The vernal equinox.
The scientific name for the first day of spring is the vernal equinox. It occurs around March 21st and marks the official start of spring in the northern hemisphere when daylight and nighttime hours are approximately equal.
The scientific name for a spring azure butterfly is Celastrina ladon.
The scientific or taxonomic name would be Rosa 'Love's Spring'.
Solancenee
vernal equinox
The accepted scientific name is Celastrina ladon.
The accepted scientific name is Lomographa glomeraria.
The accepted scientific name is Lomographa vestaliata.
The scientific or taxonomic name would be Pseudacris crucifer.
The scientific or taxonomic name would be Gyrinophilus porphyriticus.
The scientific or taxonomic name would be Agaricusbitorquis rodmanii.
The scientific or taxonomic name would be Clarkia hybrids.