If you're not familiar with it, I've provided the definition from wikipedia:
Quinoa (pronounced /?ki?no?.?/ or /kw??no?.?/, Spanish quinua, from Quechua kinwa), a species of goosefoot (Chenopodium), is a grain-like crop grown primarily for its edible seeds. It is a pseudocereal rather than a true cereal, or grain, as it is not a grass. As a chenopod, quinoa is closely related to species such as beets, spinach, and tumbleweeds. Its leaves are also eaten as a leaf vegetable, much like amaranth, but the commercial availability of quinoa greens is currently limited.
As you can see, its not classified by CW as a grain... but for the purposes of PB, does it count?