AN ENCYCLOPADIA 
OF HORTICULTURE. 211 
Potato Beetle—continued. 
locality, at a distance from other habitats, as must be- 
the case in their appearance anywhere in Europe. 
For other Beetles destructive to Potatoes, see remarks 
on InsEcTs under Potato. 
POTATO ONION. A variety of Onion, cultivated 
in much the same way as Shallots. Single bulbs may 
be planted in. January, or as early in spring as weather 
permits, in rows about 12in. apart, a distance of 6in. 
being allowed in the rows. The produce is useful for 
an early supply. Increased only by tubers. 
POTATO, SPANISH or SWEET. 
name applied to Batatas edulis (which see). 
POTENTILLA (a kind of diminutive from potens, 
powerful; alluding to the reputed medicinal 
power, of which these plants really possess very 
little, being merely mild astringents, like the 
rest of the tribe). Cinquefoil. Including Com- 
arum, Horkelia, Sibbaldia, and Tormentilla. 
ORD. Rosacew. <A large genus of glabrous, 
pilose, or silky-tomentose, mostly hardy sub- 
shrubs or herbs, rarely annuals. According to 
the authors of the “Genera Plantarum,” the 
species number about 120, although upwards 
of 220 hav. been accorded specific rank 
by various authors. They are natives of the 
temperate and frigid regions of the Northern 
hemisphere, rarely occurring in the tropics; 
only two species have been found in the 
Southern hemisphere. Flowers white or 
yellow, very rarely red or purple, often 
disposed in corymbose cymes, rarely axillary 
and solitary; calyx persistent, with a concave, 
hemispherical, or urceolate tube, and five (rarely 
four) erect or spreading, -ovate, val- 
vate lobes; petals five (rarely four), obovate, 
orbiculate, or linear-spathulate ; stamens usually 
numerous. Leaves alternate, or the fioral ones 
opposite, digitately three to seven-foliolate or 
impari - pinnate; leaflets solitary, or bi- or 
ternate, often lobed or divided ; stipules adnate 
to the base of the petioles. Several species 
of this genus are very desirable subjects for 
rockwork, bare banks, and similar situations; 
they thrive in almost any moderately good 
garden soil, but a sandy one is preferable. 
Potentillas may be readily propagated by divi- 
sion, or by seeds. Some of the hybrid forms 
are of far more importance to horticulturists 
than the typical species. The undermentioned are hardy 
—— perennials, except where otherwise specified. 
— hite). cites — orange Cin is tho tans, 
35 
er than the calyx; 
l., lower 
weak. 
A common 
cmos of five, sorely SS 
— 
A. rich pelor, serat olay ae chong 
sager Aa foliage. — l. green, 
malaya, 1851. A creeping 
dense mass. A. 6i oh 
4613. 
P. insignis (remarkable). A synonym of P. argyrophylla. 
Potentilla—continued. 
P. atrosanguinea (dark red). A synonym of P. argyrophylla 
atrosanguinea, 
P. Clusiana (Clusins’). in terminal corymbs; corolla white, 
— petals roundish, ardly longer than the calyx. June to 
August. l, radical ones quinate, cauline ones ternate ; leaflets 
oval-cuneiform, pubescent, tridentate at apex, with connivent 
teeth. . 6in. Eastern Europe, &c., 1806. (B. M. 1327; 
J. F. A. 116.) 
P. Comarum (Comarum). Marsh Cinquefoil or Potentil. This 
is the correct name of the plant described in this work as 
Comarum palustre, 
P —— (crowded).* fl. crowded, terminal; corolla white ; 
petals longer than the calyx; outer calyx segments —— entire. 
August, T radical ones pinnate ; leaflets ers E cut at 
the apex. h. lft. to 2ft. California, 1826. (B. M , under 
name of Horkelia congesta.) 
P. formosa (beautiful). A synonym of P. nepalensis. 
Fic. 265. POTENTILLA FRUTICOSA, showing Flowering Branch, detached 
Flower, with Petals removed, and Carpel. 
— en the ey cals. AR. quinats, ; petals obcordate 
te-ti beneath. 
— ed at apex. A. lft. to 2ft. North Aiserica, 
(B. M. 2984.) 
(B. —* 75.) 
. Hopwoodiana (H * fl, petals beautifully variegated, 
— — at the base, and from if 
ntre of a pale straw bright rose- 
pad eo grou and duly. È; — ser ones wh Be on * or — 
ones ternate ; f rseiy erp 
on both h. 1} A a” (B. R. 
corymbose 
. laciniosa leaved ow, disposed in 
—— — Ee eae — the calyx. June 
i, with five yel seven — 
he itt. to to lift. 
1478.) 
Hungary, 
