Thanks Becca!
Steve - nigro-hirsutes/formosae dendrobiums all have little black hairs on the canes (nigro-hirsute = black-hair) with the exception of dendrobium senile, which has white hairs!
They're usually white, yellow or green, with distinctively striking orange or red splashes in the throats. They come in many shapes and sizes, but the great thing is that a majority of them are quite small and compact. I don't know why, but I find this section of dendrobiums really cool and interesting. Maybe it's the red and white combo...I am canadian after all
My favorite species in the group is probably either draconis, or tobaense.
H&R carries many formosae hybrids so you might want to check em out! I got my Dend Lori's Star as well as Frosty Dawn from them.
In terms of fragrance, only a few are fragrant. Draconis and christyanum are the ones I can think of off the top of my head. I have Peng Seng (tobaense x cruentum) which smells slightly bad (although it's quite faint).