RIGIDELLA 



748 



ROBINIA 



The most effectual mode of ridging is thus described 

 by Mr. Parkins : 



Let us consider that a section of the ground is to be 

 trenched 2 feet deep. In the first place the ground is 

 measured out in longitudinal beds 4 feet wide ; this 

 done, the top spit of the fifth bed is laid on the first bed, and 

 the second spit of the fifth bed is laid on the third. The first 

 or top spit of the fourth bed is then laid on the third, so that 

 the top soil and subsoil are kept on separate and alternate 

 beds.and may be mixed, reversed, or returned as taken out, 

 at the will of the operator. By this method the advan- 

 tages are much greater exposure of surface to the action 

 of the weather ; the opportunity of incorporating with 

 the soil any desirable or obtainable manures, and at 

 any desired depth ; a thorough blending of the soil 

 to the depth of 2 or 3 feet ; and it also facilitates the 

 operation of draining where necessary. It is needless 

 to add, that when the first thrown-out beds are sufficiently 

 pulverised, they are levelled down, and others thrown 

 out in the same manner ; the ridges are thrown out and 

 left as rough as possible. 



RIGIDE'LLA. (From rigidus, stiff; the stiffness of 

 the flower-stalk. Nat. ord. Irids [Iridacere]. Linn. 3- 

 Triandria, i-Monogynia. Allied to Tigridia.) 



Half-hardy bulbs'. Offsets in spring ; also by seeds 



in a hotbed ; rich, sandy loam and peat ; bulbs require 



to be kept from frost and damp during the winter. 



R. fta'mmea (flame-coloured). 5. May. Mexico. 1839. 



immacula'ta (unspotted). i. Crimson. June. 



Guatemala. 1839. 

 ortha'ntha (straight-flowered). i. Crimson. June. 



Mexico. 1846. 



RI'NDERA. (Possibly a commemorative name. Nat. 

 ord. Boraginacess. Allied to Cynoglossum.) 



Hardy perennial herbs. Seeds ; divisions. Ordinary soil. 

 R. lana'ta (woolly). Asia Minor; Persia. 

 umbella'ta (limbelled). 1-2. Reddish-yellow or 

 brown. Hungary ; Servia. 1907. 



RINGING is cutting away a belt of bark quite down to 

 the wood entirely round a branch. This checks the 

 return of the sap, and aids to make that branch more 

 fruitful, and the fruit on it finer. We have seen it done 

 with the best effect upon the pear and grape-vine. It 

 should be done just previously to the blossoms opening. 

 When first suggested it was called the Ring of Pomona. 

 See LIGATURES. 



RIOCREU'XIA. (Commemorative of A. Rincreux, a 

 botanical artist. Nat. ord. Asclepiadaceas. Allied to 

 Ceropegia.) 



Warm greenhouse climber. Cuttings in sand, with 

 gentle bottom-heat, in spring. Fibrous loam, a little 

 leaf-mould, some finely broken bricks, and sand. 

 R. torulo'sa (knotted). Pale yellow. S. Africa. 1862. 



RIPENING WOOD is one of the principal objects to be 

 aimed at for the production of either flowers or fruit the 

 following year. To effect this, at the end of August, 

 or early in September, superfluous branches should be 

 removed, and shoots stopped, to concentrate the sap, 

 and expose those retained to the full infl uence of the sun. 



RIPO'GONUM. See RHIPOGONUM. 



RITCHIE'A. (Commemorative of Joseph Ritchie, an 

 African traveller. Nat. ord. Capparidaceae.) 



Stove evergreen shrubs. Cuttings in sand, in a close 

 case, with bottom-heat. Fibrous loam, a little leaf- 

 mould, and well-decayed cow-manure, and sand. 

 R. fra' grans (fragrant). 10-15. Creamy-white. June. 



Trop. Africa. 1795. 



polyps tola (many-petaled). 10. White. Trop. 

 Africa. 1862. 



RI'VEA. (Named after A. de la Rive, a Genevan 

 botanist. Nat. ord. Bindweeds [Convolvulaceae], Linn. 

 5-Pentandria, i-Monogynia. Allied to Ipomoea.) 



Stove evergreen twiner. Cuttings of side-shoots, and 

 of the young shoots, several inches in length, as they 

 rise from the roots in spring ; or grafting on a free-grow- 

 ing Ipomoea ; fibrous loam and rough, sandy peat. 

 Winter temp., 55 to 60 ; summer, 60 to 85. 

 R. hypocraterifo'rmis (salver-shaped). 20-30. White. 



E. Ind. 1799. 



tilicefo'lia (lime- leaved). See ARGYREIA TILLEFOLIA. 

 zeyla'nica (Cingalese). See ARGYREIA POPULIFOLIA. 



RIVI'NA. (Named after A. Q. Rivinus, a German 

 botanist. Nat. oid. Phytolaccads [Phytolaccaceas]. Linn. 

 4-Tetrandria, i-Monogynia.) 



Called rouge plants in the West Indies, where the fruit 

 is used as a cosmetic. Stove evergreens. Seeds and 

 | cuttings. The flowers are of little beauty ; but the 

 i racemes of ripe and ripening fruit are very interesting ; 

 light soil. Winter temp., 50 to 60 ; summer, 60 to 80. 

 i R. auranti'aca (orange). 2. Green. Berries orange- 

 yellow. S. Amer. 

 i ,, brasilie'nsis (Brazilian). See R. HUMILIS. 



hu'milis (lowly). 2. White. June. W. Ind. 1699. 

 cane'scens (hoary). 2. White. June. W. Ind. 



1804. 



,, la'vis (smooth). 2. Pink. May. W. Ind. 1733. 

 lanceola'ta (spear- head-leaved). See R. HUMILIS. 

 latifo'lia (broad-leaved). See MOHLANA LATIFOLIA. 

 octa'ndra (eight-stamened). See VILLAMILLA oo 



TANDRA. 



,, purpura' scens (purplish). See R. HUMILIS. 



tincto'ria (dyeing). 4. White. May. Caracas. 1830. 



ROAN-TREE. Py'rus Aucupa'ria. 



ROBE'RGIA FRUTE'SCENS. See ROUREA FRUTES- 



CENS. 



ROBERTSO'NIA. See SAXIFRAGA. 



ROBI'NIA. (Named after /. Robin, a French botanist. 

 Nat. ord. Leguminous Plants [LeguminosEe]. Linn. 17- 

 Diadelphia, 4-Decandria. Cobbett's Locust-tree is Ro- 

 bi'nia Pseu'daca'cia.) 



Deciduous, white-flowered trees, from North America, 



j where not otherwise stated. For tender kinds, cuttings 



of young wood in sand, under a glass. The Locust-free, in 



all its varieties, by seed sown in autumn, or preserved in 



the pods, and sown in the spring ; by cuttings of the 



shoots ; by cuttings of the roots ; by suckers and layers. 



The finer varieties are generally grafted. The hi'spida, 



or Rose Acacia, is a fine object grafted on the Pseu'd- 



aca'cia standard high, in a sheltered place not much 



north of London. The finer varieties of hi'spida, in cold 



situations, deserve a place on a conservatory wall, and 



would be a nice companion to the Wistaria chine' nsis, &c. 



j R. Altaga'na (Altagana). See CARAGANA MICROPHYLLA. 



cape'nsis (Cape). See CALPURNIA ROBINIOIDES. 



Caraga'na (Caragana) . See CARAGANA ARBORESCENS. 



cocci' 'nea (scarlet). See ORMOSIA COCCINEA. 



,, colorade'nsis (Colorado). 10-20. Rose-white or rose, 



fragrant. Colorado. 1908. 



davu'rica (Dahurian). 30. May. Dahuria. 1820. 

 du'bia (doubtful). 30. White, red. May. 

 ,, frute'scens (shrubby). See CARAGANA FRUTESCENS. 

 ,, grandiflo'ra (large-flowered). See CARAGANA GRANDI- 



FLORA. 



,, guinee'nsis (Guinea). 6. Guinea. 1822. Stove ever- 

 green. 

 Halode'ndrum (Halodendrum). See HALIMODENDRON 



ARGENTEUM. 



hi'spida (bristly). 10. Pink. July. 1743. " Rose 



Acacia." 



macrophy'lla (large-leafleted) . 10. Red. May. 

 na'na (dwarf), i. Pink. June. Carolina. 

 ro'sea (upright. Rose). 10. Red. July. 

 ine'rmis (unarmed). See ROBINIA PSEUDACACIA 



INERMIS. 



juba'ta (maned). See CARAGANA JUBATA. 



Kelse'yi (Kelsey's). 3-10. Rose. June. N. Amer. 



1908. 

 ,, macrophy'lla (large-leaved). See R. HISPIDA MACRO- 



PHYLLA. 



,, mo'llis (soft). See CARAGANA FRUTESCENS. 



,, monstro'sa (monstrous). See R. PSEUDACACIA MON- 



STROSA. 

 neomexica'na (New-Mexican). 6-15. Red. Rocky 



Mountains. 1891. 

 luxu'rians (luxuriant). 15-20. Red. Racemes 



compound. Rocky Mountains. 1892. 

 pe'ndula (drooping). See ROBINIA PSEUDACACIA 



PENDULA. 



,, pro'cera (tall). See ROBINIA PSEUDACACIA PROCERA. 

 ,, Pseu'daca'cia (common. Bastard Acacia). 40. May. 



1640. " Locust," " Acacia." 

 amorphcsfo' lia (Amorpha-leaved). 3. White, red. 



May. 

 angustifo'lia (narrow-leaved). Leaflets very 



narrow. 1889. 



