speciosum, Sw., and D. obovatum, Ett. To the Genus he 
has added, but not without some hesitation, a new species 
from my Herbarium, P. truncata, a native of Texas. From 
all these our plant appears truly distinct, though its affinity 
is doubtless with D. Virginianum. The differences, how- 
ever striking to the eye are, nevertheless, I regret to say, 
difficult to be given in a specific character. The plant is 
much taller, the leaves are broader and more copiously and 
strongly serrated, the spikes more numerous and crowded, 
the flowers dense, nearly erect and closely imbricated : the 
corolla much shorter, less attenuated at the base, and, con- 
sequently, apparently less inflated upwards, of a red-purple 
colour above, almost white beneath, and the upper lip is 
considerably arched. This (as do the other two species of 
the Genus,) inhabits Texas, whence roots were sent to the 
Glasgow, and probably to the other Botanic Gardens in 
this country, by Mr. Drummonp. It flowers during the 
latter end of summer and autumn, and is a hardy perennial. 
Descr. Root much creeping beneath the surface of the 
ground. Stem rising quite erect, five to six feet high, four- 
sided. Leaves opposite, the radical ones broadly elliptical, 
petiolate, upper ones elliptical, lanceolate, sessile, all of 
them coarsely serrated, especially in the upper half, gla- 
brous, bright green, frequently tinged with purple-brown. 
Spikes numerous pedunculated, from the axils of the upper 
leaves, which gradually become small, so that the spikes 
appear paniculated. Flowers in four rows, densely imbri- 
cated, erect. Calyx campanulate, with five distinct, nearly 
equal teeth. Bracteas ovate, shorter than the calyx. Co- 
rolla red-purple above, pale and almost white below, with 
a few reddish spots. Upper lip very concave: lower with 
three almost equal lobes. Tube not strikingly inflated. 
Germen with a yellow linear gland rising above the ger- 
men. 
Fig. 1. Flower with its Bractea. 2. Corolla seen from the underside. 
3. Pistil. 
