PIPEWORT 



675 



PISTIA 



To ascertain by the above table the quantity of pipe 

 which will heat 1000 cubic feet of air per minute, 

 find, in the first column, the temperature corresponding 

 to that of the external air, and in one of the other columns 

 find the temperature of the room ; then, in this latter 

 column, and on the line which corresponds with the 

 external temperature, the required number of feet of 

 pipe will be found. 



PIPEWORT. Eriocau'lon. 



PIPING, a mode of propasating the Carnation, Picotee, 

 and Pink, is only another word for a cutting. Some 

 persons pull off the pipings from the plant, and stick 

 them in without more ado, but this is a slovenly way ; 

 besides, in pulling off the pipings, the main stem of the 

 plant is materially injured, and often destroyed. The 

 more correct way is, with a sharp knife, to cut off the 

 side-shoot close to the stem, without injuring it, leaving 

 a sufficient number of shoots to preserve the health of the 

 plant. Take off one kind at once, making the proper 

 number or tally at the same time ; then dress the pipings 

 by cutting off' the lower leaves, leaving about four at 

 the top. These four leaves should not be mutilated or 

 shortened, as they are the organs to send down sap to 

 form the roots. Put the pipings in pots filled with 

 light earth, and a covering of sand upon it. Place them 

 in a frame with a little bottom-heat, watering gently 

 when dry, and shading from the sun until they are 

 rooted. See CARNATION. 



PIPTADE'NIA. (From pipto, to fall, and aden, a gland ; 



the glands of the anthers fall. Nat. ord. Leguminosae.) 



Stove shrubs. Seeds ; cuttings in sand, in a close 



case, with bottom-heat. Fibrous loam, leaf-mould or 



peat, with a little sand. 



P. chry so' stocky s (golden-spiked). Madagascar. 

 fa-'tida (fetid). 20. Pink. Mexico. 1816. 

 guiane'nsis (Guiana). See STRYPHNODENDROK 



GUIANENSE. 



latifo'lia (broad-leaved). 4. Brazil. 1820. 



,, macroca'rpa (large-fruited). 10. Brazil. 1820. 



peregri'na (foreign). 10. Brazil. 1826. 



PIPTA'NTHTJS. (From pipto, to fall, and anthos, a 

 flower; short duration of the flowers. Nat. ord. Legumin- 

 ous Plants [Leguminosae]. Linn. lo-Decandria, i-Mono- 

 gynia. Allied to Anagyris.) 



Hardy deciduous shrub. Seeds, which ripen freely; 

 cuttings of ripe shoots under a hand-light ; layers ; cut- 

 tings, also, of roots ; rich, sandy loam ; should have the 

 protection of a wall in exposed, cold places, far north 

 of London. 



P. nepale'nsis (Nepaulese). 10. Yellow. May. Tempe- 

 rate Himalaya. 1821. " Himalayan Laburnum." 

 ,, ,, au'reus (golden). Bright yellow. 1879. 

 tomento'sus (felted). Yellow. Plant with silky felt. 

 Yunnan, China. 1887. 



PIPTO'SPATHA. (From pipto, to fall, and spathe, a 

 spathe or sheath ; the upper part or blade of the spathe 

 falls away like a cap, after a time. Nat. ord. Araceae.) 

 A dwarf, tufted perennial herb for the stove. Seeds ; 

 divisions in spring. Fibrous loam, lumpy peat, leaf- 

 mould not too much decayed, and sand, with a warm, 

 moist atmosphere when growing. 

 P. insi'gnis (remarkable). . Spathe white, with rosy 



apex. N. Borneo. i8~79. 



Ridle'yi (Ridley's). \. Spathe green, with pink lines 

 and dots. Leaves mottled with yellow. Malaya. 



PIPTU'RUS. (From pipto, to fall, and aura, a tail ; 



the long stigma is deciduous. Nat. ord. Urticaceae.) 



A stove tree, with ornamental foliage. Cuttings of 

 half-mature shoots in sand, in a close case, with bottom- 

 heat. Fibrous loam, peat, and sand. 

 P. arge'nteus (silvery). Green. Leaves with silvery 

 markings above, white beneath. Malaya, Pacific 

 Islands, Australia. 1904. 



PIQUE'RIA. (Named after A. Piqueria, a Spanish 

 botanist. Nat. ord. Composites [Composite]. Linn. 

 ig-Synenesia, i-JEqualis.) 



Hardy herbaceous perennial. Seeds, but chiefly 

 division in spring ; common soil. 



P. latifo'lia (broad-leaved). See AGERATUM CONYZOIDES. 

 trine 1 r-via. (three-nerved). 2. White. July. Mexico. 

 1798. 



PIRIQUE'TA. (Apparently a native name. Nat. ord. 

 Turneracea?. They are included under Turnera by the 

 Genera Plantarum, but not in the Index Keu-ensis.) 



Stove shrubs or subshrubs. Cuttings in sand, in a 

 propagating case. Fibrous loam, leaf-mould, and sand. 

 P. betoniccefo'lia (Betonica-leaved). See P. VILLOSA. 

 cistoi'des (Cistus-like) of Linnaeus. See P. VILLOSA. 

 ,, fu'lva (tawny). Tawny or dusky yellow. N. Amer. 

 racemo'sa (racemed). 2. July. Yellow. Brazil. 



1789. 



villo'sa (shaggy). J. July. Yellow. Guiana. 1774. 

 PIRONNEA'VA. See 



PISCI'DIA. Jamaica Dogwood. (From piscis, a fish, 

 and c<zdo, to kill ; the leaves, twigs, and bark are used 

 to stupefy fish. Nat. ord. Leguminous Plants [Legumi- 

 nosae]. Linn. \6-Monadelphia, 6-Decandria. Allied to 

 Andira.) 



Stove evergreen, white-flowered trees. Cuttings of 

 half-ripened shoots in sand, under a glass, in heat ; 

 sandy, fibrous loam. Winter temp., 48 to 60 ; summer, 

 60' to 85. 

 P. carthagine'nsis (Carthagena). See P. ERYTHRINA. 



,, Erythri'na (red). 25. Trop. Amer. 1690. 



,, longifo'lia (long-leaved). 20-30. Mexico. 



,, toxica'ria (poisonous). See P. ERYTHRINA. 



PISO'NIA. (Commemorative of Willem Piso, a Dutch 

 physician at Amsterdam. Nat. ord. Nyctaginaceae.) 



Stove or greenhouse shrubs. Cuttings in sand, with 

 bottom-heat for the stove species, and a bell-glass for 

 the greenhouse ones. Fibrous loam, peat, and sand. 

 P. aculea'ta (prickly). 6-10. Green. March. Tropics 



everywhere. 1806. " W. Indian Cockspur." 

 brunonia'na (Brownian). 40-48. Green. Tahiti and 



Marquesas Islands. 1907. 

 gra'ndis (grand). 6-10. Green. Australia and 



Pacific Islands. 1806. Greenhouse. 

 ine'rmis (unarmed). 8-10. Green. March. Trop. 



Amer. 



obtusa' ta (blunt). 3-4. Green. April. W. Ind. 1824. 

 PISTA'CIA. Pistachia-tree. (Altered from its Arabic 

 name, Foustag. Nat. ord. Terebinths [Anacardiacea?]. 

 Linn. 22-Diacia, $-Pentandria. Allied to Schinus.) 



P. atla'ntica and Lenti'scus yield the useful resin called 

 mastich. Seed nuts ; layers and cuttings ; rich, deep, 

 sandy loam. Those from Barbary and the South of 

 Europe require the protection of a greenhouse or a cold 

 pit in winter ; and even the hardiest kinds, though they 

 have stood out at Fulham and the Horticultural Society's 

 Gardens, will generally do best against a wall, when 

 north of London, unless the place is both sheltered from 

 the cold and exposed to the sun. 



EVERGREEN TREES. 



P. Lenti'scus (Lentiscus). 15. May. S. Europe. 1654. 



" Masticb-tree." 

 angustifo'lia (narrow-leaved). 10. May. S. 



Europe. 1667. 

 Chi' a (Chian). May. Scio. 



DECIDUOUS TREES. 



P. america'na (American). W. Ind. This is probably 



Simaruba glauca. 



atla'ntica (Atlantic). 12. Barbary. 1790. 

 chine' nsis (Chinese). 80. Fruits red, changing to 



blue. Central China. 1910. 

 ,, tnu'tica (beardless). Eastern Mediterranean region. 



1844. 

 ,, Terebi'nthus (turpentine- tree) . 20. June. S.Europe. 



1656. 



,, sphceroca'rpa (round- fruited). May. Evergreen. 

 ,, ve'ra (true). 20. May. Syria. 1770. 

 ,, narbone'nsis (Narbonne). 20. April. Marbonne. 



1752. 

 trifo'lia (three-leafleted). 20. May. Syria. 



PI'STIA. (From pistillum, the female organ ; signify- 

 ing the appearance of the spathe inflorescence. Nat. ord. 

 Duckweeds [Pistiaceae]. Linn. 22-Dicecia, i-Monandria.) 



Beautiful stove aquatic. Seeds and divisions ; rich, 

 strong loam ; a tub or tank in the plant-stove or 

 aquarium. 



