160 COMMON CANADIAN WILD PLANTS. 



deeply 2-lipped, the upper erect, notched ; the lower spread- 

 ing, 3-parted. Stamens 2, the anther-cells separated. Pod 

 obovate, flat, 4^seeded. 



Okder LXIII. LABIA' TiE. (Mint Family.) ^ 



Hetbs with square stems, opposite leaves (mostly aroma- 

 tic), didynamous (or in one or, two genera niandrous) 

 stamens, a 2-lipped or irregularly 4- or S-lohed corolla, and 

 a deeply 4-lohed ovary, forming in fruit 4 nutlets or achenes. 

 (See Part I., Sectipn 65, for description of a typical plant.) 



Synopsis of tbc Crcucra. 



* Stamens 4, curved upwards^ pai'allel, exaerted from a deep notch on 

 the upper stde of tlie5-lobed corulta. 



1. Teii'criniii. Calyx 5-toothed. The four upper lobes of the corolla 



nearly equal, with a deep notch between tJie upper 2 ; the lower 

 lobe much larger. Flowers pale purple. 



2. Isau'tUiis. Calyx bell-shaped, 5-cleft, almost equalling the small 



pale-blue corolla. Lobes of the corolla almost equally spreading. 

 Stamens only slightly exserted. 



^ * Stamens 4, the outer or lower pair longer^ or only 2 with antherSj 

 straight and not converging in pairs ! Antliers 2-celled ! 



-*- Corolla almost equally 4-lohed, quite small, 



3. Men'llin. Calyx equally 5-toothed. Upper lohe of the corolla 



rather the broadest, and sometimes notched. Stamens 4, of equal 

 lensth, not convergent. Flowers either in terminal spikes or in 

 head-like whorled clusters, often forming Interrupted spikes. 

 Corolla purplish or whitish. 



4. Lyc'opns. Calyx-teeth 4 or 5. Stamens 2, the -upper pair, if any, 



\i%iout anthers. Flowers white, in dense axillary clusters. 



■1- -1- Corolla evidently 2-lipped, hut the lobes nearly equal in size ; the 



tube not bearded inside. Stamens with antliers 2. 



R. Ileileo'ina. Calyx 2-lipped, bulging on the lower side pf the base, 

 hairy in the throat; 2 stamens with good anthers, and 2 sterile 

 filaments with false anthers. Low odorous plants, with bluish 

 flowers in loose axillary clusters. 



H- — -I- Corolla 2-lipped, the lower of the 5 lobes much larger than the 



other 4 ; the tube with a bearded ring inside. Stamens 2 



{occasionally 4), much exserted. 



0. CoIIluso'uia. Calyix oy;ate, enlarged and turned down in fruit, 2- 

 lipped. Corolla elongated, the lower lip toothed or fringed. 

 Strong-scented plants with yellowish flowers on slender pedicels 

 in terminal panicled racemes. 



