ROC 



[T83 ] 



ROO 



For the benefit of those who are not 

 accustomed to using cement, we may 

 mention that no more should he moist- 

 ened at once than can he used in a 

 short time. If the cement be good it 

 will quickly harden, and will then he 

 in a manner useless. 



In making artificial rock for water- 

 falls, or other constructions, where the 

 cement may be constantly exposed to 

 the action of the water, the best water- 

 cement should be used. Any pre- 

 paration that does not quickly indurate 

 under water, will, in a short time, be 

 washed away, and leave nothing but 

 the bare stones. Wkateley. 



RODRIGUE'ZIA. (Named after E. 

 Rodriguez, a Spanish botanist. Nat. 

 ord., Orchids [Orchidacere], Linn., 20- 

 Gytiandria I-J\fonandria.) 



Stove Brazilian orchids, cultivated in baskets. 

 See Orchids. 

 R. Ba'rkeri (Barker's). 1. Green. January. 



cri'spa (curled). Green. 



lanceola'ta (spear- head -leaved). Yellow. 



March. Trinidad. 1821. 



laxiflo'ra (loose-flowered). . Pale green. 



planifo'lia (flat-leaved). 



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



1824. 



secti'nda (side-flowering). . Red. July. 



Trinidad. 1820. 



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



July. Venezuela. 



suave' olens (sweet-scented), Yellow. Feb. 



ruary, 1825. 



ROEBUCK BEKBY. Ru'bus chamce- 



ROE'LLA. (Named after G. fioelle, 

 a Dutch botanist. Nat. ord., Bellworts 

 [CampanulaceseJ. Linn., 5-Pentandria 

 1-Monogynia.) 



Greenhouse plants, and all but one from 

 the Cape of Good Hope. Decurrens from seed 

 in a gentle hot-bed, in spring, planted out 

 in early summer ; muscosa 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. 



R. cilia't a (hair-fringed). 1. White, purple. 

 July. 1774. 



decu'rrens (decurrent). 1. Blue. August. 



1787. Annual. 



e'legans (elegant). 2. Purple. February. 



1836. 



fruticulo'sa (small-shrubby). Yellow. July. 



New Holland. 1820. 



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



Herbaceous. 



peduncula'ta (to#-flower-stalked), Blue. 



June. 1827-. 

 - squarro'ta (spreading), 4. White, July, 1787* 



R. squarro'sa Be'rgii (Berg's). Blue. August. 

 1816. 



spica'tu (spiked). White. August. 1824. 



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.Romer, 

 a German botanist. Nat. ord., Poppy- 

 worts [Papaveracese]. Linn., 13-Poly- 

 andria \-Monogynia, Allied to Glau- 

 ciurn.) 



Hardy annuals. Seeds in the open border, 

 iti March or April. 

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



refru'cta (refracted). 1. Violet. June. 



Tauria. 1823. 



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



Persia. 182Q. 



RONDELE'TIA. (Named after W. 

 Rondelet, a Frenchman. Nat. ord., 

 Cinchonads [Cinchonacese]. Linn., 5- 

 Pentandria l-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, M'ith 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, Indies. 1752. 



discolor (two-coloured), 6, Red. N. Gre- 



nada, 



Mrsu'ta (hairy). 0. Yellow, July, Jamaica, 



1820. 



hi'rta (hairy). 10, Pink. July, Jamaica. 



1776. 



leeviga'ta (smooth- Jeooed). 12, White. 



July, W.Indies, 1790, 



laurifo'lia (Laurel-leaved). 5. White, July. 



Jamaica. 1824. 



longifln'ra (long-flowered). Blue. August, 



Brazil. 1842. 



odora'ta (scented). 3, Red. July. W. 



Indies. 1836. 



panicula'ta (panicled). 6. White. July. 



E. Indies. 1820. 



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



Jamaica. 1820. 



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



vannah. 1830. 



' ma'jor (lArger-flowered) , 3. Scarlet. 



April, Havannah, 



thyrsoi'dea (thyrsed). 5. White, July. 



Jamaica. 1819* 



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



Jamaica. 1819. 



ROOTS are either annual, biennial, or 

 perennial, but in all roots, and under 

 any mode of management, the fibrous 



