本研究以蠅子草與基隆蠅子草不同採集地各4批種原為材料，就溫度對生育期間長短的影響加以比較，以期瞭解兩變種間的歧異。溫室栽培的試驗顯示，在日均溫27.5℃下，分佈於本島山區的蠅子草達到始花期所需日數較短，約88天；分佈於北海岸的基隆蠅子草者較長，約126天。在32.5℃下，兩個變種更快開花，但皆無法結實。種子發育所需日數基隆蠅子草者略較蠅子草短，不過差異較小，平均約25天種子即可成熟。蠅子草能適應較低的溫度，在17.5℃下，約145天達開花，而且可以結果；而此溫度下基隆蠅子草經過300天仍然無法達開花期。兩個變種內，不同地區的種原間，開花所需日數也有顯著的差異，開花到種子成熟所需的日數在蠅子草的4個種原間也有差異，但在基隆蠅子草間則無。

Differences in growth duration among 8 accessions of silene fortunei as afected by temperature were compared in glass houses. Those of S. fortunei Vis. ,which wer collected from mountains of the main island of Taiwan, come to first flowering faster, 88 days in average under 27.5.C At the same temperature, those of S. fortunei var. kiruninsularis ( Masamune) Ying, which were collected from northern seacoast require 126 days. Both varieties reached first flowering quicker under 32.5.C,but set no seeds at all. S. fortunei adapted at lower temperature regime, under 17.5.C they reached first flowering 145 days after transplanting, while S. fortunei car. kiruninsularis did not reach flowering stage even after 300 days. Within each variety, days to first flowering were significantly different among 4 accessions. Days from flowering to seed ripening were significantly different among 4 accessions of S. fortunei, but not of S. fortunei var. kiruninsularis.