194 PRACTICAL BOTANY. 



Leaves lanceolate, entire, sessile. Flowers blue, in racemose, 



secund verticils. Hyssopus officinalis, L. 



Calyx 10- to 13-nervecI 490 



490. Calyx-throat hairy 491 



Calyx-throat naked 492 



4:91. Calyx erect in fruit, 5-toothed. Bracts large, round- 

 ish, tinged with purple. Stamens exserted. Leaves round- 

 ovate, petioled. Flowers purplish, in dense, oblong, or cy- 

 lindrical spikes. Origanum vnlgare, L. 

 Calyx nodding in fruit, 2-lipped; upper lip 3-tooth- 

 ed, spreading, lower bilid,with the subulate segments ciliate. 

 Bracts narrow, minute. Herbs prostrate. Leaves oval or 

 ovate, short-petioled. Flowers purplish, or whitish, capitate, 

 or verticillate. Thymus Serpyllum, L. 



499. Anther-cells fixed by a triangular connective. Ca- 

 lyx 10-nerved. Stamens connivent, arching, scarcely exsert- 

 ed. Herbs much branched. Leaves lance-linear, acute. Co- 

 rolla lilac, or white, the throat dotted with purple. Floweis 

 about 5 together, in axillary cymes. Satureja hortensis, L. 



Anther-cells parallel. Stamens exserted, or includ- 

 ed ; upper pair scarcely shorter than the lower. Calyx about 

 13-nerved. Corolla whitish or purplish, the lips dotted witli 

 purple. Floral leaves often whitened. Verticils dense, with 

 crowded bracts, usually forming terminal heads or close 

 cymes. Pycnanthemum. 



493. Stamens exserted through a cleft in the upper side 

 of the tube of the corolla. Upper corolla-lip consisting of 

 4, small, nearly equal lobes, which are turned forward ; 

 lower lip truncate, larger and roundish. Leaves short- 

 petioled, ovate-lanceolate, serrate. Flowers pale purple, in 



, a long wand-like spike. Teucrium Canadense, L. 



Stamens ascending in pairs beneath the upper lip. 



494 



494. Calyx 13-nerved, 5-toothed, and somewhat 2-Hp- 

 ped 495 



Calyx 5- to 10-nerved, or irregularly netted, some- 

 times 2-lipped 497 



