150 
P T E L E A— P Y CN AN THE MUM. 
psuchos. cocci, otruno, to excite, alluding to 
its properties.] 
la II ceo/ a' ta, ( .) branches 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. (Terehintacecs ) [From ptelea, 
elm, the fruit of this genus resembling that 
of tlie elm.] 
trifolia'ia, (g-w. J. Tpi .) leaves trifoliate ; 
flowers paniclcd, di(Pcious. Var. penta- I 
phyV'lii, leaves quinate. Yar. pjibes"cens, \ 
leaves pube.scent. 6-8 f. i 
baldwiu^'n, leaves vei*y small, glabrous ; 
leafets sessile, oval, obtuse, the terminal j 
ones cuneiform at the base ; flowers tetan- 
drous; styles none. Florida. 
mouophyl"la, leaves simple, lanceolate- 
ovate, nearly se.^sile ; flowers racemed ; 
fruit 3-winged. S. I 
FTE'RIS. 21 — 1. (Filices.) [From pteron, Si \ 
wing, so called from the likeness of its j 
leaves to wings.] | 
aquilifna, (common brake, Ju. 2_f .) frond 
pinnate, 3 parted ; barren branches doubly , 
pinnate, with leafets lance linear, obtuse 
pinnatifid, toothed ; fertile branches pin- j 
nate, with leafets pinnatifid ; divisions aca- 
ti.sh, all ciliate. 
atropiirpu'rea, (rock brake, Ju. 2X.) frond 
pinnate ; lower leafets lanceolate, obtuse, 
ternate or pinnate; at the base obtusely 
truncate or sub-cordate. Var. ve^o'sa, leaf- 
ets veined beneath ; .stipe angled. Var. 
vnncta'ta, leafets punctate beneath ; stipe 
*erete. dark purple. 3-10 i. 
canda'ta, (Au. U..) frond 3-parted, pin- 
nate ; barren divisions bi-pinnate ; leafets 
lineal', elongated, obtuse, entire ; lower 
ones bi-piiinatifid ; fertile branches pinnate ; 
leafets remotish below ; at the base piu- 
natiiid, dentate. 
ped.a.'ta, (Ju. l^.) frond deeply 5-lobed- 
palmate ; lobes pinnatifid ; segments lance- 
linear, acute. 6 i. 
PTEROCAU'LON. 17—2. {Corymhifera;.) [From 
pteron, a wing, and kaulos, a stern.] 
pycnoi^tnclb'ya, (black-root, w. An. 2^.) 
stem erect, simple, winged ; leaves lanceo- 
late, slightly undulate, dentate, tomentose 
and white beneath ; spike cylindric; flow- 
ers clustered. S. 
PTEROSPO'RA. 10—1. (£mc«c.) [From 
pleron, a wing, spora, .seed.] 
(iudrom"ed.(i, (Albany beech-drops, r-y. 
Ju. scape pui-ple, very tall, bearing a 
many-nowered raceme ; flowers lateral 
and terminal, nodding ; peduncles filiform, 
longer than thefl'owers; lanceolate scales 
below, none above. 1-2 f. 
PULMONA'RIA. 5—1. ( Boraginece.) [From 
pul/po, the lung, so called on account of its 
efficacy in diseases of the lungs.] 
virgiii'ica, (b. M. J. 2X-) snjiooth ; stem 
erect ; radical, leaves obovate, oblong, ob- | 
*u.se Haves of tlie stem narrower; flowers i 
m terminal racemes or fascicles ; calyx 
much shorter than the tube of the corolla; 
segments lanceolate, acute ; leaves some- 
what glaucous ; flowers large, bright blue. 
Plant becomes black by drying. 
officina'lh, (spotted lung-wort, b. M. TX-) 
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. nearly glabrous; stem 
simple, assurgent ; leaves spatulate-ovatc ; 
flowers in terminal fascicles, sub-sessile; 
segments of the calyx oblong, obtusish, 
ciliate, about half the length of the corolla. 
6 i. , 
Innceola'ta, (b. w. 2^.) glabrous, erect, 
radical leaves very long-petioled, lanceo- 
late ; cauline ones linear-oblong ; flowers 
Bub-panicled ; calyx short. S. 
cilia' la, (b.) glabrous ; leaves lance-ovate, 
attenuate at each end, ciliate on the mar- 
gin ; flowers fasc.icle-panicled, pedicelled; 
corolla tubular-bell-form; calyx short, 5- 
parted ; .segments ovate, obtuse. If. S. 
PU'NICA. 11—1. (Rosacece.) iF torn punicus, 
Carthaginian.] 
graua'tiim, (pomegranate, ^ .) leaves lan- 
ceolate ; stem woody. Ex. 
PURSH"IA. II— I. (.Rosacea.) [In honor 
of Frederic Pursh, author of the North Amer- 
ican Flora.] 
tridenta'ta, {'^.) 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"THEM{UM. 13—1. (Labiatce.) [From 
puknos, dense, ar^thos, flower, on account of. 
its crowded inflorescence.] 
A. Stamens exsert. 
in"canum, (wild basil, mountain-mint, w. 
r. Ju. IX-) leaves oblong-ovate, acute, sub- 
serrate, white-downy ; flowers in compound 
heads, lateral ones peduncled; bracts se- 
taceous. 1-5 f. 
ariata'tmn, (w. Au. 24^.) 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. 11) 
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"icum, (narrow-leaf Virginian 
thyme, w. J. ZJ].) pubescent ; leaves ses- 
sile, lance-linear, entire, punctate ; heads 
terminal, corymbed; bracts acuminate. 12- 
18 i. Mich. 
B. Stamens included. 
verticillofhim, (w. Au. 2^.) leaves lance- 
ovate, sometimes toothed ; whorls sessile, 
compact ; bracts acuminate. 2 f. Moun- 
tains. 
lanceola' tnm, leaves linear-lanceolate, en- 
tire, veined; heads terminally sessile, in 
fascicled corymbs. 
mu'ticum, (w. Ju. 11-) leaves lance-ovate, 
sub-dentate ribbed, sub-glabrous; heada 
