Differences Between Asclepias Incarnata and Asclepias Perennis

Leaf Blade Base: Short-Tapering vs. Long Tapering

One of the primary distinctions between A. incarnata and A. perennis lies in the tapering of the leaf blade to the petiole.

A. incarnata: The leaf blade base is described as “rounded to short-tapering.” This means the transition from the leaf blade to the petiole (the stalk that attaches the leaf to the stem) is relatively brief. The leaf appears to taper quickly, resulting in a more immediate connection to the petiole.

A. perennis: In contrast, the leaf blade base of A. perennis is “long tapering.” This indicates a more gradual transition from the leaf blade to the petiole, creating a longer, more extended taper.

Although these descriptions are helpful, they lack quantifiable measurements, which can make on-the-ground identification challenging for those not familiar with these nuances. Observing the overall shape and tapering length in the context of the entire plant can often aid in accurate identification.