OIL NUT 



600 



OLEARIA 



mors-uva, the American gooseberry mildew ; and S. 

 castagnei, the hop mildew. 



All are easily recognised, and as they are very de- 

 structive prompt measures should be taken to prevent 

 them from spreading. Flowers of sulphur will destroy 

 all these fungi, if dusted on the affected parts, and this 

 should be done with vines before the mildew gets upon the 

 berries. Sulphide of potassium, at the rate of one ounce 

 to three gallons of water, sprayed on affected plants, is 

 a very effective cure, and will act as a preventive, used 

 before mildew appears. 



OIL NUT. Ri'cinus commu'nis. 



OIL PALM. Elce'is guinee'nsis. 



LAX. (From olax, furrowed ; flowers partially fur- 

 rowed, or imbricated. Nat. ord. Olacinacea?. Linn. 

 3-Triandria, i-Monogynia.) 



Stove, white-flowered, evergreen climbers, from the 

 East Indies. Cuttings of ripened shoots in sand, under 

 a bell-glass, in heat ; sandy peat, fibrous loam, and a 

 little dried leaf-mould. Winter temp., 50 to 55 ; 

 summer, 60 to 80. 



O. imbrica'ta (imbricated). 8. December. 1820. 

 sca'ndens (climbing). 8. December. 1820. 

 stri'cia (upright). 4. White. Australia. 1820. 



OLDENBURGIA. (A commemorative name. Nat. 

 ord. Compositae.) 



Greenhouse evergreen shrub, with a stout, unbranched 

 stem. Seeds ; cuttings of half-ripe wood in sand, under 

 a bell-glass. Fibrous loam, peat, and sand. 

 0. Arbu'scula (little- tree). 3-6. Purple and white. S. 

 Africa. 1903. 



OLDENLA'NDIA. (Named after H. B. Oldenland, a 

 Danish plant-collector. Nat. ord. Rubiads [Rubiacea?]. 

 Linn. 4-Tetrandria, i-Monogynta. Allied to Hedyotis.) 

 Cuttings of half-ripened snoots of deppia'na in April, 

 in sand, under a glass, in bottom-heat ; peat and loam. 

 Winter temp., 50 to 55 ; summer, 60 to 85. The 

 annuals sow in a gentle hotbed, in March ; prick out the 

 seedlings in the bed, and move them to the open border, 

 after gradually hardening them, at the end of May. 

 O. cape'nsis (Cape). White. July. S. Africa. 1824. 



Annual. 

 corymbo'sa (corymbed). White. June. Jamaica. 



1739. Annual. 

 deppea'na (Deppe's). i. White. June. Mexico. 



1835. Stove evergreen. 



dolicha' ntha (long-flowered), i. White, green, frag- 

 rant ; tube 4 in. long. E. Trop. Africa. 1907. 

 umbella'ta (umbelled). |. White. July. E. Ind. 

 1792. 



OLDFIELDIA. (Commemorative of R. A. Oldfield, a 

 trader at Sierra Leone. Nat. ord. Euphorbiaceae.) 



Evergreen stove tree. Seeds ; cuttings of ripe wood 

 in sand, in a close case with bottom-heat. Fibrous loam, 

 leaf-mould, and sand. 



O. africa'na (African). W. Trop. Africa. " African 

 Teak." It affords valuable timber for the ship- 

 builder. 



OLD MAN. Artemi'sia Abro'ianum and Rosmari'nus 

 officina'lis. 



OLD MAN'S BEARD. Geropo'gon, Cle'matis Vita'lba, 

 and Tilla'ndsia usneoi'des. 



OLEA. Olive. (From elaia, the olive. Nat. ord. 

 Oliveworts [Oleacea?]. Linn. 2-Diandria, i-Monogynia.) 



The Olive will graft on the Privet, Phillyrea, Ash, 

 Lilac, and others of the order. Evergreens, all white- 

 flowered, except O. fro! grans. Cuttings of ripened shoots 

 in spring, in sand, under a hand-light, in a close frame 

 or pit ; also, when procurable, by seeds and grafting ; 

 loam and peat, of an open, fibrous character. Winter 

 temp., 38 to 48. O. sati'va has stood for years against 

 south walls near London. The scent of fra'grans is 

 sufficient to perfume a large conservatory ; where only 

 one of the genus can be grown, this should be fixed upon. 



GREENHOUSE EVERGREENS. 



O. america'na (American). See OSMANTHUS AMERICANUS. 

 ape'tala (without petals). See NOTEL^EA LONGIFOLIA. 

 arbo'rea (tree). 20. August. 1825. 



O. buxifo'lia (box-leaved). See O. EUROP^A. 

 ,, cape'nsis (Cape). 5. July. S. Africa. 1730. 

 ,, ,, undula'ta (-wave-leaved). See O. LAURII-OLIA. 

 chrysophy'lla (golden-leaved). 15. July. Mascarene 



Islands ; Trop. Africa. 

 europa'a (European). 5. July. Portugal. 1821. 



" Wild Olive." 

 ,, ,, sati'va. (cultivated). August. S. Europe. 1570. 



" Olive." 



,, exce'lsa (tall). See NOTELJEA EXCELSA. 

 ,, fra'grans (fragrant). See OSMANTHUS FRAGRANS. 

 ,, ferrugi'nea (rusty-leaved). See O. CHRYSOPHYLLA. 

 ,, latifo'lia (broad-leaved). See PHILLYREA LATIFOLJA. 

 ,, laurifo'lia (laurel-leaved). 6. July. S.Africa. 1730. 

 longifo'lia (long-leaved). See O. EUROP^A. 

 cbli'qua (twisted-leaved). See O. EUROP^EA. 

 ,, Olea'ster (oleaster). See O. EUROP^A. 

 panicula'ta (panicled). 10. July. Australia. 1825. 

 ,, sati'va (cultivated). See O. EUROP/EA SATIVA. 

 ,, verruco'sa (warted). 6. April. S. Africa. 1814. 

 undula'ta (waved). See O. LAURIFOLIA. 



STOVE EVERGREENS. 



0. dioi'ca (dioecious). 30. March. E. Ind. 1818. 

 la'ncea (spear- head-leaved). 20. August. Isle of 



France. 1819. 



robu'sta (robust). See LIGUSTRUM ROBUSTUM. 

 ,, roxburghia'na (Dr. Roxburgh's). See LIGUSTRUM 



NEILGHERRENSE. 



OLEANDER. SeeNERiUM OLEANDER. 



OLEA'NDRA. (The genus is founded on neriifo'rmis, 

 or oleander-like. Nat. ord. Ferns [Filices]. Linn. 24- 

 Cryptogamia, i-Filices.) 



Stove Ferns, with yellow spores. See FERNS. 

 0. articula'ta (jointed). June. Natal. 1837. 

 Cumi'ngii (Cuming's). June. Isle of Luzon. 

 ,, neriifo'rmis (oleander-like). May. Amer. 

 nodo'sa (knotty). May. S. Amer. 1840. 

 Walli'chii (Wallich's). May. Nepaul. 



OLEA RIA. (From olea, an olive, and that from the 



Greek elaia, an olive ; in allusion to the olive-like leaves 



of some species. Nat. ord. Compositae. Allied to Aster.) 



Hardy, half-hardy, and greenhouse evergreen shrubs 



of considerable beauty. Seeds ; cuttings in sandy soil 



under hand-lights in a gentle heat. Light, well-drained 



soil. Winter temp., 35 to 50 ; summer, 50 to 65, for 



the greenhouse species. 



O. alpi'na (alpine). See O. NITIDA. 



argophy'lla (silvery-leaved). 4-10. White. March 



to May. Australia. 1804. " Musk Tree." 

 ,, chata'mica (Chatham Island). 2-4. White ; disc 



violet-purple. Chatham Island. 1907. 

 chrysophy'lla (golden-leaved). 3-10. White. Aus- 

 tralia. 

 chryso' tricha (golden-haired). 2-3. White. Australia. 



1841. 

 ,, cilia'ta (eye-lashed). 1-2. Lilac. W. Australia. 



1908. Greenhouse. 



denta'ta (toothed). 3-4. Rose. Australia. 1872. 

 ,, Forste'ri (Forster's). 3-6. White. New Zealand. 



1866. 



,, furfura'cea (scurfy). 6-10. White. New Zealand. 

 ,, glutino'sa (clammy). Pale violet. Australia. 1839. 

 ,, gummo'sa (gummy). 2-3. 1889. 

 gunnia'na (Gunnian). See O. STELLULATA. 

 ,, Haa'stii (Haast's). 2-4. White. July, August. 

 New Zealand. 1872. " New Zealand Daisy Bush." 

 Hardy. 

 insi'gnis (remarkable). 2. White. New Zealand. 



Greenhouse. 



lira'ta (lyre-formed). See O. STELLULATA LIRATA. 

 quercifo'lia (oak-leaved). See O. STELLULATA 



QUERCIFOLIA. 



lyra'ta (lyre-formed). See O. STELLULATA LIRATA. 

 tnacrodo'nta (large-toothed). 3-4. White. August. 



New Zealand. 1884. Half-hardy. 

 myrsinoi'des (Myrsine-like). 2-4. Light purple. 



May. Australia. 1835. 

 erube'scens (reddish). 2-3. Light purple-red. 



May. Australia and Tasmania. Half-hardy. 

 ni'iida (shining). 2-3. White. New Zealand. 1851. 



Half-hardy. 



