1112 OAKESIA 



sessilifdlia, Wats. Stem once forked: Ivs. oblong- 

 lanceolate, acute at each end ; margins minutely sca- 

 brous: capsule borne on a distinct stipe. Canada to Fla. 

 and Ark. B.M. 1-402. L.B.C. 13:1262. G.W.F. 16. D. 51. 

 F. W. Barclay and W. M. 



OAT. Avena sail,;,. 



OBELISCARIA. 





1508. The wide-spreadme Live Oak of the South 



(See Oak, nage IIU.) 



6CHNA (old Greek name for a wild pear, which some 

 of these plants were thought to resemble in foliage). 

 Ockndce(F. O. nntUinora is a cool greenhouse shrub 

 cult, by a few fanci(>rs for its remarkable appearance 

 when in fruit. 'I'ln' tU. an- yellow, appear in spring, 

 and are borne- to ili,- mnnli. r of 10-1.5 in racemes ter- 

 minating short lat. ral hranc-Iies. The blossoms are 

 short-lived, but tin- i-al\ x is persistent. Its 5 sepals are 

 greenish in flower, but lic^conie abright red in fruit. The 

 receptacle increases until it becomes an inch or so thick, 

 globular and bright red. Upon it are borne black seed- 

 like bodies, which are the carpels. The red and black 

 make a fine contrast. This rare plant is best prop, by 

 cuttings struck in autumn. It is cult, in America, but 

 not advertised. 



Ochna is a genu.s of about 25 species of trees and 

 shrubs from tropical Asia and Africa: Ivs. deciduous, 

 alternate, minutely serrate, leathery, shining : fls. yel- 

 low, 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 ; lobes 1-celled, 

 1-ovuled; styles connate; drupes 3-10, sessile. 



multilldra, DC. Glabrous shrub, 4-5 ft. high: Ivs. 

 oblong-elliptical to oblanceolate-oblong: petals sessile: 

 anthers as long as the filaments, opening longitudinally : 

 sepals in fruit about 4 lines long. Upper Guinea. 



G. W. Oliver and W. M. 



Orhtu, nnillifhrni is a r.-,i,ark,-i).lv l,nnds..„ip shrub 

 for i-on-r, ,;ii,,n ,1 ■.■III. -11 II i^ii^ii.iIIn I i J ; I I'dcd as 



nate 



effect, 

 stand 

 intrast 

 inding 

 is ger- 



year. We have nut. been so torinnate witli c-uttings. 

 Unfortunately for us, cat -birds appropriated all the 

 berries as soon as they became ripe. They entered 

 through the open spaces in the annex to our conserva- 

 ♦"•■y- T. D. Hatfield. 



CCIMUM. See Basil. 



OCOTILLO. FoxiquUria splcndcnx. 



ODONTADfiNIA (Greek, tootJied glandu). Apocij- 

 ndcece. Here belongs the fine tropical yellow-Hd. 

 climber sold as Dipladenia Harrisii, which rivals in 

 beauty the well known greenhouse Allamandas. The 

 fls. are fragrant, about 3 in. across, funnel-shaped, with 

 5 rounded, spreading lobes, and are more or less 

 streaked with red in the throat, at the base of the lobes, 

 and on the back of the tube. The treatment which George 



ODON'TOGLOSSUM 



McW^illiam has given Dipladenias with such good result s 

 (see Dipladenia, Vol. I) should be attempted for Odon- 

 tadenia, but O. speciosa perhaps grows at lower alti- 

 tudes, and may require the treatment usually given to 

 hothouse vines. AH Odontadenias have yellow lis.. 

 while Dipladenias are vcllow only in the throat. 



OdoiitM.I.-ria i-i :> l-.'-tius of about 8 species of tall. 



shrubl.v. T,..,.,.;,i \ I...,, I , -limbers: Ivs. opposite: 



cymes I . :l. laii I y few-fld. and scarcely 



branch. il: i . 1 1n- loins remarkably blunt or 



roundi-il; lii-Mi l.i.i - i .m-Ii .1 in the pointed bud, over- 

 lapping to till- riglit aii.l twisti-d to the left; stamens 

 fixed at the top of tlio narrow part of the tube. Tlio 

 genus is distinguished from Dipladenia by the shape of 

 the calyx-lobes and by the cup-shaped group of toothed 

 glands below the pistil. 



specidsa, Beuth. (DipUulhua Mdrrisii, Hook.). 

 Shrubby, branched climber: largest Ivs. 10-15 by 4-.') 

 in., oblong, tapering, scarcely leathery, feather-veined, 

 often purplish beneath; petioles stout, scarcely 1 in. 

 long: racemes axillary and terminal; pedicels red, often 

 1 in. long, curved downwards : corolla-tube with a round- 

 ish base about % in. long and thick, then suddenly con- 

 stricted, then gradually widening into a funnel-shaped 

 fl. Brazil, Guiana, Trinidad. B.M. 4825. yf_ m, 



in allusion 

 e. A genus 



orchiil- . iiii-i-ai Ml- III I imi M"'" -. iiativesof the 



gher rr-:i-M ..I i .i . \i .i. i m M. i. .. mul Guatemala 

 Coloiitii I III I I. I'll! ,.1 their hand- 



lost favorite 

 the finest of 



with short rhizomes and 2-lvd. 

 ith sheathing leaves at the base: 

 " s nrisiii._'from 



orchids of cuiLn aioi 

 all orchids. 



Plants epiphytic, 

 pseudobulbs, often 

 fls. in few- to many-fld. racemes c 



the base of the pseudobulb; sepals .nil piiiU ^i-i-cad- 

 ing, free, or the lateral sepals ran 1 . i i united 



at the base; base of the labelluni a i i n.-ito 



the column and sometimes adnati- ti. i In liii.i; lateral 

 lobes Kiiiiill. olt.-ii iri-,-i; middle lobo large, spreading, 

 variously ^Im |.- -I : i-'iliMnn clavate, narrowed at the base, 

 longer tli.-ui in i hirnliuin. 



This g.-nns is ilos.ly related to Oncidium and Mil- 

 tonia, some of the species of the latter being generally 

 cultivated as Odontoglossums. These two genera are 

 easily distinguished from Odontoglossum by the label- 

 lum, which expands directly from tlin base of the col- 

 umn. Tllore is r,.-,-l,al- im' L'.-tm- <■( or-l.i.ls i„ which 



the 



spe 



ated 



than 

 the spe 

 many n 



Odontoglossums folio- 

 ranges fi-iiiii --iiiinii III 

 usually ; II .' i! 



they an- i- . .i .i. ■ ■■ 

 annual r.nni.ili i . .. . ~ 

 or less evi^h and . ..ol iln 

 .The extreme heat of oi 

 with the culture of Odoi 

 cially those of the O. en 

 sary to use every prec 



n Peru, and 

 exceptions, 

 IS where the 



A lean-to or half-span roof structure of northern ex- 

 posure, protected by a brick or stone wall on the south 

 .side, and with ample means of ventilation, is best suited 

 to Odonto-losMim rnltiin^. ^for.ovri-. if sliouM be pro- 

 vided Willi i-ollinL- sliinli', ,lr\^ali-il on I'l-anmuork IH or 



20 in. al.im- ihr -i:,--. i,. alTonl almn.l.'ii f li-lit. free 



access of air .-ni.l ni|iMMl,- sha.l.-, will, lln- ad.lilional 



The interior is best fitted with solid beds, if possible, 

 but benches of stone flags or wood covered with ashes 

 or gravel an inch or two deep will answer very well. 



