ROD 



[ 699 ] 



ROO 



It. planifo'lia (flat-leaved). 



recu'rva (curled-back). f Yellow. June. 1824. 



aecu'nda (side-flowering). . Red. July. Trini- 



dad. 1820. 



stenochi'la (narrow-lipped). Yellow, red. July. 



Venezuela. 



suave'olens (sweet-scented). Yellow. Fe- 



bruary. 1825. 



ROEBUCK BEERY. JRn'bttsctiitmamo'rits. 



ROE'LLA. (Named after C . Roelle, a 

 Dutch botanist. Nat. ord. Bcllworts 

 [Campanulaceae]. Linn., 5 . y entandriu 

 1 Monogynia.) 



Greenhouse plants, and all but ne from the 

 Cape of Good Hope. Decu'rrens from seed in a 

 gentle hotbed, in spring, planted out in early 

 summer ; musco'sa by division ; the rest, being 

 evergreen shrubs, by cuttings of the points of the 

 shoots in sand, under a bell-glass; sandy peat 

 and fibry loam. Winter temp., 40 to 48. 

 JR, cilia' ta (hair-fringed). 1. White, purple. July. 

 1774. 



dectt'rrens (decurrent). 1. Blue. August. 1/8/. 



Annual. 



e'lcr.- < (elegant), f . Purple. February. 1836. 

 frui ia'sa (small-shrubby). Yellow. July. 



N. Holland. 1820. 



musco'sa (mossy). . Blue. August. 1802. 



Herbaceous. 



peduncula'ta (long- flower -stalked). Blue. 



June. 1827. 



squarro'sa (spreading). J. White. July. 1787. 

 Be'rgii (Berg's). Blue. August. 18l6. 



spica'ta (spiked). White. August. 1821. 



ROLLER. This is best made of cast- 

 iron, and may be had of four different 

 sizes, viz., with a diameter of sixteen, 

 eighteen, twenty -two, or twenty, four 

 inches. The roller is best used the day 

 after a fall of rain. 



ROME'RIA. Named after J, Y. Homer, 

 a German botanist. Nat. orcl., Poppyworts 

 [Papaveracese]. Linn., 13-Polyandrial- 

 Monogynia. Allied to Glaucium.) 



Hardy annuals. Seeds in the open border, ia 

 March or April. 

 R. hy'brida (hybrid). 2. Purple. May. Britain. 



refra'cta (refracted). 1. Violet. June. Tauria. 



1823. 



vermicula'ta (worm-like). Red. June. Persia. 



1S29. 



ROND: :'TIA. (Named after ' W. 

 Rondelet, a Frenchman. Nat. ord., 

 Cinchpnads [Cinchonacese]. Linn., 5- 

 Pentandria I-Monogynia.) 



Stove evergreen shrubs. Cuttings of the points 

 of the shoots, getting slightly firm, in sand, under 

 a bell-glass, and in bottom-heat; the glass being 

 raised at night, and in dull weather, to prevent 

 damping ; fibry peat and fibry loam, with enough 

 of sand, broken pots, and charcoal to insure 

 openness in the soil. Winter temp., 48 to 55; 

 summer, 60 to 85. 



R. America'na (American). 10. White. August. 

 W. Ind. 1752. 



di'scolor (two-coloured). 6. Red. New Gre- 



nada. 



hirsu'ta (hairy). 5. Yellow, July. Jamaica 1820. 



R. hi'rta (hairy). 10. Pink. July. Jamaica. 1776. 



laevigctta, (smooth-/eai>). 12. White. July. 



W. Ind. 1790. 



laurifo'lia (laurel-leaved). 5. White. July. 



Jamaica. 1824. 



longiflo'ra (long- flowered). Blue. August. 



Brazil. 1842. 



odora'ta (scented). 3. Red. July. W.Ind. 1836. 



panicula'taip&mcled). 6. White. July 



E. 

 Ja- 



Ind. 1820. 



rocemo'sa(racemed). 6. White. July. 



maica. 1820. 



specio'sa (showy). 1. Scarlet. April. Ha- 



vannah. 1830. 



-- ma'jor (large-lowered). 3. Scarlet. April. 

 Ha van nab.- 



thyrsoi'dea (thyrsed). 5. White. July. Ja- 



maica. 18ig. 



tomento'sa (downy). 6. White. July. Ja- 



maica. 1819. 



versi'color (changeable-coloured). 4. Pink. 



March, yeraguas. 1838. 



ROOTS are either annual, biennial, or 

 perennial; but in all roots, and under 

 any mode of management, the fibrous 

 parts (radiculse) are strictly annual; they 

 decay as winter approaches, and are pro- 

 duced with the returning vigour of their 

 parent in the spring. Hence the reason 

 that plants are transplanted with most 

 success during the season of their de- 

 cay; for, as the root almost exclusively 

 imbibes nourishment by the mouths of 

 these fibres, in proportion as they are 

 injured by the removal so is the plant 

 deprived of the means of support : that 

 sap which is employed in the formation 

 of new fibres would have served to in- 

 crease the size of other parts. 



Roots always travel in the direction 

 where most food is to be obtained ; there- 

 fore, for carrots and parsnips, let a little 

 manure be turned in with the bottom spit 

 when the ground is trenched for them. 

 So, if it be desirable to prevent the roots 

 of any plant travelling in a certain direc- 

 tion, the soil on that side should be 

 excavated, and the cavity refilled with 

 sand, or some other unfertile earth, whilst 

 the soil on those sides of the plant whither 

 the roots are desired to tend should bo 

 made as fertile as is permissible with its 

 habits. 



Whatever causes an excessive develop- 

 ment of root prevents the production of 

 seed; and vice versd, the production of 

 seed, especially in tuberous-rooted plants, 

 reduces the amount of root developed. 

 Thus, frequent transplanting the young 

 plants of tbe lettuce, brocoli, and cauli- 

 flower causes the production of numerous 

 fibrous roots, and is found effective in 

 preventing tbe mature plants advancing 

 early to seed. 



