DIDYNAMIA. GYMNOSPERMIA. 53 



fid. « Middle segment longer. Stamina dis- 

 tant; cells of the anthers parallel." R. Brown. 



Pungently aromatic herbs; flowers capitate, fastiglate, 

 bractes numerous, often subimbricated; flowers small. 

 Seeds more or less bearded at the summit. 



Species. 1. P. incanum. Obs. Leaves shortly petio- 

 late, oblong-ovate; flowers in dense cj'mes; bractes nar- 

 row and subulate, bearded at the points; tube and orifice 

 of the corolla internally pubescent as in many other spe- 

 cies. Pubescence on the under side of the leaves double, 

 the lowest appearing- in minute floccose spots and pro- 

 ducing- the canescence. 2. aristatum. Pubescence mi- 

 nute, univei'sal; leaves nearly entire, capituli terminal; 

 bractes and calix terminated by long- awns; interior of 

 the corolla smooth. Hab. In Oh'io, Kentucky, Tennessee, 

 and the mountains of North Carolina. The calix when 

 bruised gives out the scent of Lavender. 



3. montanum. Smooth; leaves ovate-lanceolate, serrate, 

 subsessile; capituli proliferous; bractes ciliate, and acumi- 

 nated; calix smooth, dentures awned, partly piliferous; 

 corolla externally smooth. Ocs. Stem purple, smooth, a 

 little branched above, about 1 foot high; veiticills 1 or 2 

 below the terminal one; orifice of the corolla pubescent; 

 stamma exserted; corolla purplish, spotted; seed bearded 

 at the summit. Hab. On the CataAvba ridge, Nortli Caro- 

 lina. V. V. 4. J^lonardella. 



5. JJnifolium. Obs. Very smooth and much branched, 

 branches trichotomous and fastigiate; leaves crowded, li- 

 near, sessile, very entire, longitudinally nerved, and acute; 

 capituli terminal, hemispherical, compact, mostly simple; 

 bractes imbricated, exterior ovate, and awned, margin ci- 

 liately-pubescent; flowers pilose, spotted internally; stami- 

 na about equal with the corolla; middle segment of the 

 lower lip, oblong, incurved at tjie point. ]Margin of the 

 leaves asperate seen through a lens. 6. xdrginicum. Obs. 

 Stem erectly branched, pubesceiU; leaves subsessile, li- 

 near-lanceolate, entire, margin somewhat asperate; capi- 

 tuli cymose, sessile; bracles anrl awned calix pilosely pu- 

 bescent; bractes linear-lanceolate, acuminate; stamina 

 exserted; corolla externally pubescent, whitish and ma- 

 culate, intermediate segment of the lower lip longer, ob- 

 long, inciin-ed at the point. Thumus virginicus. L. P. 

 lti7iceolatiim. Vn. Y.imiticum. S. verticillatum. Apparent- 

 ly allied to P. montanum. 



" 9, * pilofium. Stem and under side of the leaves more 

 or less pilose, leaves Unceolatc, nearly entire, sessile; ca- 



