PSY [ ", 



to the weather. After this skin, the wing 

 rudiments very distinctly make their 

 appearance, and become larger and 

 whiter the nearer the insect approaches 

 to the perfect state. The body is also 

 of a light green, and the larvae have 

 black eyes, and blackish antennas. At 

 last the time arrives when the insect 

 assumes the perfect state ; it then re- 

 tires to a part of the leaf which it had 

 selected, and after having firmly fixed 

 itself there, the back splits open, and 

 the beautiful winged chermes appears 

 from the nymph. The back of the 

 thorax is of a light green, the abdo- 

 men is marked with yellow rings, and 

 the membranous wings with strongly 

 marked snow-white veins. 



P. cratcegi infests the camellia. 



P.ficus and P. rasce, are respectively 

 on the fig and rose-trees. All the 

 species are destroyed by syringing with 

 tobacco-water, until the insects are 

 dead, and then syringing with water 

 only. See Aphis. 



PTE'LEA. Shrubby Trefoil. (From 

 plao, to fly; winged fruit. Nat. ord., 

 Xanthoxyls [Xanthoxylacese], Linn., 

 i-Tctrandria 1-Monogynia.) 



Pinnata requires a greenhouse); cuttings of 

 ripe shoots, in sand, under a hand -glass ; sandy 

 loam and peat. Trifuliata and its variety are 

 hardy ; seed in April, and by layers in autumn ; 

 any common light soil. 



P. pinna' ta (leafleted), 20, White, May. 

 Norfolk Island, 1829- 



trifotia'ta (three-leaved). 12. Green. June. 



North America. 1704. 



variega'ta (variegated.-feauf), 12. 



Green. June. 1840. 



PTELI'DIUM. (So named from its 

 resemblance to Ptelea. Nat. ord., 

 Spindlelrees [Celastracea?]. Linn., 4- 

 Tetrandria \-Monogynia.') 



Stove evergreen shrub. Cuttings of young 

 shoots, in sand, under a glass, in heat ; sandy 

 peat and fibry loam, with pieces of charcoal. 

 Winter temp., 50 to 60 ; summer, 60 to 85. 

 P. ova 1 turn (egg-leaved). 6. Greenish white. 

 Madagascar. 1818. 



PTE'RIS. Brake. (From pteron, & 

 wing; the shape of the fronds or 

 leaves. Nat. ord., Ferns [Polypo- 

 diaceae]. Linn., 2-Cryptogamia 1- 

 Fiticcs.) 

 All brown spored. See Ferns. 



HARDY. 



P, AquUi'na (eagle-like), 3, July, Britain, 

 48 



PTE 



P. arge'ntea (silvery), . July. Siberia. 1816. 



atropurpu'rea (purple). i- August. J>. 



America. 1770. 



cauda'ta (tailed). 2. October. N.America. 



eda'/a (double-lobed). . July. Virginia. 



GREENHOUSE. 



P. argu'ta (sharp-notched). 1. August. Ma- 

 deira. 1/78. 



Cre'tica (Cretan). ,*1. July. Catrdia. 1820. 



escule'nta (eatable). 3. August. N. b. 



Wales. 1815. 



falca'ta (sickle-shaped). 1. June. New 

 Holland. 1820. 



intra-margina'lis (within -margined). 1. 



September. Mexico. 1828. 



Kingia'na (King's). June. Norfolk Island. 



1831. 



latizo'na (broad-zoned). l. June. More- 



ton Bay. 1831. 



subverticilla'ta (slightly - whorled). I* 



Mexico. 1831. 



tre'mula (trembling). 3. July. N. Hol- 



land. 1820. 



umbro'sa (shady). 3. July. N. Holland. 



1823. 



STOVE. 



P. Alloso'rus (Allosorus-like). 1. 



a'mpla (large). 6. July. 



- calome'lanos (neat-dark). 3- September. 



C. of G.Hope. 1830. 



Cervante'sii (Cervantes's). 1. July. Mexico. 



1824 



C7ime'szV(Chinese). 2. July. China. 1824. 



colli'na (hill). *. August. Brazil. 



corda'ta (heart-shaped). 3. June. Mexico. 



1820. 



crenula'ta (scolloped). 2. July. 1827- 



di'scolor (two-coloured). 3. August. Brazil. 



1825. 



edu'lis Datable). 3. New Zealand. 1837. 



e'legans (elegant). 3, August. East Indies. 



1824. 

 felosi'na (heavy-smelling), 15. July, Jamaica. 



1822. 



flexuo'sa (zig-zag). 1831. 



heterophy'lla (various - leaved). 4. July. 



Jamaica. 1820. 



la'ctea (milky). 1. November. 



lanugino'sa (woolly). 3. July. Bourbon. 



1819. 



la'ta (broad). 3. June. Brazil, 1841. 



longifo'lia (long-leaved). 2. August. W. 



Indies. 1770. 



Peruvia'na (Peruvian). October. Peru. 



1830. 



Plumie'ri (Plunder's). 2. July. S.America. 



1818. 



rotundifo'lia (round-leaved). l. July. N. 



Zealand. 1824. 



sagitta'ta (arrow-shaped). 8. June. S. 



America. 1826. 



sermla'ta (saw-edged). lj. August. India. 



1/70. 



spinulo'sa (small-spined). 1*. September. 



1834. 



sulca'ta (furrowed), fi. June. Jamaica, 



1841. 



- tcrnifo'lia (three-lcared), 1.. June. 1838, 



