BIGNONIALS. 479 
contains an anatropal ovule; when at maturity, each cell becomes 
an achene. The seed encloses a straight embryo surrounded by a 
fleshy albumen, slightly developed. 
All the Labiateze possess similar characteristic organs of vege- 
tation to those described, with some slight differences, depending 
on the shape of the calyx, that of the corolla, or the number and 
relative dimensions of the stamens. For instance, the Sages and 
Rosemaries, instead of having a calyx with five equal or nearly 
equal. teeth, have a bilabiate calyx. They are campanulate or 
infundibuliform in shape, with nearly equal lobes. The sages have 
two stamens. These stamens have an anther of a very remarkable 
structure; the connective is very long, and is placed perpen- 
dicular to the filament, like the beam of a balance. At one 
extremity of this beam is a cell filled with pollen; at the other 
an appendage which represents the other cell, which is abortive. 
Most species of the extremely natural family of the Labiatex are 
endowed with stimulating properties, due to an essential aromatic 
oil, which resides in the glands placed under the epidermis. The 
Common Sage and many other species of the genus are thus 
gifted ; so also is the Rosemary (Rosmarinus officinalis), the Wild 
Thyme (Thymus serpyllum), Peppermint (Mentha piperita), and 
the Common Balm (Melissa officinalis), from all which useful medi- 
cines are obtained by distillation. 
The Ground Ivy (Glechoma hederacea), the Hyssop (Hyssopus 
officinalis), which are also consecrated to medical usage, are 
efficacious as bitters and aromatics. The Teucrium chamedrys is | 
also sometimes employed in medicine. The bitter principle exists 
almost exclusively in this plant. 
BIGNONIALS, 
which conclude the series of perigynous Exogens, have dichla- 
mydeous, monopetalous, unsymmetrical flowers, capsular or berried 
fruit, consolidated carpels, and embryo with little or no albumen. 
baceous plants, leaves ite or alternate ; flowers axillary, : 
en eonen orem five ual parts ; corolla monopetalous ; t CCLIX. Pedaliacez. 
parietal placentze ; bony or ar ruik. \ 
hee ae fleshy poh or shrubs; JE og es fosne, Bons a 
ers sho’ in racemes or pani 3 calyx —e ; : 
five-parted ; tana hh i tubular ; stamens two, didynamo CCLX. Gesneraces, 
anthers two-celled, cohering. 
