DID YNAMIA. GYMNOSPERMIA. 33 
fid. « Middle segment longer. Stamina dis- 
tant; cells of the anthers parallel.” R. Brown. 
Pungently aromatic herbs; flowers capitate, fastigiate, 
bractes cndeetite often subimbricated; flowers small. 
Seeds more or less bearded at the summit. 
Species. 1. P. incanum. Oxs. Leaves shortly petio- 
late, oblong-ovate; flowers in dense cymes; bractes nar- 
row and subulate, bearded at the points; tube and orifice 
of the corolla internally pubescent as in many other spe- 
eies. 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, universal; leaves nearly entire, capituli terminal; 
bractes and calix terminated by long awns; interior of 
the corolla smooth. Has. In Ohio, 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. Ons. Siem purple, smooth, a 
little branched above, about 1 foot high; verticills lor2 — 
below the terminal one; orifice of the corolla pubescent; 
stamina exserted; corolla purplish, spotted; seed bearded. 
at the summit. Has. On the Catawba ridge, North C. 
lina. v. v. 4. Mon a. ea 2 
$. dinifolium. Qs. Very smooth and 1 
branches trichotomous and fastigiate; leaves 
near, sessile, very entire, longitudinally nerved, and act 
capituli terminal, hemispherical, compact, n y simple; 
bractes imbricated, exterior ovate, and aw 5! 
liately-pubescent; flowers pilose, spotted internall 
. ma about equal with the corolla; middle segment of the = 
lower lip, oblong, incurved atthe point. Marginofthe  ~ 
leaves asperate seen through a lens. 6. vinginicum. Ons. | 
Stem erectly branched, pubescent; leaves subsessile, li- 
near-lanceolate, entire, Margin somewhat asperate; capi- 
tuli cymose, sessile; bractes and awned calix pilosely pu- 
' bescent; bractes linear-lanceolate, acuminate; stamina 
exserted; corolla externally pubescent, whitish and ma- | 
ly allied to P. montanum. 
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