i 
AN ENCYCLOPÆDIA 
OF HORTICULTURE. -257 
Pyrethrum—continued. 
border, and in the achenes being angular but not winged” 
(Lindley and Moore). All the species here described 
are hardy, herbaceotis perennials. For culture, &e., see 
Chrysanthemum. 
y 
H 
Fic. 331. FLOWER-HEADS OF PYRETHRUM FRUTESCENS, 
P. achillesefolium (Achillea-leaved).* l.-heads golden-yellow, 
almost globular, few, on long stalks, and_ disposed in loose 
corymbs; inner scales of the involucre round, white, and trans- 
parent at the oR Summer. 1. pinnatifid, with pinnate segments, 
covered with si Si down when young, and pubescent when full 
own. h. 2ft. Caucasus, 1823, A variety known as pubescens 
as numerous heads arranged in broad corymbs. 
P, co bosum (corymbose).* l.-heads white ; peduncles corym- 
thee > Involaeral pest dey ——— with fuscous, scarious 
margins, July. l. pinnatisect ; segments lanceolate, pinnatifid, 
i 
Fic. 332. UPPER PORTIONS OF PLANT OF PYRETHRUM ROSEUM. 
wm 
Pyrethrum—continued. 
the lobes acute and argutely serrated. Stem erect, angular, 
branched at apex. A. lft. — Parking &c., 1596. (J. F. A. 379, 
under name of Chrysanthemum corymbosum.) ; 
P. frutescens (shrubby). _/l.-heads with white ray florets. h. 3ft. 
Canary Islands, 1699. From this species a great number of 
varieties have sprung. See Fig. 331. See also Chrysanthemum 
frutescens, 
P. lacustre (lake-loving). fl.-heads pure white, with a yellow 
centre, about 2in. across, solitary, terminal an . Late 
summer, J. alternate, numerous, sessile, ovate-lanceolate, 
coarsely and irregularly toothed, h, 2ft. to 24ft. Portugal. 
P. enifolium aureum (golden Parthenium- leaved).* 
Golden Feather. A free-growing and well-known, hardy plant 
extensively used for carpet beds and edgings. Seeds ould 
be sown, in a gentle heat, during March. The seedli grow 
very rapidly, and will be ready for planting out in y or 
early in June. The flower-buds must be picked off whenever 
they appear. 
P. Parthenium (Parthenium). Common Pellitory or Feverfew. 
Jji.-heads with a yellow disk and white ray, disposed in a corym- 
bose panicle. June. J. stalked, compound, flat; leaflets ovate, 
innatifid and toothed. Stem erect. h. 2ft, Europe eer 
The whole plant has a strong and bitter smell. (F. D. 674, 
under name of Matricaria Parthenium ; Sy. En. B. 715, under 
name of Chrysanth Parthenium). The double-flowered 
form is largely grown, and is very handsome. | 
* fhs 
spe — =< 
Fig. 333. PYRETHRUM ROSEUM FLORE-PLENO. 
themum, solitary; ray florets rose-coloured ; dis] w. 
— with decurrent, lanceolate segments of a vivid green 
colour. h.' lft. to 2ft. nt. This species, with one or two 
used in the manufacture of powders.” See 
—— , (B. R. 1084; B. M. 1080, under name of Chrys- 
anthemum coccineum.) A large number of varieties, varying 
much in size and colour of fiower-heads, are now grown; there 
is, too, a large series of double forms, one of which is repre- 
sented in Fig. 333. ' 
P. Tehihatchewii ——— — eih a yellowish 
a pure white ray, small, solitary, on axillary 
Pog g griy Early summer. l. bipinnatifid, glabrous, dark 
green, toothed at the base of the tiole. Stems very numerous, 
rooting. h. 2ft. Asia Minor, 1869. A handsome species, form- 
ing a dense tuft. It thrives remarkably well on slopes, dry 
banks, and under trees where grass will not grow. The seeds, 
by which it is mostly increased, should be sown in pots or 
ans, and the seedlings, when large enough, transplanted to 
Their permanent quarters at about in. apart. 
P. — (moisture-loving).* Great Oxeye. jl.-hħeads with 
a yellow disk and a white ray, over 2in, across, on slender and 
fully-bending stalks, August. /. sinooth, lanceolate, sharply 
——— about 4in. Jong, sessile. Stems stout. h. 5ft. Eastern 
Europe, 1816, A very bold and strong-growing species, having a 
handsome and distinct eo when covered with a pro- 
fusion of its blossoms. is — hardy, and prefers a 
rather shelt ituation. (B. M. 2706.) 
PYRGUS. A synonym of Ardisia. 
PYRIFORM. The same as Pear-shaped (which 
see). 
PYROLA (a diminutive of Pyrus, the Pear-tree; 
so-called from some fancied resemblance in the foliage, 
which is not obvious). Wintergreen. ORD. Ericateœ. 
A genus comprising about fourteen — hardy, 
