70 
DIDYNAMIA GYMNOSPERMIA. 
centibus ; racemis sub- 
verticillatis, terminali- 
bus ; bracteis calyce 
duplo longioribus. 
ry, racemes somewhat 
verticillate, terminal ; 
bracteas twice as long 
as the calyx. 
Sp. pi. 3. p. 22. Walt. p. 161. Mich. 2. p. 1. Pursh, 2. p. 405* 
Smith in Rees’ Cyclop. 
Root perennial. Stem herbaceous, erect, 2—3 feet high, square with 
the angles rounded, furrowed, somewhat jointed, pubescent. Leaves op- 
posite, brachiate, somewhat rugose, hoary and almost tomentose under- 
neath, on very short petioles. Racemes terminal. Flowers r generally 
verticillate, 4 — 6 in each whorl, the upper flowers irregular; bracteas su- 
bulate at the base of each peduncle, about as long the calyx. Peduncles 
short. Ccdyx pubescent, ribbed, erect, 5-cleft, the three upper segments 
broad, the two lower narrower, all acute. Corolla pubescent, pale blue 
or violet coloured, the tube as long as the calyx, the upper lip divided in- 
to two distant acute segments, the fissure extending into the tube, the low- 
er lip elongated, 3-cleft, the middle lobe extended and rounded. Fi la- 
ments 4, prominent between the division of the upper lip. Style as long 
as the stamens. Stigmas 2, acute. Seeds 4, covered by the persistent 
calyx. 
The two American species of this plant, are still insufficiently discrim- 
inated. It will be perceived by the foregoing description, that our south- 
ern plant agrees in its bracteas and perhaps its petioles with the next spe- 
cies, while its leaves belong to the T. canadense. 
Grows in wet soils, very common. 
Flowers July — September. 
2. VlRGINICUM. 
T. pubescens; foliis 
©vato-oblongis serra- 
tis, superioribus sub- 
sessilibus, caule erec- 
to; racemis verticilla- 
tis, confertis; bracteis 
longitudine calycis. 
Sp. pi. 3. p. 22. Walt. 1. p. 6x. 
Pubescent ; leaves 
ovate, oblong, serrate, 
the upper ones nearly 
sessile ; stem erect; 
racemes verticillate, 
crowded; bracteas as 
long as the calyx. 
Pursh 2. 
This doubtful or obscure species is said to grow in bogs. Pursh. I 
have however a specimen sent me from Pennsylvania by Mr. Nuttall as 
the T. virginicum, in which the leaves are more ovate, on longer footstalks 
and evidently less discoloured than in our common species. I can in this' 
specimen discover no other difference. 
Grows in wet ground from Pennsylvania to Carolina. 
Flowers probably like the other species from July to September. 
