The Manual of the Botany of the Northern United States / Including the District East of the Mississippi and North of North Carolina and Tennessee

by Asa Gray

21. Lophanthus. Stamens divergent, exserted; upper pair declined, lower ascending.

22. Cedronella. Stamens all ascending, not exceeding the lip of the corolla.

[*][*] Anthers more or less approximate in pairs; their cells divaricate or divergent; filaments ascending, not exserted.

23. Nepeta. Calyx more or less curved, equally 5-toothed.

24. Dracocephalum. Calyx straight, the upper tooth much the larger.

Tribe V. SCUTELLARINEÆ. Stamens 4, ascending and parallel. Calyx bilabiate, closed in fruit; the rounded lips entire. Corolla bilabiate, the upper lip arched.

25. Scutellaria. Calyx with a helmet-like projection on the upper side.

Tribe VI. STACHYDEÆ. Stamens 4, parallel and ascending under the galeate or concave upper lip, the lower (outer) pair longer (except in n. 31, 32). Calyx 5–10-nerved, not 2-lipped (except in n. 26).

[*] Calyx reticulate-veiny, deeply bilabiate, closed in fruit.

26. Brunella. Calyx nerved and veiny; upper lip flat, 3-toothed, the lower 2-cleft.