Arisaema utile (Araceae)
Plants dioecious. Tuber depressed globose, 3–10cm in diam., with small tubercles. Cataphylls to 9cm, membranous. Leaf solitary; petiole green with dark purple spots, 20–40cm, proximal 1/3 sheathing into pseudostem; leaf blade 3-foliolate; leaflets sessile or subsessile, green with reddish margin; veins raised, often reddish abaxially; central leaflet broadly rhombic or ovate-rhombic, sometimes broader than long, 7–15 × 6–11cm, base broadly cuneate, apex acuminate; lateral leaflets obliquely ovate, 11–14 × 7–9cm, base rounded to subtruncate, apex acuminate. Peduncle shorter than petioles, 20–22cm. Spathe tube purplish brown with longitudinal whitish lines, cylindric, 4–5 × 1.5–2cm, longitudinally lamellate inside, throat margins slightly recurved; limb strongly incurved, dark purple with white longitudinal and reticulate lines (at margin), obovate, 7–8 × 3–5cm, apex acuminate. Spadix unisexual; female zone conic, 2.6–6cm; ovary green, obovoid; stigma subsessile, dark purple; male zone 1.5–2cm × ca. 4mm; synandria of 2–5 stamens; connected filaments distinct, 0.5–1mm; anther dehiscing by horseshoe-shaped slit. Appendix brown, flagelliform, 11–20cm, thickened toward base 5–15 mm wide, base truncate and stipitate.
This material was reprinted with permission from the Missouri Botanical Garden Press, St. Louis, and Science Press, Beijing.
This material was reprinted with permission from the Missouri Botanical Garden Press, St. Louis, and Science Press, Beijing.
Tsuga forest margins, thickets.