PON POR 
POR POT 
Pi#cldia . . . White . . 6. Ev. T. E. Ind. . . 1818 
uliginOsa, 2 • . White . . S. Ev. T. W. Ind. . 1824 
PoNTBDERA, Ltnit. In honour of Julius Pontedera, 
professor of botany at Padua. Linn. 6, Or. 1, Nat. 
Or. Pontederacece. The species of this genus require 
to be grown in rich loamy soil, in a tub or cistern 
of water ; increased by division at the roots, 
angustifdlia . . Blue . . 7» S. Aq. P. N. Amer. . 1806 
azarea .... Bide . • 7> s. Aq. P. Jamaica . 1824 
ceeruiea . . * . Blue . . 7. H. Aq. P. N. Amer. . 1830 
cordata .... Blue . . 7i S. Aq. P. N. Amer. . 1759 
crassipas . . . Blue . . 5, S. Aq. P. Guiana . . 1825 
dilatata .... Blue . . 7, S. Aq. P. E. Ind. . .1806 
lanceolata . . . Blue . . 7i S. Aq. P. N. Amer. . 1815 
PoNTHiEVA, R. Brown. Named iae honour of M. de 
Ponthieu, a French West Indian merchant, who 
sent a number of plants to Sir Joseph Banks. Linn. 
20, Or. ],Nat. Or. Orchidacecs. These curious plants 
grow well in a mixture of sandy loam and peat, 
with the pots well drained. They require to be 
kept dry when not in a growing state. 
glandulOsa . . . Green . . 2, S. Ter. W. Ind. . 1800 
petiolata . . . Brown . . 8, S. Ter. St. Vincent 1822 
Poplar, see Populus. 
Poppy, see Papcivir. 
PopulOs, Tournefort. Some derive the word Populus 
from paipallo, to vibrate or shake ; others suppose 
it obtained its name from being used in ancient 
times to decorate the public places in Rome, where 
it was called arbor populi, or the tree of the people. 
Linn. 22, Or. 7, Nat. Or. Salicaceae. Most of the 
species of poplar are very ornamental, more espe- 
cicilly in early spring, when the catkins of the 
males are produced. Their favourite place of 
growth is in moist soil near a running stream ; but 
they do not thrive in very marshy situations. All the 
species are readily increased by cuttings or la 5 'ers, 
and some by suckers. Synonymea : \. P. nivea. 2. 
P. suaveolena. 3. P. viminalis, P. longifoHa. 4. P. 
macrophylla. 5. P. acerifolia. 6. P. dilatata. 7. P. 
acladesca. 8. P. Itevigata. 9. P. aupina. 
4lba, 1 . . . . Apetal . 3, H. De. T. Britain . . 
angulats . . . Apetal . 3, H. De. T. Carolina . 1738 
balsamlf^rS . . Apetal . 4, H. De. T. N. Amer. . 1692 
fol. varieg&tls . Apetal . 4, H. De. T. 
intermedia . . Apetal . 4, H. De. T. 
latifOlia . . . Apetal . 4, H. De. T. 
(uaveOlena, 2 . Apetal • 4, H. De. T. Russia . . 1825 
vimin&lts, 3 . Apetal . 4, H. De. T. Altai . . 1826 
betulifdlia . . . Apetel . 3, H. De. T. N. Amer. . 
canadensis . . . Apetal . 3, H. De. S. Canada . . 
candlcfins, 4 . . Apetal . 3, H. De. T. N. Amer. . 1772 
canSscens . . . Apetal . 3, H. De. T. England . 
acerifolia, 5 . Apetal . H. De. T. 
segyptlOca . . Apetal , H. De. T. Egypt . . 
nrembOrglcS . Apetal . H. De. T. . 1835 
be1glc& . . . Apetal . H. De. T. S. Eur. . . 1835 
cfindlcSns . . Apetal . H. De. T. 
hybrids . . . Apetal . 4, H. De. T. Caucasus . 1816 
nIvOa .... Apetal . H. De. T. 
pendula . . . Apetal . H. De. T. 
fastigiStd, 6 . . Apetal . 3, H. De. T. Italy . . 1758 
foemini . . . Apetal . 3, H. De. T. Italy . . 1838 
gr^i .... Apetal . 3, H. De. T. ArcliipeL . 1779 
grandidentst* . . Apetal . 3, H. De. T N. Amer. . 1772 
pOndula . . . Apetal . 3, H. De. T. N. Amer. . 1820 
heteropbylia . . ApeUl . 3, H. De. T. N. Amer. . 1765 
xnonillfOra, 7 • . Apetal . 5, H. De. T. Canada . . l772 
Lindleyanft . . Apetal . 4, H. De. T. Canada . . l772 
variegSta . . Apetal . 5, H. De. T. 
nigra .... Apetal . 3, H. De. T. Britain . . 
salicifolia . . Apetal . 4, H. De. T. Floetbeck . 1834 
virldls . . . Apetal . 4, H. De. T. Britain Gard. 
tremQla .... Apetal . 3, H. De. T. Britain . . 
laevigata, 8 . . Apetal . 3, H. De. T. N. Amer. . 1760 
pjndula . . . Apetal . 4, H. De. T. 
Eupina, 9 . . Apetal . 3, H. De. T. N. Amer. . 1824 
trapida .... Apetal . H. De. T. N. Amer. . 1812 
PoRANA, Linn. From poreno, to journey ; branches 
extending to a great distance. Linn. 5, Or. 1, Nat. 
Or. Convolvulacect. An ornamental plant, requiring 
a mixture of loam and peat, and increased by seeds. 
volObllls . . . White . 7. S. Ev. Tw. E. Ind. . . 1820 
PoRANTHERA, Rudgc. From poros, a pore, and anthera, 
an anther. Linn. 5, Or. 3, Nat. Or. Euphorbiaceee. 
This ornamentad species grows freely in a mixture 
of sandy loam and peat, and young cuttings will 
root readily if planted in sand, under a glass. 
ericifoUa . . . White . . 7. G. Ev. S. N. Holl. . 1824 
PoHCuyiKB, see Chcetdrid hOstrlx. 
L 255 ] 
Porcupine, see Hordiilm hgatrJx. 
Pores, apertures in the cuticle, through which trans- 
piration takes place, or apertures in the anthers 
through which the pollen is ejected. 
PoRiNA, Achariua. From porinoa, anything that 
crumbles away. Linn. 24, Or. 9, Nat. Or. Fungi. 
A curious species, found on the bark of trees, &c. 
— P. pertuad. 
PoRLiERA, Ruiz and Pavon. In honour of Andrew 
de Porlier, a Spanish patron of botany. Linn. 8, 
Or. 1, Nat. Or. Zygophyllaceie. A curious and 
ornamental shrub, with leaves the linear leaflets of 
which remain open in serene weather, and contract 
before rain. It grows in a mixture of loam and 
peat, and ripened cuttings will root in sand, under 
a glass, in heat. 
hygrometrlca . . S. Ev. S. Peru . . 1820 
PorophyllOs, having porous leaves. 
PoRPHfRA, Agardh. From porphyra, purple; the 
colour of the species. Linn. 24, Or. 7, Nat. Or. 
Algos. Curious purple species, found during summer 
on the sea-shore. P. laciniata is stewed, and con- 
sidered a great luxury — P. lacinidtd, purpuria. 
PoRRECTus, stretched out, diffuse. 
PortlandTa, P. Browne. Named in honour of the 
Duchess of Portland, a great patroness of botany. 
Linn. 5, Or. 1, Nat. Or. Rubiaceos. Superb plants, 
worthy of a place in every collection, on account of 
their large showy flowers. They require a mixture 
of sandy loam and peat ; and cuttings, with their 
leaves whole, will root in sand, under a glass, in 
heat. A strong heat is necessary for them; with- 
out that, they will never grow well, 
coccinga . . . Scarlet . S. Ev. S. Jamaica . 1812 
grandiflora . . . White . . S. Ev. S. Jamaica . 1775 
Portugal laurel, see Ceriaua luaitdnlcfis. 
PoRTULACA, Linn. From pnrto, to carry, and lae, 
milk7 juicy nature of the plants. Linn. 11, Or. 1, 
Nat. Or. Portulacaceos. The seeds of the hardy 
annual species of this genus may be sown in a 
sheltered part of the flower-garden in spring. 
The stove and greenhouse kinds require the same 
treatment as other stove and greenhouse annuals. 
foliOsA .... Yellow . 6, H. A. Guinea . . 1822 
Gilliesli . . . Red pnk. . G. Ev. S. Mendoza . 1827 
grandiflOrS . . Yel. pur. . 6, F. Tu. P. Chile . . 1827 
luwa . . . Yellow . 6, G. Tu. P. Chile . . 1827 
ThelliisCnn . Crimson . 6, G. Tu. P. Mendoza . 1839 
guineensis . . Yellow . 6, H. A. Guinea . . 1823 
nalimoldes . . Yellow . 6, F. A. Jamaica . 1823 
involucres . . Pink . . 6, H. A. . 1820 
meridiSnd . . Yellow . 5, G. A. E. Ind. . . 1791 
mucron&tS . . Yellow . 6, H. A. . 1822 
olerSceS . . . Yellow . 7. H. A*. Europe . . 1582 
parvifdlia . . . Yellow . 6, S. A. Jamaica . 1799 
pilOsd .... Pink . . 6, S. A. S. Amer. . 1690 
puslllii .... Yellow . 6, S. A. Trinidad . 1824 
quadrifida . . Yellow .8 8. A. E. Ind. . .1773 
sativa .... Yellow . 8, H. A. 8. Amer. . 1652 
aurea . . . Yellow . 8, H. A. S. Amer. . 1652 
PoRTULACARiA, Jacquin. Altered from Portulaca. 
Linn. 5, Or. 1, Nat. Or. Portulacaceos. This plant, 
the African Purslane-tree, will grow well in any 
dry light soil ; and young cuttings, taken off and 
dried for a few days, when potted, will root freely. 
The plant has never flowered in British gardens. 
PosoQUERiA, AubW. Aymara poaoqueri is the name of 
P. longiflora among the natives of Guiana. Linn. 
5, Or. 1, Nat. Or. Cinchonaceoe. The species are 
remarkably pretty when in flower ; for culture and 
propagation, see Garderia. Synonymea: 1. Solena 
gracilia. 2. S. longiflora. 
gracHis, 1 . . . White . . S. Ev. S. Guiana . . 1825 
longifiOrA, 2 . . White . . 8. Ev. 8. Guiana . . 1822 
Potamoget5n, Linn. From potamoa, a river, and 
getVon, near; growing in rivers and ponds. Linn. 
4, Or. 3, Nat. Or. Fluvialea. The species of this 
genus mostly grow wholly immersed in water; 
they are increased by seeds, or by dividing the 
roots. The roots of P. natana are said to be eaten 
in Siberia. 
acutifdllum . . Gm. yeL . 6, H. Aq. P. Britain . . 
comprcssum . . Green . . 6, H. Aq. P. Britain . . 
crispum . . . Red . . 6, H. Aq. P. Britain . . 
cuspidatflm . . Green . . 6, H. Aq. P. Britain . . 
densum .... Bed . . 6, H. Aq. P. Britain . . 
