Subantarctia florae is a species of Orsolobidae. The species is endemic to New Zealand.
This species was described in 1956 by Ray Forster from male and female specimens collected in Nelson. The holotype is stored in Te Papa Museum under registration number AS.000030.
The male is recorded at 3.15mm in length whereas the female is 5.44mm. This species has reddish brown legs and carapace. The abdomen is uniform creamy white.
This species is known from throughout Nelson, New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Naturally Uncommon" with the qualifier "Range Restricted".