Cal 10-nerved, campanulate, regular or (ours) 2-lipped and becoming inverted, the morphological upper lip with 3 partly connate teeth, the lower evidently shorter, with 2 distinct teeth; cor irregular, the lowest lobe the largest, declined, the other 4 subequal and more than half as long as the lowest one, the sinus between the 2 upper lobes scarcely more prominent than the lateral sinuses; stamens 4, exserted, the filaments often (as in our spp.) arcuate; pollen-sacs divaricate, often confluent in dehiscence; ovary rather deeply 4-lobed, the sculptured nutlets laterally attached, united above 1/3 their length; herbs or near-shrubs with mostly entire lvs; fls borne in cymose axillary clusters. 16, N. Amer.
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