1	Stems elongate-rhizomatous, horizontal, low-growing; leaves simple, blades ovate to oblong, 1.5–5 (−10) × 1.5 −3.5 (−8) cm, apices rounded, base cordate to truncate, margins denticulate; umbels simple, 1−4 (−9) flowers per umbel, pedicels 0.5−3 mm long; fruit strongly flattened laterally, prominently nerved with raised reticulate venation between nerves, corky ribs lacking	Centella asiatica Fig. 107
–	Stems erect, not horizontal or low-growing; leaves 1–3 times pinnately compound, blades to 30 × 25 cm, leaflets lanceolate to lance-oblong, 4−7 (−14) cm ×0.6−3 (−5) cm, apices acute, bases cuneate to rounded, frequently asymmetrically so, margins serrate; umbels compound, > 9 flowers per umbel, pedicels 2−10 mm long; fruit somewhat flattened laterally with strong, flattish corky ribs	Cicuta maculata Fig. 108

Key adapted from Radford et al. (1968), Godfrey and Wooten (1981), and Weakley (2012).