Oldenbergia 



( 129 ) 



Omphalodes 



beneath a bell-glass, over bottom heat. Soil, fibrous 

 loam and sandy peat. 



Principal Species : 



imbricata, 8', win., wh. 

 scandens, 8', wiu., wh. 



stricta, 6', aut., wh. 

 (*I/H. Spermaxrrum 

 strictum). 



OLDENBERGIA. 



A small genus of shrubs (ord. Compositas). Pro- 

 pagation, by seeds. Soil, sandy peat. 



Principal Species : 

 Arbuscula, 4' to 10', sum., wh. 



OLDENLANDIA. 



Stove and greenhouse annuals and shrubs (ord. 

 Kubiaceae), of slender habit and no horticultural 

 merit. Propagation, by seeds for the annuals and 

 cuttings for the shrubs. Soil, loam and peat, both 

 fibrous, with sand. 



Principal Species : 



capensis, 6", Jy., aim., corymbosa, G", Je., ami., 

 wh. wh. 



deppiana, 1', Je., st. ev., 

 wh. 



OLDFIELDIA. 



Stove evergreen trees (ord. Euphorbiacese). Prop- 

 agation, by cuttings beneath a bell-glass, over 

 bottom heat. Soil, sandy loam. The principal 

 species is africana, and this is probably not now in 

 cultivation. It is a large tree with unattractive 

 flowers, but its timber is stronger than Oak or Teak, 

 though too heavy for general use. 



OLEA. (OLIVE.) 



A very important genus (ord. Oleacere), yielding 

 the olive oil of commerce. The species are half- 

 hardy shrubs, and produce fragrant flowers. Propa- 

 gation, by cuttings in sand, under a hand-light ; 

 seeds in a frame ; or grafting upon the common 

 Privet. Soil, peat and loam, both fibrous, with 

 coarse sand. 



Principal Species : 



capensis, G', Jy., wh. fragrans (see Osmanthus 



europ8ea,G.',Jy., wh. (//. fragraus). 



Oleaster) ; sativa is a laurifolia, 6', sum., wh. 



good var. Wild Olive. (ai/n. undulata). 



verrucosa, 6', spr., wh. 



OLEANDER (m NERIUM). 



OLEANDRA. 



Stove Ferns (ord. Filices), bearing yellow spores. 

 Propagation, by spores and division. Soil, fibrous 

 peat, loam and coarse sand. The long, creeping 

 rhizomes are best pegged over a mound of soil, as 

 by this means a fine specimen, covered with entire, 

 lanceolate fronds, is produced. 



Principal Species : 



artiriil.-it.-t, fronds, G" to 



12" long, ev. 

 ncriiformis, fronds 6" to 



IS" long. 



nodosa, fronds 6" to 12" 



long. 

 Wallii'hii, fronds 6" to 



12" Ion;;. 



Old Jltfiid (see Vinoa rosea). 



Old Man (see Artemisia, Abrvtaintni, and Ros- 



marimis offiici nalis) , 

 Old .Van Cactus (see Pllocerrv* fpnilix). 

 Old Man's Heard (see Clematis Vitalla). 

 Oleaster (see Olca ewropeea). 

 Olcobacltia (see Stereulia). 



39 



OLEARIA (fyn. EUBYBIA). 



Description. A rather large genus of greenhouse, 

 half-hardy, or hardy shrubs and trees (ord. Com- 

 positse), of which only a few have been introduced. 

 They are generally very ornamental both in foliage 

 and flower, and the hardy species ought to be more 

 widely cultivated on walls or in the open. 



Propagation. By seeds, sown under glass in 

 spring, by cuttings of ' half-ripened shoots struck 

 under a bell-glass in neat, or by cuttings of old 

 wood with a heel under glass, and by layers in 

 autumn. 



Soil. Almost any soil, but the hardier species 

 should have a warm, dry one. 



Principal Species : 

 argophylla, 4', Jy., wh. macrodonta, 6', sum., 



Muskwood. hlf-hdy., wh. (sytt. 



Haastii, 4' to 6', Aug., dentata of Hooker Jil.). 



hdy., wh.; a good sea- stellulata, 4', sum., wh. 



side shrub (seep. 13U). ( V .V> V - gumiiana and 



ilicifolia, 6', sum., hdy., Eurybia guimiana) . 



wh.; Musk-sceuted. lyrata, wh. (syn. O. 



lyrata). 



Other Species : 

 Forsteri, sum., hdy. or nitida, hdy., wh. 



hlf-hdy., wh. uummularisefolia, 1' to 8', 



furfuracea, 10', sum., hdy., wh. 



grh., wh. ramulosa, 6', aut., grh., 



insiguis, 3', grh., wh. wh. (xyn. Eurybia 



myrsinoides, My., pale aculeata). 



pur. (si/ns. Aster Traversii, 30', grh., hdy. 



myrsinoides aud Eury- m sheltered places, wh. 



bia myrsinoides). (syn. Eurybia Traversii). 



OLIBANUM. 



Frankincense is the English translation of the 

 Hebrew Lebonali, the Greek Libanos, and the 

 lioman Tims, and all are supposed to refer to the 

 gum rfsin obtained from various species of Bos- 

 wellia that grow in Arabia and Somaliland. The 

 modern commercial equivalent of the title (Frank- 

 incense), so common in Bible history, is Olibanum. 

 Olibanum is a yellowish, semi-transparent, bitter, 

 and brittle resin that has some medicinal value, but 

 is most largely used as incense in Roman Catholic, 

 Buddhist, and other relieious services. When 

 burned, Olibanum gives off a strong aroma that is 

 said to prevent mosquito and other insect attacks. 

 The gum is obtained by making incisions in the 

 stems of the tree and allowing the exudation to 

 harden in tear-like masses. Boswellia Carteri 

 and B. frereana are the chief sources o 

 Olibanum. 



OLYRA. 



A genus of tropical Grasses (ord. Graminerc), 

 only two of which have yet been introduced. 

 Propagation, by seeds and division. Soil, rich, 

 well-drained loam. 



Principal Species : 



concinna, stems (i" to 10", Jan., st. ev., an elegant 

 pot plant. 



OMPHALODES. (NAVBLWORT.) 

 Pretty annual or perennial herbs (ord. Boragineai), 

 adapted for the border or rockery. They are prop- 



Olferiia (ce Arrnsttdium). 



Olibamim Tree (see liosivellm). 



Oliette (see Pn/mrrr .miiinfenim'). 



Olive (see Olea and Elteaymus). 



Olive Barlt Tree (Terminalia Catappa). 



Olive Wood (see Elarodendrori). J 



