456 
PTELEA— PYCNANTHEMUM. 
pxHchos, cocH, otruno, to excite, alluding to 
its properties.] 
lanceoWta, (^.) bi-anches and leaves 
reddish, hairy beneath ; leaves lanceolate, 
acuminate at both ends ; stipules clasping, 
roundish, caducous; corymb terminal, 3- 
forked at the base. Florida. 
PTE'LEA. 4—1. (TerebintacecE.) iFrom ptelea, 
elm, the fruit of this genus resembling that 
of the elm.] 
trijolia'ta, (g-w. J.f).) leaves trifoliate; 
flowers panicled, dioicious. Var. penta- 
vhyV'la, leaves quinate. YQx.pubes"cem, 
leaves pubescent. 6-8 f. i 
baldu-in"n, leaves very small, glabrous ; ! 
leafets sessile, oval, obtuse, the terminal 
ones cuneiform at the base ; flowers tetan- 
drous ; styles none. Florida. 
moiiophyVla, leaves simple, lanceolate- 
ovate, nearly sessile ; flowers racomed ; 
fruit 3- winged. S. 
PTE'RIS. 21 — 1.. {Pilices.) [From pteron, a. 
wing, so called from the likeness of its 
leaves to vyings.] 
aquili'na, (common brake, Ju. 2^.) frond | 
pinnate, 3 parted ; barren branches doubly j 
pinnate, with leafets lance linear, obtuse \ 
pinnatifid, toothed ; fertile branches pin- | 
nate, with leafets pinnatifid ; divisions acu- ' 
tish, all ciliate. i 
atrojrurpu'rea, (rock brake, Ju. 2i.) frond ' 
pinnate; lower leafets lanceolate, obtuse, | 
ternate or pinnate; at the base obtusely 
truncate or sub-cordate. Var. leaf- 
ets veined beneath ; stipe angled. Var. 
vuncta'ta, leafets punctate beneath ; stipe 
*erete. dark purple. 3-10 i. 
cauda'ta, (Au. 11.) frond 3-parted, pin- 
nate ; barreii divisions bi-pinnate ; leafets 
linear, elongated, obtuse, entire ; lower 
ones bi-pinnatifid ; fertile branches pinnate ; 
leafets remotit^b below ; at the base pin- 
uatiiid, dentate. 
peda'ta, (Ju. 2^.) frond deeply 5-lobed- 
palmate ; lobes pinnatifid ; segments lance- 
linear, acute. 6 i. S. 
PTEROCAU'LON. 17--2. {Corymbif€ra:.)iFrom 
. pteron, a wing, and kaulos, a stem.] 
pycnostach"ya, (black-root, w. An. 2_f.) 
stem erect, simple, winged ; leaves lanceo- 
late, slightly undulate, dentate, tomentose 
ana white beneath ; spike cylindric ; flow- 
ers clustered. /SJ. 
PTEROSPO'RA. 10—1. (Encm.) [From 
pteron, a wing, spora, seed.] 
androm" ed,a, (Albany beech-drops, r-y. 
Ju. scape purple, very tall, bearing a 
many-flowered raceme ; flowers lateral 
and terminal, nodding ; peduncles filiform, 
longer than the flowers ; lanceolate scales 
below, none above. 1-2 f. 
^ULMONA'RIA. 5—1. ( Boraginece.) [From 
pulmo, the lung, so called on account of its 
efficacy in diseases of the lungs.] 
virgirL"ica, (b. M. J. 2-f.) smooth ; stem 
erect ; radical leaves obovate, oblong, ob- 
'use leaves of the stem narrower; flowers 
'n terminal racemes or fascicles ; caiyx 
much shorter than the tube of the corolla ; 
segments lanceolate, acute ; leaves some- 
ivhat glaucous ; flowers large, bright blue. 
I^Ieut becomes black by drying. 
ojficina'lis, (spotted lung- wort b. M. IX-i 
leaves ovate, hairy, generally speckled 
with white on the upper side ; the lower 
leaves on long petioles, the upper ones ses- 
sile ; flowers violet blue. 12 i. Ex. 
alpi'na, (b. 11.) nearly glabrous; stem 
simple, assurgent ; leaves spatulate-ovate ; 
flowers in terminal fa.scicles, sub-sessile* 
segments of the calyx oblong, obtusish, 
ciliate, about half the length of the corolla, 
6 i. 
lanceola'ta, (b. w. IX) glabrous, erect, . 
radical leaves very long-petioled, lanceo- 
laie ; cauline ones linear-oblong ; flowers 
sub-panicled ; calyx short. S. 
cilia' ta, (b.) glabrous ; leaves lance-ovate 
attenuate at each end, ciliate on the mar- 
gin ; flowers fascicle-panicled, pedicelled; 
corolla tubular-bell-form ; calyx short, 5 
parted ; segments ovate, obtuse. 1 f. S. 
PU'NICA. 11—1. (Rosacea:.) [From punicus, 
Carthaginian.] 
grana'him, (pomegranate, ^.) leaves lan- 
ceolate ; stem woody. Ex. 
PURSH"IA. II — I. {RosacecB.) [In honor 
of Frederic Pursh, author of the North Amer 
ican Flora.] 
trideuta'ta, ( 1? .) branches erect ; branch- 
lets numerous, short; leaves in fascicles, 
simple, 3 toothed, white beneath ; flowers 
terminal or solitary. A North American 
shrub, with small yellow flowers, quite 
hardy. 
PYCNAN"THEMUM. {Labiatce.) [From 
puknos, dense, anthos, flower, on account of 
its crowded inflorescence.] 
A. Stamens exsert. 
in"canu'm, (wild basil, mountain-mint, w. 
r. Ju. 2^.) leaves oblong-ovate, acute, eub- 
serrate, white-downy ; flowers in compound 
heads, lateral ones peduncled ; bracts se- 
taceous. 1-5 f. 
arista' turn, (w. Au. 2J[.) leaves lance 
ovate, sub-serrate, on very short petioles, 
whitish ; heads sessile ; bracts awned ; 
flowers very small, in one or two sessile 
whorls and a terminal head; bracts and 
calyx terminated by long awns. 
linifo'lium, (Virginian thyme, w. Ju. 2^.) 
stem straight, much branched, somewhat 
scabrous; leaves linear, 3-nerved, very en- 
tire, smooth ; heads terminal, in a fascicu- 
late corymb; stem 12-18 inches high, with 
trichotomous, fastigiate branches; flowers 
minute, shorter within. Woods. 
virgin"iatm, (narrow-leaf Virginian 
thyme, w. J. 2^.) pubescent; leaves ses- 
sile, lance-linear, entire, punctate , heads 
terminal, corymbed ; bracts acuminate. 12- 
18 i. Mich. 
B. Stamens included. 
verticilla'tum, (w, Au. 14.-) leaves lance- 
ovate, sometimes toothed ; whorls sessile. 
I compact; bracts acuminate. 2 f. Moun- 
' tains. 
I lanceola'tnm, leaves linear-lanceolate, en- 
tire, veined ; heads terminally sessile, Id 
I fascicled corymbs. 
m«72ftt7??, (w. Ju. 2^.) leaves lance-ovate, 
I Bub-dontale ribbed, sub-giabrous ; heads 
