KEY. 195 



495. Tube of the white or cream-colored corolla curved 

 upward. Calyx 2-lipped ; upper lip 3-toothed ; tube curved. 

 Leaves broadly ovate, coarsely crenate, exhaling, when 

 bruised, the odor of lemons. Clusters few-flowered, loose, 

 secund, with a few leaf-like, ovate bracts. 



Melissa oflEicinalis, L. 



Tube of the corolla straight, or nearly so ; throat 



inflated 496 



496. Calyx gibbous below: The sessile globular clus- 

 ters of pale purple flowers crowded with awl-shaped bracts, 

 Avhich are as long as the calyx. Bracts and calyx hispid 

 with whitish hairs. Leaves ovate, petioled, somewhat cre- 

 mate. Clinopodimn, L. 



( CalamintJia Clinopodimn^ Benth). 



Calyx scarcely gibbous. Bracts less conspicuous. 



Flowers purplish or whitish. Leaves various ; broadly 



ovate, oblong, oblong-linear, or linear, crenate, sparingly 



cut-toothed, or entire, petioled. Calamintha. 



497. Calyx strongly 2-lipped ; upper lip truncate, closed 

 in fruit 498 



Calyx not (or scarcely) 2-lipped 499 



498. Calyx-lips toothed; upper 3 teeth minute, lower 2 

 large. Stems simple, or somewhat branched, ascending. 

 Leaves oblong-ovate, dentate, petioled. Flowers blue, in 

 clusters of 3, forming closely spiked verticils. Bracts im- 

 bricated, reniform, 2 under each verticil. 



Brunella vulgaris, L. 

 Calyx-lips entire, the upper with a helmet-like ap- 

 pendage on the back. Scutellaria. 



499. Calyx 4-cleft. Corolla \\ inch long, yellowish- 

 white. The upper pair of anthers connate ; each anther 

 with one cell fertile, and the other smaller one sterile. 

 Filaments hairy. Herbs, 1 foot high. Leaves broadly 

 ovate, cordate, crenate, lower ones long-petioled, upper ses- 

 sile and passing into bracts, each with a solitary flower. 



Synandra grandiflora, Nutt. 

 Calyx 5- or 10-toothed 500 



500. Calyx almost equally 5-toothed 501 



Calyx unequally 10-toothed, woolly, the teeth re- 



