Paul, I see that there are some "up close and personal" photos of the two tripartita forms on my old Pinellia Page: <http://aroid.org/genera/arisaema/…> I'll let others pass judgement as to the differences, or lack thereof. From my perspective, I see more of a difference in the spadix than in the spathe, ignoring the colors. I think the inflorescence of Atropurpurea was a bit older than the regular form in these photos, and the spadix had withered and yellowed to some degree. I see these shots are almost 10 years old, and apologize for the lack of resolution. Digital cameras have come a long way since then, eh? --Roy High temp today of 37F... ----- Original Message ---- From: Paul T. <firstname.lastname@example.org>. Out of interest, while we're discussing Pinellia...... IS P. tripartita 'Atropurpurea' actually P. tripartita? While the leaves are the same shape, the growth habit, height of flowers, flower form etc (the stright species for example has a flare around the edge of the spathe, while the 'Atropurpurea' flower is far more open and without any sign of the flare along the edge) are just so different to the straight species that I have always wondered whether it actually is purely that species?