Parastichy, in phyllotaxy, is the (invisible) spiral line of the pattern of the areoles on some plants, such as cactuses and pinecones. These spirals involve the insertion of a single primordium. They have been described as an effect of the human eye and the way it connects "nearest points" on certain spiral patterns.
- Smith College, Spiral Lattices & Parastichy
|This botany article is a stub. You can help Wikipedia by expanding it.|