grown under long day conditions for 36 d at 15-h days of 20, 25, 30, 35, or 40 °C and 9-h nights of 15 or 25 °C. Taxa of European origin displayed broader tolerance to high day temperatures (DTs) with the lowest relative reduction in growth and net photosynthesis (Pn) occurring at DTs 30 °C or greater compared with those native to North and South America. Salvia splendens Sell. ex Roem. & Schult. (scarlet sage) was particularly intolerant of high temperatures with all plants dying at days of 40 °C. All plants of S. nemorosa L.‘Ostfriesland’ (‘Ostfriesland’ wood sage), S. pratensis L. (meadow sage), and S. × sylvestris L. ‘Mainacht’ (‘May Night’ salvia) survived at days of 40 °C with no visual signs of injury, whereas all other taxa except S. splendens exhibited stunted, contorted growth with foliar chlorosis and necrosis at 40 °C. Day temperature exerted the primary effect on top growth, root growth, and Pn of all taxa. Night temperature effects were significant for some taxa but were of less importance than day temperature.
Currently, information regarding asexual propagation of Styrax L (snowbells) is lacking in the literature. In this study, the influence of K-IBA treatment on root production was investigated on stem cuttings of 15 different taxa of Styrax. Softwood or semi-hardwood stem cuttings dipped in 0, 3000, or 8000 ppm (0, 0.3, or 0.8%) K-IBA were evaluated for percent rooting and root number per rooted cutting. Cuttings were allowed to root under intermittent mist in a perlite:peat (3:1 by vol) rooting substrate for 9 weeks. Percent rooting and the response to K-IBA varied by species and by cultivar within a species. All 15 taxa rooted to some extent. Auxin application improved percent rooting for S. dasyanthus, S. japonicus ‘Carillon’, S. japonicus ‘Pink Chimes’, S. japonicus ‘Snowfall’, and S. tonkinensis, and decreased percent rooting for S. formosanus, S. japonicus ‘Issai’, S. japonicus ‘Pink Cascade’, and S. serrulatus (clone B). Application of K-IBA increased the number of roots produced per rooted cutting on S. calvescens, S. confusus, S. japonicus ‘Pink Chimes’, S. serrulatus (clone A), and S. tonkinensis.
A morphological comparison of Calycanthus L., Chimonanthus Lindl., and Sinocalycanthus W.C. Cheng and S.Y. Chang is presented. Intergeneric crosses between Sinocalycanthus chinensis (W.C. Cheng and S.Y. Chang) W.C. Cheng and S.Y. Chang and Calycanthus floridus L. produced hybrid progeny. Data are presented comparing the parents and the progeny. ×Sinocalycalycanthus raulstonii Lasseigne and Fantz is proposed as the name for these hybrids and is validated with a Latin diagnosis. The original cultivar is named `Hartlage Wine'.
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