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A seedling I had and unfortunately lost in a very bad winter, but it must be one of the most attractive of the viridiflorus forms. You can see the juvenile hair the seedling initially has at the base of the plant. The seed originally came from Kohres:-

Echinocereus viridiflorus v. canus.
It was described in 2006 by Powell and Weedin:-

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That is a super spiny one! Sure is a lot of variety in that species.

Yes, out of flower you would not think they are all viridiflorus. Here's some other varieties or subspecies:-

This seed came as Echinocereus viridiflorus subs. standleyi but it looks more like an Echinocereus chloranthus ssp. cylindricus from the flower since standleyi is sometimes considered a synonym of E, viridiflorus ssp. correllii which has a green flower.
Echinocereus viridiflorus SB167
They usually flower in a few years from seed too.

Var canus is a real looker even without flowers.

Am doing a batch of seedlings of canus -- outstanding germination & very attractive, even as a youngster (3 mos.)!