o 



OAK. Plants of tlip genus Qi'.orcus (which see). 

 The woni is also applied to other plants to some extent, 

 from reseniblanees in form of tree, in leaf, or in hard- 

 ness of wood. In .\ustralia, where there are no species 

 of Quereus, the word oak is applied to the species of 

 Casuarina, "from a fancied resemblance," as Maiden 

 sa\-s, "of the wood of casuarinas to that of oak." 

 Other plants in .\ustralia are sometimes known as 

 oaks. The silk oak of florists is Grerillea robitsto. The 

 Jenisalem oak is Chcnopodium Botrijs, probably from 

 the shai)e of the leaves. Poison oak is RhxLS Toxicoden- 

 dron, and related species. 



OAKESIA (\Vm. Oakes, New England botanist, 

 179S)-1S4S). Liliacex. Three species of native per- 

 ennial woods 



herbs, having r .v^jga^aut; — "^^'jf^ 



the graceful 

 habit of such 

 choice wild flow- 

 ers as the Solo- 

 mon's seal and 

 more particu- 

 larly the com- 

 mon bell -wort, 

 Uvularia perfoli- 

 ala. 0. sessili- 

 folia has been 

 offered by a few 

 dealers in hardy 

 plants. It pre- 

 fers a rich light 

 soil in a rather 

 moist, parti all J' 

 shaded position, 

 and improves 

 under cultiva- 

 tion. 



Oakesia can 

 be easily distin- 

 guished from 

 U\'ularia by the 

 Ivs., which are 

 merely ses.sile 

 instead of per- 

 foliate, by the 

 angled rather 

 than terete sts., 

 and fls. opposite 

 the Iv.s. rather 

 than terminal. 

 Oakesia was 

 separated from 

 Uvularia in 1879 by Watson. Lately the name Oakesiella 

 has been applied to the genus Decau.se there is an 

 earlier Oakesia fwhioh, however, is an untenable name 

 for Coremaj. By some botanists, the species are still 

 retained in Uvularia. Other generic characters are: 

 fls. few, solitary on short pedicels opposite the Ivs.; 

 segma. without callosities: caps, membranous, ellip- 

 tical, winged, acutish at ea<;h end, very tardily dehis- 

 cent: Ivs. more or less rough on the margins: seeds 

 globose, with a tumid raphe but no aril. 



sessUifdlia, Wats. (Uvularia sessilifdlifi, Uinn. Oalo- 

 eJsielUi wxnili/Uia, SrnaU;. St. once forked: Ivs. oblong- 

 lan(*f)late, acute at each end; margins minutely sca^ 



brous: caps, borne on a distinct stipe. Canada to Fla. 

 and .Vrk. B.M. 1402. L.U.C. 13:1262. L. H. B.f 



OAT: Arena sativa. 

 OBELISCARIA: Lepachys. 



OBERONIA (Oberon, king of the fairies, because 

 of the quaint flower forms). Orckidacese . Perhaps 100 

 tufted cjiiphytic orchids in Trop. Asia and Austral, 

 and Pacific islands, little known in cult., but of much 

 botanical interest. Lvs. distichous, ensiform or terete: 

 lis. very small, in den.se spikes or racemes, in the cult, 

 species yellow, orange or buff; sepals free, equal or 

 nearly so, oblong or broadly ovate, larger than the 

 petals; Up sessile, usually concave, entire or toothed. 



They probably 

 require warm- 



2560. The white oak. — Quereus alba. 



'Li««(4^\. i3^i ? t ?«,'f'«i some of them 



will grow on 

 blocks. None of 

 the species seems 

 to be regularly 

 in the trade here, 

 but odd or par- 

 ticular plants 

 are sometimes 

 offered, as O. 

 tahilensis, Lindl. 

 (O. iridifblia. 

 B.M. 4517, not 

 Lindl.), O. My- 

 osimis, Lindl., 

 O. ensiforinis, 

 Lindl. (O. acaii- 

 fe, Hook. B.M. 

 .505(5). 



OCHNA (old 

 Greek name for a 

 wild pear, which 

 some of these 

 plants were 

 thought to re- 

 semble in foh- 

 age) . Ochnacex. 

 Glasshouse 

 woody plants, 

 httle grown for 

 the odd .showy 

 bloom and fruit. 

 Ochna is a 

 genus of about 

 2.5-30 species of trees and shrubs of Trop. Asia and 

 Afr., and a few in S. .\fr. : lvs. deciduous, alternate, 

 minutely serrate, leathery, shining: fls. yellow, rarely 

 greenish, jointed to the pedicels; sepals 5, colored, 

 imbricate, persistent; petals .5-10; stamens indefinite; 

 anthers opening longitudinally or by pore-like slits; 

 ovary deeply 3-10-lobed, the lobes 1-celled, 1-ovuled, 

 and seated around a central disk or receptacle and 

 becoming .sessile drupes, styles connate. 



multifldra, DC. Glabrous shrub, 4-5 ft. or more 

 high: lvs. oblong-elliptical to oblanceolate-oblong: 

 petals .sessile; anthers as long as the filaments, opening 

 longitudinally, sepals in fr. about 4 lines long. Upjier 



^m^'^:0^^: 



ii n\i.'iH,, 





(2318) 



