Arisaema triphyllum (L.) Schott

The New York Botanical Garden
Plants of U.S.A.
Araceae Arisaema triphyllum (L.) Schott
det. M. Nee, 2010
WISCONSIN, Richland Co., along Hwy. 56, 9.3 km (by air)
ESE of Viola, vicinity of parking area and area for piling
crushed limestone gravel, just downhill from the quarry.
T 12 N; R 2 W; SE%NEl/4 sect. 25.
43°29’19”N, 90°33’20”W. alt. 320 m.
N-facing pastured slope with young stand of trees, Ulmus
rubra, U americana, Acer negundo, Dicentra cucullaria,
Arisaema canadense, Arisaema triphyllum, Zanthoxylum
americanum, Viola sororia, V. pubescens.
Patches of erect stems in rich soft black soil in woods.
Inflorescences odorless (9:50 A.M., sunny); spathe green
outside, dark purple within on the flap; visible portion of
spadix yellow-green at one stage, purplish at another. Inside
of spathe tube yellow-green and purple.