life
cycle - perennial, reproducing by seed
stems -
upright, very tall, hollow, pubescent or hairy, unbranched
growth
habit
leaves -
large, compound, 3 segments; segments deeply lobed, coarsely
toothed; petiole base winged and clasping leaves
1, leaves 2
flowers -
white; umbel, flat-topped cluster flower clusters
seedpods - ovate, flat, 1-seeded, winged, ribbed