Flora of the Southeastern United States
2022 Edition

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Key to Urticaceae

Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

1 Plant a tree; petiole attachment to leaf blade peltate; leaves alternate; [tribe Cecropieae]
1 Plant an herb; petiole attachment to leaf blade marginal; leaves alternate or opposite.
..2 Leaves opposite.
....3 Plant with stinging trichomes, these having a distinct bulbous or cylindrical base, and a stiff, translucent apex; [tribe Urticeae]
....3 Plant without stinging trichomes (or these minute and not apparent), the non-stinging hairs (if present) soft and flexible, lacking a bulbous or cylindrical base.
......4 Flowers in axillary spikes; foliage dull, yellow-green; leaves 3-veined from the base, the 2 main side veins reaching the margin about 2/3s of the way from blade base to blade tip, the midvein with 1-2 or more prominent secondary veins borne near or past the midpoint and at a sharply acute angle to the midvein, these arching to the leaf margin; [tribe Boehmerieae]
......4 Flowers in axillary panicles or fascicles; foliage shiny, bright green; leaves 3-veined from the base, the 2 main side veins extending to the apex of the blade, the midvein with many secondary veins borne along its length at a nearly right angle, and connecting to the 2 main side veins rather than reaching the leaf margin; [tribe Lecantheae]
..2 Leaves alternate (at least above, if not throughout).
........5 Leaves toothed; plant either with or without stinging trichomes.
..........6 Flowers in axillary spikes; woody herb to 4 m tall, without stinging trichomes; leaf undersurfaces white-pubescent; [tribe Boehmerieae]
..........6 Flowers in terminal or axillary panicles; herb to 1.5 m tall, with stinging trichomes; leaf undersurfaces green; [tribe Urticeae]
........5 Leaves entire; plants without stinging trichomes.
............7 Stipules absent; [tribe Parietarieae]
............7 Stipules present; [tribe Boehmerieae]

Key to Boehmeria

Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

1 Leaves opposite (upper leaves sometimes subopposite or alternate); leaf lower surface glabrous, puberulent, or short-pilose, the pubescence not obscuring the green leaf surface; inflorescences (axillary) spikes, often leafy at their apices; herb to 1.5 m tall; [subgenus Duretia]
1 Leaves alternate; leaf lower surface white-tomentose, the pubescence obscuring the green leaf surface; inflorescences (axillary) paniculately branched, never leafy at their apices; herb or shrub to 4 m tall; [subgenus Tilocnide]