PERIPLOCA 



the anthers connected at the apex and Tillous; style 

 shoit, with broad stigma: (r. consisting of 2 follicles, 

 containing numerous, small, winged seeds. 



Graeca, Linn. Silk Vine. Deciduous shrub, twining 

 to 40 ft. : Ivs. petioled, ovate to oblong-lanceolate, 

 acuminate, dark green and glossy above, 2-t in. long: 

 fls. in loose, long-peduncled cymes, brownish purple 

 inside, greenish at the margin and outside, %-l in. 

 across; petals oblong, villous; crown with 5 slender 

 thread-like incurved glabrous appendages : follicles 

 narrow, about 4 in. long. July, Aug. S. Eu., W. Asia. 

 B.M. 2289. B.R. 10:803. L.B.C. 14:1389. Gn. 34, p. 78. 

 — Under the name of P. angustifolla a narrow-leaved 

 form is sometimes cultivated, but it is P. Graca, var. 

 angustifolia, Jiig. The true P. angustifolia, Labill., is 

 synonymous to P. lavigata, Ait., from the Canary Isl. 

 and N. Africa, with persistent Ivs. and pubescent ap- 

 pendages of the crown. Alfred Rehdfe. 



PERIST£;RIA (Greek, dove, from the form of the 

 column and wings). OrchidAcece. A genus of stately 

 South American orchids, having large plicate leaves 

 unfolding successively, and tall, erect or hanging 

 flower-spikes. The flowers are nearly globose or cup- 

 shaped, of a waxy texture, with broad, concave seg- 

 ments. The genus is distinguished from the related 

 genera Acineta, Sacsena, Gongora, etc., by the curious 

 shape of the labellum and column. The base of the 

 labellum (hvpochil) is united with the column by broad 

 wings (pleiiridia). The upper part of tlie labellum 

 (epichil) is movably joined to the hypochil. Five 

 species, of which two are commonly cultivated. 



These plants are easily kept alive, but difficult to 

 flower. When growth begins thc-y sliimld lie iilanted in 

 well-drained coni[..ist ..f lilin.n-^ li.:iiii, l.^af in.ilil and 

 sand, and carefully \v;i.ir..l until ili'' pljiii~ li.-i-diiie 

 vigorous. Later liipinl iiKinurr .u- iM,rMiiu-i ni;iy lie 



spikes. Liberal treatment will produce line sj'eciitiens, 

 but poorly fed plants often fail to flower at all. When 

 resting, they should be removed from the tropical 

 house to a cooler room. P. elata is often grown as a 

 purely terrestrial orchid. 



elita. Hook. Dove Flower. Holy Ghost Flower. 

 Fig. 1722. Pseudobulbs 4-5 in. high, bearing several 

 strongly veined Ivs. 2-3 ft. high: fl.-stem 3-4 ft. high; 

 fls. in a raceme covering about one-tliird the leneth of 

 the flower-stalk, cup-shaped, creamy while, wax-like and 

 fragrant, 2 in. across; sepals bn.aclly "V-ite to rotund; 

 petals more delicate; labellum fleshy, lucailly ohovate, 

 truncate, sprinkled with deep purple; eoluniii with large, 

 curious wings, supposed to bear resemblance to a dove, 

 June-Sept. Panama. B.M. 3116. Gng. 5:151. V. 8:163. 

 Gn. 12, p. 153; 30, p. 574; 42, p. 324. R.H. 1876; p. 133; 

 1877:110 —The labellum and wings of the column are 

 sometimes spotted with purple. 



p^ndula, Hook. Pseudobulbs ovate-oblong, 4-5 in. 

 high, bearing lanceolate, strongly veined Ivs.: scape 

 pendulous, from the base of the pseudobulb, bearing as 

 many as 20 fls.: fls. fflol.ular in outline, Vi in. across, 

 fragrant, greenish white out-ide, tin-..! with rose and 

 thickly dotted with j.uriile wiiliiu; sepals roundish con- 

 cave, united at l.asi ; ]Htals laihiT smaller; labellum 



Guiana. B.M. 347',t. 



treatment, but rarel 



P. Humboldtii, Lin.l 



•itliin the flower. 

 -Requires tropical 



PERfSTBOPHE (Greek, peri, around, and strophes, 

 belt; alluding to the involucre). Acanth&cem. Erect 

 branched or loosely creeping herbs or half-shrubby 

 greenhouse plants cult, for their flowers. Lvs. entire: 

 fls. solitary or in elusters .,f 'J-ll surrounded by an 

 involucre, in loose eyiies or e\ inose panicles, or distant 

 on slender brauehes; luaets of the involucre narrow; 

 calyx deeply 5-pai-ted, shorter than the bracts, scariose 

 or hyaline; corolla-tube long, slender, slightly enlarged 

 above, limb deeply bilabiate, the posterior lip narrow, 

 erect, concave, entire or eraarginate, lower lip spread- 

 ing, apex 3-parted; stamens 2, a little shorter than the 

 corolla lips; anthers 2-celled; sterile 



PERNETTYA 1279 



style filiform: capsule oblong, contracted into a solid 

 stalk. About 15 species, ranging from tropical Africa 

 through the Malay Islands and Australia to India. 



The plants are cult, like Jacobinias or Justicias, of 

 the same family. Cuttings taken at any time when the 

 wood is soft will root in a warm bed in 3—1 weeks, after 

 which the potted plants may be removed to a house of 

 lower temperature. They require a rich loam mixed 

 with some leaf-mold, and plenty of air. 



1723. Peristrophe speciosa (X K). 



specibsa, Nees (Justicia speciosa, Roxb.). Fig. 1723. 

 Plants erect, spreading and branched, becoming 2-3 ft. 

 high: lvs. opposite, petioled, ovate-acuminate, smooth: 

 fls. in clusters of 2-3 on slender branches, violet-purple, 

 1% in. long. Fls. for a long period in winter. India. 

 B.M. 2722. L.B.C. 20:1915. B. 2:74.-A pot-plant of 

 bushy, compact habit when well grown. Good for the 

 window. Usually thrives best in partial shade. 



angustUdlia, Nees. Plants low, erect, very much 

 branched: branches nearly hori/outul, pubescent above: 

 lvs. lanceolate, pointed at I...1I1 ends: fls. sparse, in ter- 

 minal cymes, rose-colored. ll..«eis freely. Java.-A 

 var. ailrea variegita has th, eenirr of the lvs. varie- 

 gated with yellow. Useliij lor vases and baskets. 



Heinrich Hasselbeing. 



PERIWINKLE. Vi,,ea. 



PERNETTYA (after A. J. Pernetty (1716-1801); he 

 accompanies Bougainville on his voyage and wrote "A 

 Voyage to the Falkland Islands"). Ericilceie. Ornamen- 

 tal low evergreen shrubs, with small, alternate, usually 

 serrate lvs. and small, while or jiiiikish, nodding fls., 

 usually solila]-;, in the a.il- aid followed by very deco- 

 rative berii' - .0 I I I II white to purplish 

 black or blin I i 1 i;; on the branches 



all winter. 'In.. : ' ' i '> shrubs are great 



favorites in Ln^ I. u 1. 1. I n-'ivn in this e.^.ijn- 



try. P. mucrotiala -.n:. /• ^ . •' 1I1. Imr.iie.t .-.re 



probably hardy in si ; ■ i" I: .s 



New York. They af ■ :i r . i r- 



ders of evergreen shrnl.K. m - mh.I al-.. mak.. \ . r\ lian.l- 

 some pot-plants. They grow best in a peaty and porous 

 moderately moist soil and prefer sunny positions, but 

 seem to grow almost as well in any other well-drained 

 soil; in shade they will not fruit as profusely as in the 

 full sun. Prop, by seeds or by cuttings of half-ripened 



