Trees , to 15(-25) m, rather massive; trunks sometimes straight and erect, more commonly irregular, reclining, or prostrate with branches irregular and sometimes near ground, to 2+m diam. Leaves: stipules entire to somewhat dentate. Leaf blade dark green, 3-5-lobed, 10-25 × 10-25 cm, rather thick; lobes of blade mostly longer than wide, basal lobes usually somewhat smaller and spreading, not reflexed, sinuses broad and deeply concave, depth of distal sinuses about 1/3-2/3 distance from sinus to base of blade, terminal leaf lobe ca. 1/3-2/3 length of blade; margins entire to remotely serrulate, apex acute to acuminate, sometimes rounded; surfaces abaxially persistently tomentose, adaxially glabrescent. Pistillate inflorescences: heads (1-)2-7; fruiting heads 20-25(-30) mm diam., lateral ones sessile; fruiting rachis to 25 cm. Achenes 7-10 mm, basal hairs about 2/3 length of achenes. 2 n = 42.
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