DIDYNAMIA, GYMNOSPERMIA. 
35 
vulgare. On a bluff bordering the Schuylkill, Woodlands; 
abundant. Perennial. July, August. 
2. P. stem upright, very much branched, rough- Unifoiium. 
ish ; leaves linear, 3-nerved, very entire ; capi- 
tuli terminal, fasciculate-corymbose. — Fursh. 
Brachystemum linifolius, Willd. 
B. Virginicum, Mich. 
Thymus Virginicus, L. 
Pycnanthemum Virginicum, Ait. 
Satureja Virginiana, Sp. PI. 2. p. 793. 
Origanum flexuosum, Walt. 
Icon. Herm. parad. t. £18. (Pursh.) Pluk. aim. 
t. 54. f. £. 
Flax4eaved Basil. Virginian Thyme. 
About eighteen inches high. Flowers small, white. Whole 
plant smells like Thyme. On the borders of open damp 
woods, and along water-courses in thickets, frequent. In the 
woods bordering the Mantua-road, and on the bank walks of 
the Delaware and Schuylkill, common. Perennial. July, 
August. 
3. P. stem upright, very much branched, rough- lanceoiatum. 
ish ; leaves linear-lanceolate, veined, very en- 
tire; capituli terminal, fasciculate-corymbose. 
— Pursh. 
Bachystemum lanceolatum, Willd. enum. 
Lance-leaved Basil. 
Resembles No. 2, very much in general habit, but easily 
known from it by the broader leaves. Flowers also white. In 
similar places with No. 2, but less common. Perennial. July 
August. 
4. P. leaves ovate-lanceolate, subdentate, smooth- muticuBo. 
ish ; capituli terminal, bractes lanceolate, some- 
what acute. — Pers. 
Bachystemum muticum, Mich. 
Icon. Mich. fl. am, £. t. 3£. 
About eighteen inches or two feet high. Flowers pale blos- 
som-red. On the margin of a small open wood in the Neck, 
