PET PET 
PET PEZ 
meros, a part ; the sepals are spontaneously thrown 
off from the flower shortly after they have expanded, 
just as leaves are thrown off the stems of many of 
these plants when they receive a sudden check, and 
then the petals and labellum only remain to consti- 
tute the flower. Linn. 20, Or. 1, Nat. Or. Orchi- 
dacecB. The plant i.s nearly related to Bletia and 
Phaius, but will probably be found to grow best 
under the treatment given to Burlingtonia. 
tetragOna . . . Brown . 12, S. Epi. Maurit. . . 1837 
Petal-like scales in Alsinaceas and Silenacex, the 
scales which are fixed to the throat of the petals. 
Petalostemum, Michaux. From petalon, a petal, and 
stemon, a stamen ; the stamens are joined to the 
petals at the base. Linn. 16, Or. 2, Nat. Or. Legu- 
minosx. Pretty herbaceous plants, growing in any 
border soil ; young plants are readily obtained by 
divisions. Synonyme: 1. Dalea Kuhnistera. 
cfindldum . . .White. . 7, F. Her. P. N. Amer. . 1811 
carneum . . .Flesh . . 7, F. Her. P. N. Amer. . 1811 
corj-mbosum, 1 . White . . 8, H. Her. P. N. Amer. . 1811 
violaceum . . . Violet . . 8, H. Her. P. N. Amer. . 1811 
Petals, divisions of a corolla. 
Petiolate, or petioled, having footstalks. 
PETIOLUI.ATE, having little petioles. 
PetiverTa. Named by Linnaeus in honour of J. 
Petiver, F.R.S., a London apothecary. Linn. 7, 
Or. 1, Nat. Or. Petiveracecs. Ornamental plants, 
growing in a mixture of loam and peat ; they pro- 
pagate readily by cuttings under a glass, 
alliacea .... White. . 6, S. Ev. S. Jamaica . 1759 
octandrS . . . White . . 6, S. Ev. S. W. Ind. . 1737 
Pktrea. Linnaeus dedicated this genus to Robert 
James, Lord Petre, a famous patron of botany, who 
died in 1742. Linn. 14, Or. 2, Nat. Or. Verbenaceoe. 
Beautiful stove plants. P. volubilis is one of the 
most handsome stove twiners we possess. To grow 
them well, they must be planted in good rich 
mould, and kept in a strong heat. They may be 
propagated readily by cuttings under a glass. 
erScta .... Blue . . S. Ev. S. S. Amer. . 1823 
TugosS .... Blue . . S. Ev. S. Caraccas . 1824 
Stapellae . . . Lilac . . 6. S. Ev. Cl. S. Amer. . 
volubilis . . . Purple 7j S. Ev. Tw. Vera Cruz . 1733 
Petrobil'm, R. Brown. From petros, a rock, and bio, 
to live; habitation of the species. Linn. 19, Or. 1, 
Nat. Or. Composites. An ornamental shrub, grow- 
ing well in sandy loam ; and cuttings root without 
difficulty in the same kind of soil. Synonymes : 1. 
Bidens arborea, Spilanthes arborea. 
arbbegum, 1 . . Pa. yeL . S. Ev. S. St. Helena . 1816 
Petrocallis, R. Brown. From petroa, a rock, and 
halos, beautiful ; the plant adorns the rocks on 
which it grows. Linn. 15, Nat. Or. Crucifer oe. 
This little plant is well fitted for ornamenting 
rock-work, or it may be grown in pots, in a mix- 
ture of sandy loam and peat, and is multiplied by 
seeds, or divisions at the root. Synonyme ; 1 . Draba 
pyrenaica. 
P 3 rrenalca, 1 . . Pink . .5,0. Her. P. Pyrenees . 1759 
PETnoMARULA, A. DecandoUc. From petroa, a rock, 
and maron, a bitter herb. Linn. 5, Or. 1, Nat. Or. 
Campanulacex. This plant requires to be grown 
in a sheltered situation, and protected by a frame 
in winter; it may be increased by divisions. Sy- 
nonyme : 1 . Phyteuma pinnala. 
pinnata, 1 . . .Pa. blue . 8, F. Her. P. Candia . 1640 
Petrophila, R. Brown. From petros, a stoiie, and 
phileo, to love; in allusion to the places in which 
the plants are found. Linn. 4, Or. 1, Nat. Or. 
Proteaceoe. A genus of ornamental shrubs, nearly 
related to Protea, to which genus they may be 
referred for culture and propagation. Synonyme: 
1. Protea fucifolia. 
acioularls . . . Wht. red . 5, G. Ev. S. N. Holl. . 1830 
canescens ... G. De. S. N. Holl. . 1830 
diversifolia . . G. Ev. S. N. Holl. . 1803 
fastigiata . . . White . . 7. G. Ev. S. N. Holl. . 1820 
filifolla .... White . . 6, G. Ev. S. N. Holl. . 1824 
pediinculatA . . White. . 7, G. Ev. S. N. Holl. . 1824 
pulchelia, 1 . . White . . 7, G. Ev. S. N. S. W. . 1790 
rlglda .... White . . 6, G. Ev. S. N. HoU. . 1823 
teretifOlia . . . White . . 7, G. Ev. S. N. HoU. . 1824 
trifida .... While. . 7, G. Ev. S. N. HolL . 1820 
PetroseiJnum, From pefros, a rock, and 
selinon, parsley ; habitation of the species. Linn. 
[ 239 1 
5, Or. 2, Nat. Or. Umbelliferae. P. sativum, the 
common Parsley, is a well-known culinary herb. 
The seeds of all the species may be sown in spring, 
in the open ground. Synonymes: 1. Apinm Petro- 
selinum. 2. Sison segetum. 3. Ligusticum pere- 
grinum. 
sativum, 1 . . . Lgt. yeL . 6, H. B. Sardinia . 1548 
segetum, 2 . . . White . . 7» H. A. Britain . . 
peiegrintim, 3 . . White . . 6, H. B. Portugal . 1633 
Petty- WHIN, see Genista anglica. 
Petunia, Jussieu. The Brazilian name for tobacco 
is Petun ; applied to this genus because of its 
affinity with Nicotiana. Linn. 5, Or. 1, Nat. Or. 
Solanacece. A hig’hly ornamental genus of free- 
fiowerihg plants, well adapted for turning out in 
beds or borders during summer. They will grow 
in any light soil, but prefer a mixture of sandy 
loam and vegetable mould ; cuttings will strike at 
any season in heat, care being taken to keep them 
from damp. Synonymes : 1 . Salpiglossis linearis, Nie- 
rembergia intermedia. 2. Nicotiana nyctaginijlora. 
3. P. phasnicea, Nierembergia phaenicea, Salpiglossis 
integrifolia. 
acuminate . . White. . 7, F. Her. P. Chile . . 1827 
AtkinsianS . . Crim. pur. 7, H. A. Hybrid . .1834 
intermedia, 1 . Yel. pur. . 8, F. Her. P. B. Ayres . 1832 
nvctaginiflora, 2 AVhite . . 8, F. Her. P. S. Amer. . 1823 
violacea, 3 . . Rose pur. 8, F. Her. P. B. Ayres . 1831 
Peucedanum, Koch. From peuke, a pine, and dunoa, 
parched ; so named because of its strong resinous 
smell. Linn. 5, Or. 2, Nat. Or. Umbelliferae. The 
species are of no interest, and will grow in any 
common garden soil. Synonymes: 1. Cnidium alsa- 
ticum. 2. Selinum venetum. 3. S. austriacum. 4. 
S. baicalenae. 5. S. peucedanoides. 6. S. polymorphum. 
7. S. Oreoselinurn. 8. S. gallicum. 9. S. elegans, 
P. linear e. \0. S. Bellardi. \\. P. tauricum. 12. P. 
palustre, Thysaelinum palustre. 13. Heracleum pu- 
milum — P. album, alpSstrS, alsatlcum i,A. albiJlOrtim 
2, arendrium, aureum, austriacum 3, baicalenae 4, 
daurienm, involucrutum 5, isetense, longifdliilm, 
montunUm 6, qfficindli, O. itdlicum, Oreoselinurn 7, 
paniculdtBm, parisiense 8, rablSnsS 9, R. Belldrdi 10, 
rnpestri, ruthenicum, R. tauricum 11, seseloidis, 
sibiricum, S. sylvdticum 12, tenuifOlium, VocontiO- 
rum 13. 
Peumus, Persoon. From Peumo, its Chilian name. 
Linn. 22, Or. 2, Nat. Or. Monimiaceae. An odorife- 
rous tree, attaining the height of thirty feet; it 
delights in peaty loam, and ripened cuttings root 
readily in sand. 
frSgrans ... S. Ev. T. Chile , . . 1824 
PeyroCsia, Decandolle. In honour of La Peyrouse, the 
French navigator. Linn. 3, Or. 3, Nat. Or. Iri- 
daceae. A genus of tine bulbous plants, requiring 
the same treatment as Ixia. Synonyme: 1. Galaxia 
plicata. 
aculeate . . . Blu. yel. . 6, G. Bl. P. C. G. H. . 1825 
anceps .... Blue . . 9, F. BL P. C. G. H. . 1824 
corymbosa . . .Blue . . 5, F. BL P. C. G. H. . 1791 
Fabricu . . .Blue . . 6, O. Bl. P. C. G. H. .1825 
falcata .... Blue . .5,0. Bl. P. C. G. H. . 1825 
fasciculate, 1 . . Blue . . 5, G. Bl. P. C. G. H. . 1825 
fissifolla . . . Violet . . 8, G. BL P. C. G. H. . 1809 
silenoldes . . . Violet . . 6, G. Bl. P. C. G. H. . 1822 
Peziza, Dillwyn. Name derived from Pezicas, a tribe 
of fungi in Pliny. Linn. 24, Or. 9, Nat. Or. Fungi. 
This is a very extensive genus, containing some of 
the most beautiful of our fungi, which appear in 
the end of autumn on decayed wood, or in places 
where trees have formerly stood ; they are in the 
form of small undulated scarlet cups. Synonymes : 
1. P. cyathoides. 2. P. epidendra. 3. P. al- 
hella — P. Abbot idnd, acetabfild, aciculdris, asrvgi- 
nSad, agaricind, alLO-spadiced, albo-violdscSns, 
amOrphd, anomdld, arendsd, A. salicind, argilldcid, 
AapegrSnii, atrdtd, atrorufd, atro-virens, aurdntid, 
axilldris, badtd, bicdlOr, boldris, buccind, coerulfd, 
cceaid, calyctilus, campanuld, cSred, cerind, chryao- 
c5md, cinerSd, citrind 1, clandestind, clarOjldvd, 
cochledtd, coccinSd 2, compriasd, concinnd, conigird, 
cribrOsd, cupuldris, domestied, epispharid, erSetd, 
erratlcd, erumpSns, fagined, fasciculdris, Jibiilif dr- 
mis, firmd, fisad, flexSlld, fructigSrd, furfurdcid, 
fused, fuscarioidSs, granuldtd, Grevillii, hemisphee- 
ried, herbdrdm, hirtd, hiapiduld, humOad, hyalind. 
