L abiatce Dracocephalum. 367 



species, from 1 to 2 feet high, with lanceolate entire glabrous 

 leaves and large blue flowers in spikes of whorls. A native of 

 Siberia, flowering in Summer. 



3. D. Moldavicum. A fragrant annual about 18 inches high. 

 Leaves oblong-lanceolate, sharply-toothed. Flowers small, blue, 

 in the axils of the upper leaves. 



D. Ruyschianum has also small blue flowers with hairy 

 calyces. 



Cedronella is very near the last genus, except that the 

 anther-cells are parallel instead of diverging. 0. cana is a 

 hoary perennial with small ovate-cordate leaves and bright red 

 flowers ; G. Mexicana a more robust species destitute of hoary 

 down, with interrupted spikes of less brightly-coloured flowers. 

 Both are natives of Mexico. 



Melittis Melissophyllum, including M. grandiflora, Bastard 

 Balm, is one of our handsomest native Labiates. It is an erect 

 perennial with ovate-oblong crenate slightly hairy leaves and 

 few-flowered axillary whorls of white and pink or purple showy 

 flowers. The variety grandiflbra is very handsome. This 

 plant is remarkable for the large campanulate membranous 

 calyx and nearly flat upper lip of the corolla. It is only found 

 in the southern parts of England. 



9. PHYSOSTEGIA. 



Tall perennials with rather showy flowers remarkable for 

 the inflated calyx and inflated bilabiate corolla enclosing four 

 stamens. The species are natives of North America and Asia. 

 The name is from <0<ra, a bladder, and a-reyw, to cover, in 

 allusion to the inflated flowers. 



1. Ph. imbricata. A showy perennial from five to seven 

 feet high. Cauline leaves sessile, lanceolate, acute, glabrous. 

 Flowers in terminal bracteate spikes, pale purple, spotted on 

 the lower lip. A native of Texas, blooming in Autumn. 



Ph. speciosa, from Siberia, has pink flowers ; and Ph. Virgi- 

 niana has lilac-purple or white flowers and linear-lanceolate 

 leaves. 



10. LAMIUM. 



Annual or perennial hairy decumbent herbs with axillary 

 or terminal bracteate whorls. Calyx tubular-campanulate, 5- 

 toothed. Corolla-tube naked, or with a ring of hairs within 

 the dilated throat; upper lip deeply concave, lower 3-lobed. 

 Stamens 4 ; anthers cohering in pairs, cells divergent. Nutlets 



