Labiate—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. Moldavicwm.—A fragrant annual about 18 inches high. 
Leaves oblong-lanceolate, sharply-toothed. Flowers small, blue, 
in the axils of the upper leaves. 
D, Ruyschitenwm has also small blue flowers with hairy 
calyces. 
Cedronélla is very near the last genus, except that the 
anther-cells are parallel instead of diverging. (C. cana is a 
hoary perennial with small ovate-cordate leaves and bright red 
flowers; C. Mexicdna a more robust species destitute of hoary 
down, with interrupted spikes of less brightly-coloured flowers. 
Both are natives of Mexico. 
Melittis Melissophgllum, 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 grandiflora 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, PHYSOSTRGIA. 
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 ¢ioa, a bladder, and o-¢yw, to cover, in 
allusion to the inflated flowers. 
1. Ph. imbricdta.—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 
