132 LAT5IATAE. 



Tribe Monardeae. Corolla strongly 2-lipped; fertile stamens 2, straight 

 or ascending-; anther-eells linear-oblong, solitary or separated by a long con- 

 nective. 



Salvia. Calyx 2-lipped; stamens inserted on the throat of the corolla; connective 



linear or filiform, transverse". 

 Monarda. Calyx nearly equally 5-toothed, 15-nerved ; anther cells confluent into one. 

 Blephilia. Calyx 2-lipped, 13-nerved; anther-cells confluent. 

 Tribe Nepeteae. Calyx about 15-nerved; stamens 4, all fertile; the upper 

 pair the longer; corolla 2-lipped. 



Lophanthos. Stamens exserted; anther-cells parallel. 

 Nbpbta. Stamens not exserted ; anther-cells divergent. 

 Dracocephalum. Stamens exserted ; anther-cells divergent. 

 Tribe Scutellarineae. Calyx 2-lipped, closed in fruit, lips entire; corolla 

 2-lipped; stamens 4, all fertile, ascending, parallel, upper pair shorter. 

 Scutellaria. Upper lip of the calyx with a helmet-like appendage. 

 Tribe Stachydeae. Calyx 5-10-nerved, 2-lipped only in Prunella; stamens 

 4, fertile, parallel, ascending under the upper lip of the corolla; upper pair 

 shorter. 



* Calyx 2-lipped, not membranous, closed in fruit. 

 Prunella. Calyx deeply 2-lipped, reticulate veiny. 



* * Calyx 5-toothed, membranous, open in fruit. 

 Physostegia. Calyx 5-toothed, inflated in fruit. 



* * * Calyx 5-10-toothed, not membranous, 5-10-nerved. 

 f Naturalized Old World species, ijrowlny in waste places. 

 Marrubium. Stamens and style included in the tube of'the corolla. 



Leonurus. Leaves cleft or incised; calyx-teeth spiny-pointed and spreading- when old. 

 Lamium. Leaves mostly cordate; calyx-teeth lanceolate, subulate -pointed. 

 Galeopsis. Stem swollen below the joints; calyx-teeth spinescent; anthers trans- 

 versely 2-valved. 



f f Native species, growing in damp soil. 

 Stachys. Stamens or only the lower pair often deflexdd'to the side of the throat of the 

 corolla; nutlets obtuse. 

 ISANTriUS Mx. Annual, branched, with 3-nerved leaves, and 1-3-flow- 

 ered axillary peduncles. Calyx campanulate, equally 5-toothed. Corolla 

 equally 5-parted, segments ovate. Stamens 4, but slightly didynamous, in- 

 curved, ascending. Ovary deeply 4-lobed. 



I. caeruleus Mx. False Pennyroyal. Stem 8-18 inches high, pubescent; 

 leaves lance-oblong, nearly entire; flowers small, pale blue; corolla but little 

 longer than the calyx. Dry soil; July-August; frequent; Winneshiek, Scott, 

 Muscatine, Henry, Johnson, and Lyon counties; reported from Fayette 

 county. (I. hrachiatus (L.) B. S. P.) 



Trichostema dichotomum L. Annual, stem 6-20 inches high, viscid- 

 pubescent; leaves oblong or oblong-lanceolate, thin; flowers paniculate: ca- 

 lyx oblique, unequally 5-lobed; corolla blue, pink or white, nearly reo-ular- 

 stamens long-exserted. Reported by Arthur, but the species seems not to 

 have been found by any other collector. As Iowa is out of the rano-e of the 

 species its occurrence may be considered doubtful. 



TEUCRIUM L. Perennials. Calyx nearly regular, 5-toothed. Corolla 

 5-lobed; lower lobe the largest, the upper four nearly equal. Stamens 4, ex- 

 serted from the deep cleft between the 2 upper petals. 



T. canadense L Stem 1-3 feet high, simple, hoary-pubescent; leaves lan- 

 ceolate, oblong-lanceolate, or oyate-lanceolate, acute, serrate, short-petioled, 

 green above, whitish beneath; bracts linear- lanceolate, about the length of 

 the calyx; flower-whorls crowded into a long spike; calyx canescent, the upper 



