Yes, Unifolate - one leaf... plant produces a sheath/spike and buds from the base of the leaf. Bifolate - two leaves... plant may produce buds directly from the juncture of the leaves or send a sheath and buds up from the juncture.
One of my favorite old time catts is doing that right now... I will post a photo this weekend. This plant has bloomed regularly as a unifolate, but the growth that started last fall developed a second leaf instead of a sheath. I was really bummed, but then a few months later, I looked at the juncture of the leaves and saw 2 tiny buds! (Never put out any kind of sheath) The first bloom is almost fully open. The flowers are not as large, and not quite the same shape as the ones produced from a unifolate p-bulb and sheath.
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