Perilla 



( 178) 



Peronea 



form of little cysts (peridia), which contain the 

 minute, orange coloured spores. Elatinuiu (*//. 

 yEcidium elatinum) causes swellings upon the bark 

 of the Silver Fir (Abies pectinata) ; Pini and its 

 variety acicolum do the same for the Scotch Fir 

 (Pinus sylvestris) and the Austrian Fir (P. Laricio 

 austriaca). The so-called witch besoms upon these 

 trees are caused by the fungus. The remedy is 

 the excision of the diseased brandies as soon as 

 the swellings appear. Badly infested trees should 

 be burnt, to prevent the spread of the disease. 

 P. Pini usually restricts its attentions to trees under 

 twenty years of age. Recent researches prove that 

 this fungus is a stage in the life history of Coleo- 

 sporium Senecionis, which preys upon Groundsels 

 and Ragworts, therefore such weeds should be 

 destroyed. 



PERILLA (syn. DENTIDIA). 



A genus of half-hardy annuals (ord. Labiatse) 

 used for bedding, for which their tine, dark foliage 

 is very useful. Propagated by seeds, sown in 

 gentle heat in the middle of March, the seedlings 

 being pricked off and hardened before being 

 planted out at the end of May. Soil, light and 

 rich. The flowers are of no value and should be 

 pinched off. 



Principal Species and Varieties : 



arguta, 1' to 3', Jy., wh. ocimoides, 1' to 3', Jy., 

 naukinensis, a popular wh. (nyn. hetero- 



garden form, referred morphu). 



to various other forms crispa, dark pur. 



by different botanical rosea, variegated witli 



authorities. pk., red, wh., and pale 



grn. 



PERILOMIA. 



Sub-scandent, leafy shrubs (ord. Labiata:) from 

 South America. Propagation, by cuttings of the 

 young shoots in sand, in a greenhouse. Soil, sandy 

 peat. Firm potting. 



Principal Species : 



scutellarioides, 3', Aug., hlf-hdy. ev. shr., sc. 

 (syn. ocimoides). 



PERIPLOCA. 



Shrubs (ord. Asclepiadese), principally hardy 

 and of 'twining habit. Grieca is the best, and is 

 appreciated for the rapidity with which it covers 

 trellises, walls, or arbours. Propagated by cut- 

 tings, under a hand-light or bell-glass in summer 

 or autumn, or by layers. Common soil. Campe- 

 lepis is now included with Periploca. 



Principal Species : 



grseca, Jy., hdy. cl., br., grn. (syn. maculata). 



PERISTERIA. (FLOWER OF THE HOLY 

 SPIRIT. DOVE FLOWER.) 



A small genus of handsome Orchids (ord. 

 Orchidacesc) with stout, fleshy pseudo-bulbs and 

 broad leaves. The flowers are large, very fleshy 

 and fragrant. Propagation, by division and by 

 imported pieces. Soil, fibrous loam and peat or 

 leaf mould, in equal parts, with sand. Plenty of 

 water is needed whilst growth is in progress. 

 Water should only be applied sparingly when the 

 plants are at rest. Although commonly grown in 

 the stove, Peristerias may be well served in an 

 intermediate house, but they must have plenty of 

 light. 



Periphragmos (see Cantua). 



Principal Species : 



[NOTE. s. =r sepals, 

 ceriua,bulbs 3"high,sum., 



yel.; Juniper scented, 

 elata, bulbs 6" high, Ivs. 

 2' to 3-V long, sum., 

 wh., 1. spotted pur., 

 fragrant, 3" across. 

 Dove Orchid. 

 Liudeuii, Feb., s. and p. 



p. = petals, 1. = lip. 



grii., pur., 1. spotted 

 blackish pur. on a light 

 ground. 



pendula, bulbs 4" to 6" 

 high, Ivs. ll>" to l.V 

 long, scapes pendent, 

 aut., yel., wh., dotted 

 pur., fragrant (*.'/" 

 maculata). 



Other Species and Varieties : 

 aspersa., bulbs 3" to 5" Humboldtii (,y Aciiicta 



high, sum. and various, Humboldtii). 



s. aud p. yel., br., and Iseta. yel., resembles 



pur. red, 1. darker. cerma. 



Barkeri (' Aciueta longiscapa (sec Lacama- 



Barkeri). bicolor). 



Ephippium, close to pen- maculata (see pendula). 



dula. rossiana, close to pendula. 



guttata, 6", yel., red; selligera, rather deeper 



curious. yel. than peudula. 



stapelioides (now Zygo- 

 petalum stapelioidesj. 



PERISTROPHE. 



One species, speciosa (ord. Acanthacese), is fairly 

 common. This handsome plant is an easily grown, 

 free-flowering, and showy, warm greenhouse, 

 winter-flowering subject. Propagation, by cuttings 

 rooted in heat in spring. Soil, two parts loam, 

 one part old Mushroom bed manure, and one part 

 leaf mould, with sand. 



Principal Species : 



speciosa, 1' to 3', win. and early spr., st. or warm 

 grh., car. pur. (syn. Justicia speciosa). A most 

 desirable plant. 



Other Species : 



lanceolaria, 1' to 3', win., pale pur., wh. 



PERNETTYA. 



Desirable hardy or half-hardy evergreen shrubs 

 (ord. Ericacefe), with small flowers succeeded by 

 prettily coloured berries. The most ornamental 

 species is mucronata, of which there are many 

 seedling forms, with berries ranging from white to 

 nearly black. The Pernettyas make useful pot 

 plants. Propagation, by seeds in spring and by 

 layers. Moist peat and loam form a suitable soil. 



Principal Species and Varieties : 

 ciliaris, !i', Je., hdy., wh. macrocarpa, nigra 



floribunda, hdy., wh., major, sanguiuea, and 



berries crim., probably speciosa are very pretty 



a form of mucronata. (.M/.s.angustifolia,Cum- 



furens, Mch., hlf-hdy., mingii Drummoudii, 



wh. (correctly Arbutus ovalifolia, speciosa, and 



furiens). Arbutus mucronata). 



mucrouata. 6', My., hdy., phillyreiefolia, 1', hlf- 

 wh. ; ma,ny vars., coc- hdy., wh. (situ. Arbutus 



ciuea, carnea, lilacina, phillyrea_>folia). 



PERONEA. 



A genus of mischievous insects. Comarinna 

 (syns. comparana, proteana, and potentillana) does 

 damage to Strawberries. Its popular name is 

 Strawberry-Leaf Button Moth. The moth, which 

 appears towards the end of June, is " in spread 

 of the forewings, which are ochreous, with- a dark 

 brown, triangular blotch. Probably there is an 

 autumn brood as well. The larvse eat the flowers 

 and leaves. Year old plants are never attacked, 



Peritoma (see Cleome). 

 Perinnnlilu (see Vinca). 

 Peronia (see 'Utalia). 



