Yes - just like Basswood is a Hardwood , Yellow-poplar is hardwood.
Douglas-fir, Hemlock and "Redwood" is softwood.
(cited from Wood Handbook - US Department of Agriculture/Forest
Service/Forest Products Laboratory / FPL-GTR-190.

Classification by seed description is a bit non-technical - e.g.
A steel ball dropped from a certain distance and the dimple is measured.

The gymnosperms are a group of seed-producing plants that includes
conifers, cycads, Ginkgo, and Gnetales. The term "gymnosperm" comes from
the Greek composite word γυμνόσπερμος, meaning "naked seeds"

Seeds are not really naked, each are covered in a packaging that helps
distribute it near by via air currents. They also help the seed to float.

Etymologically, angiosperm means a plant that produces seeds within an
enclosure, in other words, a fruiting plant. Flowering fruiting plants.

While it might be just fine for Botany, woodworking it carries a
different classification.

Martin

On 5/16/2015 10:58 AM, John McCoy wrote:
Martin Eastburn wrote in news:zbz5x.4621
:

Redwoods are officially a Hardwood.

Umm, no. Redwoods are gymnosperms, not angiosperms, and thus
they are offically a softwood.

John