PARNA S SI A-PENTHORUM. 
123 
lacmiate, roundish, somewhat entire ; receptacles scattered, margin mcurv 
ed, entire, at length pulverulent. On old timber, &c. 
PARNASSIA. 5—4. { Saxifrages..') [Fi-om Mount Parnassus, tlie seat of the Muses.] 
america'na, (flowering plantain, w. y. p. Ju. %.) leaves radical, (often a leaf 
on the scape,) heart-orbicular, 5-9-nerved ; nectaries 5, each divided into 
3 filaments terminated by little spherical heads. Damp or wet. 6-18 i. 
palus"tris, leaves all cordate , cauline ones sessile ; scale smooth, many- 
bristled ; flowers white, with veins of green or purple. Bog meadows. 
PASSIFLORA. 15 — 5. {Cucurbitacecs,.) [The term Jlos passionis, or passion-flower, waf3. 
before the time of Linnaeus, apphed to this beautiful genus, because the instruments A 
Christ's passion were thought to be represented by the parts of the flower.] 
ccBTu'lea, (blue passion-flower, b. Ju, P^.) leaves palmate, 5-parted, entire; pe 
tioles glandular; involucrum 5-leaved, entire ; threads of the crown shorter 
than the corolla. Ex. 
hiie'a, (yellow passion-flower, y, S. %..) leaves cordate, 3-lobed, obtuse, nearly 
smooth ; petioles without glands ; peduncles axillary, in pairs ; petals much 
longer than the calyx ; stem climbing and slender. Banks of streams. 
incarna'ta^ (w. p. Sept. % ) leaves smooth ; petioles with 2 glands ; involu- 
crum 3-leaved ; leafets lanceolate, glandular-serrate; stem long, climbing; 
petals white; nectary purple, longer than the corolla; fruit sub-acid and 
spongy, eatable. 
ala'ta, (winged passion-flower, Oct. T^.) leaves oblong-ovate, sub-cordate, 
entire, veiny; petioles with 4 glands; stipules lance-falcate; stem 4-cor- 
nered. Ex. 
PASTINACA. 5—2. (JJmhelliferos,.') [From ^jasco, to feed.] 
sati'va, (parsnip, y, Au. leaves simply pinnate ; leafets glabrous. Var. 
arvensis, leafets sub-pubescent. This variety is often found in situations 
which almost prove it to be indigenous. 
PEDICULARIS. 13—2. {Pedicular es.) [Fromi^ediCMZMs, a louse.] 
canaden'^sis, (louse-wort, y-p. M. %.') stem simple ; leaves pinnatifid, gash- 
toothed ; heads leafy at the base, hirsute ; corolla with a setaceous, 2-tooth- 
ed upper lip ; calyx obliquely truncate. 6-12 i. 
PELARGONIUM. 15^-7. (Gerania.) [From pelargos, a stork, on account of the shape of the 
pericarp, which resembles a stork's bill.] 
A. Nearly stemless ; roots tuberous, 
tris^te, (mourning geranium,) umbel simple ; leaves rough-haired, pinnate ; 
leafets bi-pinnatifid ; divisions oblong-acute ; flowers dark green. 
daucifo'lium, (carrot geranium, %..) scape very simple; leaves thrice pinnate, 
hirsute ; leafets lance-linear. 
B. Leaves simple, not angled. 
odoratis^'simum, (sweet-scented geranium, T^.) peduncles sub-5-flowered ; 
leaves round-cordate, very soft. 
C. Leaves simple, more or less angled, or lobed. 
zona'le, (horse-shoe geranium, T^ ) umbels many-flowered; leaves heart-orbi- 
cular, obsoletely lobed, toothed, with a coloured zone around or near the 
margin. 
in^'quinans, (scarlet geranium, T2 ) umbels many-flowered; leaves round-ren- 
iform, hardly divided, crenate, viscid-downy. 
acerifo'lium, (lemon or maple-leaf geranium, I7.) umbels about 5-flowered; 
leaves 5-lobe-palmate, serrate; below wedge-form, undivided. 
capita' turn, (rose-scented geranium, T^.) flowers capitate ; leaves cordate, 
' lobed, v.'aved, soft ; stem diff"use. 
quercifo'lium, (oak-leaf geranium, T7.) umbels sub-many-flowered ; leaves cor- 
date, pinnatifid, crenate ; sinuses rounded ; filaments ascending at the apex. 
grave' olens, (sweet-rose geranium, Tj.) umbels many-flowered, sub-capitate ; 
leaves palmate, 7-lobed ; divisions oblong, obtuse ; margins revolute. 
PENTHORUM. JO— 5. (SempervivtB.) 
sedoi'des, (Virginian orpine, g-y. Ju. ^4..) stem branching, angled ; leaves 
lanceolate, sub-sessile, unequally and densely serrate ; spikes secund, ter- 
minal, panicled, alternate and cymed ; seeds pitted. 12-18 i. S. 
