Which is known as the most venomous spiders in north america?

Recluse Spiders (Loxosceles)  is known as the most venomous spiders in north america.

Explanation:

There are 3,000 species of spiders  described in North America.

Among the spiders found in North America, only the Loxosceles and Latrodectus species are considered really dangerous and an average of 4 people die from venomous spider bites a year in the USA.

The Brown Recluse Spider's venom can cause significant cutaneous injury with tissue loss and necrosis, and can be deadly to humans. However, though it is very dangerous to people, it is not an aggressive species and it only bites when threatened.

The most venomous spider in noth America is the brown recluse