36 DIDYNAMIA. GYMNOSPERMIA. 
most imbiicated in a leafy capitulum, very small, and 
nearly white; calix awned, arid and membranaceous, se- 
miquinqvefid; bractes divaricately awned; upper lip of 
the corolla emarginate, arched; lower Riri central 
lobe subcrenate. Flowering time, July. Apparently al- 
_ hed to D. Maildavica, but the leaves are ee ly destitute 
of punctures: scarcely a congener with D. virginianum, 
and closely allied to Welissa. 
Principally a Siberian genus, 
415. MELISSA. L. (Balm.) 
“Calix arid, above nearly flat; upper lip sub- 
fastigiate. Upper lip of the Corolla partly vault- 
ed, bifid; middle lobe of the lower lip cordate. 
Herbaceous, and aromatic; flowers axillary, shortly pe- 
dunculate. 
Specizs. 1. M. eficinalis. In many places common- 
ly naturalized along road sides and lanes. 
An European genus, at present including only 2 species. 
414, *MACBRIDEA.} Elliott. 
«“ Calix subturbinate, trifid; 2 of the segments 
larger and oval, the 3d linear-lanceolate. Co- 
rolla ringent; upper lip entire, the lower shorter 
Me pulehra.” 
Sok le Thymbra caroliniana. Walter, p. 162” Haz. “ In 
the narrow swamps anil Bay-galls in r thie central parts of 
- South Carolina. Flowering from July to September.” 
ae Ettiatt, Mss. Apparently allied to Melittis. 
PRUNELLA. L. (Self-heal.) _ 
the stamina. forked, only one of the } 
_theriferous, _Stisma bifid. 
weit d bys ; di pees uae 
pper lip of the calix dilated. — Filaments of 
aks 
