OMA ONC 
ONC ONO 
by the Greek authors. Linn. 21, Or. 3, Nat. Or. 
Graminea. Worthless plants, of easy cultivation. 
Synonyme : 1. 0. paniculata—latifOlid 1, pauci- 
jiora. ’ 
Omalanthus, Adrien Jussieu. From homalos, smooth, 
and antkos, a flower. Linn. 21, Or. 10, Nat. Or. 
Euphorbiacex. A pretty stove shrub, cultivated in 
peat and loam, and propagated from ripened cut- 
tings in sand, under a glass, in heat. 
populifoltS . . . White . . 8, S. Ev. S. N. Holl. . 1825 
OMiME-pr.ANT, see Plectranthius terndtds. 
Omphalea, Linn. From omphalos, navel ; umbilicated 
anthers. Linn. 21, Or. 10, Nat. Or. Euphorbiacex. 
Interesting trees, from twelve to twenty feet high, 
cultivated in a mixture of peat and loam, and pro- 
pagated from cuttings in sand, under a glass, in heat. 
diandra .... Apetad . S Ev. T. W. Ind. . 1820 
densifdlia . . Apetal . S. Ev. T. Cuba . . 1823 
triandra . . . Apetal . 6, S. Ev. T. Jamaica . 1763 
Omphai.6bium, Gxrtner. From omphalos, a navel, 
and lobos, a pod. Linn. 10, Or. 1, Nat. Or. Legu- 
minosx. A genus of very pretty plants ; for culture 
and propagation, see Scholia. Synonymes : 1. Con- 
narus africanus. 2. C. asiaticus, Rhus Rxdxlijavel. 
africanum, 1 . . Pa. red . S. Ev. S. Guinea . . 1822 
Indicum, 2 . . . Pa. red . S. Ev. S. Ceylon . . 
0MPHAI.OBIUM, see SchOtid. 
Omphalodes, Tournefort. From omphalos, the navel, 
and eidos, like ; the fruit resembles the navel : 
whence the genus has been called Venus’s Navel- 
wort. Linn. 5, Or. 1, Nat. Or. Boraginacex. These 
plants are very elegant border -flowers, and of the 
easiest culture. The perennial kinds grow well 
under the shade of trees and shrubs, and are in- 
creased by division. The seed of the annual spe- 
cies should be sown in the open border in spring. 
Synonymes: 1. Cynoglossum brassicxfolium. 2. C. 
linifolium. 3. C. nitida. 4. scorpioides. 5. An- 
chusa sempervirens. 6. C. omphalodes. 
amplexicatllls, 1 . White . 7, H. Her. P. Spain . . 1823 
linifOlia, 2 . . . White . 7, H. A. Portugal . 1748 
littoralls . , . ^V^lite . 7. H. A. France . . 1826 
myosotoldee . . Brush . 9, F. Her. P. Russia . . 1838 
nitidOm 3 . . White . 6, H. Her. P. Portugal . 1812 
scorpioides, 4 . . Blue . . 7> H. Tr. A Bohemia . 1825 
sempervirens, 5 . Blue . . 6, H. Her. P. Britain . . 
vernii, 6 . . . Blue . . 3, H. Her. P. S. Eur. . .1633 
ONCimu^ Srvartz. Derived from ogkos, a tumour ; 
tH^’^'fliSits belonging to this genus have warts, 
tumours, or other excrescences at the base of the 
labellum. Linn. 20, Or. 1, Nat. Or. Orchidacex. 
This is an extensive and very handsome genus of 
plants, every one of which is highly deserving a 
place in every collection. 0. papilio bears a strik- 
ing resemblance to a butterfly on the wing. 0. 
altissimum throws up from fifteen to twenty flower- 
spikes, producing as many as two thousand flowers, 
the colour of which is yellow spotted with brown, 
and there is the splendid 0. Lanceanum, one of the 
most prized in this valuable genus ; but to par- 
ticularise, where all are remarkable either for the 
beauty or the sin^larity of the flowers, would be 
invidious. The large-leaved kinds do best when 
grown in rustic baskets, which can readily be sus- 
pended from the rafters of the house ; the basket 
should be made of small pieces of oak nailed toge- 
ther, or holes may be bored, and a piece of strong 
wire run through near the end of each, and fastened 
at the bottouL Some moss and rotten wood should 
be placed in the bottom previous to putting the 
plant in, in doing which, care must be taken not to 
insert the plant too deep. Moss and rotten wood 
must surround the roots of the plant, but should 
not on any account be raised higher than the roots 
of the leaves, or they will be liable to damp oflF. 
The small-growing kinds, as O. iridifolium, should 
be fastened on wood, and treated as the Burling- 
tonias. The other kinds, as 0. papilio and O. altis- 
simum, require to be potted sii^arly to the genus 
Stanhopea. Synonyme: 1. O.juncifolium. 
altissimum ... YeL brn. . 3, S. Epi. Panama . 1793 
ampliatum . . . YellOw . 3, S. Epi. Panama . 1793 
barbatum . . . Yellow . 4, S. Epi. Brazil . . 1818 
Bauerl .... Yel. brn. . 4, S. Epi. 
bicornutOm ... YeL spot. . 6, S. Epi. Rio Jan. . 1830 
bifollum .... Yel. pur. . 7, S. Epi. M. Video . 1811 
carthagintnse . . Olive . . 6, S. Epi. Carthage . 1791 
Cebolleti, 1 . . . YeUow- . 4, S. Epi. W. Ind. . 1825 
ciliatum .... Yel. red. 1, S. Epi. Brazil . . 1818 
citrinum .... Yellow . 8, S. Epi. Trinidad . 
confragosum . . Straw . . S. Epi. Mexico . . 
cornlggrum . . . Yellow . 7, S. Epi. Brazil . . 
crlsptim .... Orange . 6, S. EpL 
delloldeum . . . Yellow . S. Epi. Lima . . 1836 
Devonianum . . YeL grn. . 1, S. Epi. Guatemala . 1836 
divaricatum . . . Yel. bm. . 12, S. Epi. Brazil . . 1826 
flexubsGm . . . Yellow . 6, S. Epi. Brazil . . 1818 
ForbesII .... Scar. yeL . 9, S. Epi. Organ M. . 1837 
Harrisonianum . . Yellow . 5, S. Epi. Brazil . * 
intermedlOm . . Orange . S. Epi. Cuba . . 
iridifolium . . . Yellow . 6, S. Epi. Mexico . . 1835 
LanceSniim . . . Grn. pur. . 8, S. Epi. Mexico . . 
Lemonianum . . YeL spot. . 3, S. Epi. Havannah . 1836 
leucocbllum . . . Wht. red . 8. S. Epi. Guatemala . 1835 
lunatum .... Orange . 6, S. Epi. Demerara . 1836 
lurldum .... Olive . . 3, S. Epi. Jamaica . 1822 
guttatum . . . Yel. red . S. Epi. Jamaica 
ornithorynchum . Pink . 7» S. EpL Mexico . . 1826 
papilio .... YeL pur. . 6, S. EpL Trinidad . 1823 
pubes Gm. red . 4, S. Epi. Brazil . . 1824 
pulchellum . . . Wht. spot. 5, S. Epi. Jamaica 
pulvinatum . . . Yel. brn. . 6, S. Epi. Brazil . . 1836 
pumllum . . . Yellow . 5, S. Epi. Brazil . . 1824 
ranlforum . - . Yellow . 8, S. EpL Brazil . . 1838 
major .... Yellow . S. Epi. Brazil . . 
reflOxum .... Yellow . 10, S. Epi. Mexico . . 1836 
Russellianum . . Pur. gprn. . S. Epi. Rio Jan. . 1835 
sanguInOum . . . Stra. crim. S. Epi. La Giiayra . 
stramluOum . . . Straw . . S. Epi. Vera Cruz . 
Tayleurll . . . Brown. . S. Epi. Mexico. . 1837 
tetrapOUIlum . . YeL bm. . S. Epi. Jamaica 
triquetrum . . . Wht. pur. 9, S. Epi. Jamaica . 1 793 
unicorne .... Pa. yel. . 6, S. Epi. Rio Jan. 
variegatum . . . Yellow . 7, S. Epi. W. Ind. . 1824 
viperluum . . . Pa. yel. . S. Epi. Jamaica 
Oncorh7nchus, Fischer and Meyer. Derived from 
onkos, tumour, and rhynchus, beak ; alluding to the 
lip. Nat. Or. Scrophulariacex. 'The seed of this 
pltint may be sown m any common garden soil, 
tenellus .... H. B. . 1837 
Oniox, see AlllUm CSpd. 
OnobrSma, Decandolle. From onos, an ass, and Aroma, 
food; favourite food of the ass. Linn. 19, Or. 1, 
Nat. Or. Compositx. Ornamental plants, succeed- 
ing in any common soil, and increased by cuttings, 
divisions, or seeds. Synonymes: 1. Carthamus ar- 
borescens. 2. C. cxruleus. 3. C. cynaroides. 4. C. 
glaucus. 6. C. loucocaulis. 
arborescgns, 1 . . Yellow . 7, 0. Ev. S. Spain . .1731 
coeruleum', 2 . . Blue . . 6, H. Her. P. Spain . . 1640 
cynaroides, 3 . . White . 6, H. Her. P. Caucasus . 1820 
g'laucum, 4 . . Purple . 7, H. A. Tauria . .1817 
leucocauldn, 5 . Wlute . 6, H. Her. P. Greece . . 1800 
Onobr^chis, Tournefort. From onos, an ass, and 
brycho, to gnaw ; plants grateful to the ass. Linn. 
17, Or. 4, Nat. Or. Leguminosx. All the species of 
Saintfoin are very showy, and well suited for 
ornamenting rock-work or flower-borders. The 
herbaceous kinds grow best in pots, in a mixture 
of chalk, sand, and loam ; they succeed best when 
raised from seed, which should be sown where the 
plants are to remain. Synonymes: 1. 0. orientalis. 
2. 0. picta. 3. Hedysarum Onobrychis. 4. H. saxa- 
tile. 
arenSrli . . . Red • . 7, H. Her. P. Siberia . .1818 
alba .... White . . 6, H. Her. P. Hungary . 1804 
capQt-galll . . Flesh . . 7, H. A. France . . 1731 
carpatica . . . Purple . 7, H. Her. P. Carpal. . . 1818 
conferU . . . Purple . 7, H. Her. P. Iberia . . 1817 
comuta, 1 . . Red . . 7, F. Ev. S. Caucasus . 1816 
CrisU-gaUI . . Flesh . . 7, H. A. S. Eur. . . 1710 
echinata . . . Flesh . . 6, H. Her. P. Calabria . 1831 
FontanesH . . Red . . 7, H. Her. P. Tunis . . 1820 
glabra .... Purple . 7, H. Her. P. Tauria . . 1816 
gradlls . . . Pa. red . 7, H. Her. P. PodoUa . . 1820 
marebtica ... Pa. red . 7, H. Her. P. Caucasus . 1820 
Michauxll, 2 . Pa. red . 7, H. Her. P. Levant . . 1820 
montana ... Purple . 7, H. De. Tr. S. Eur. . . 1817 
PallasH . . . Pa. yeL . H. Her. P. Iberia . . 1820 
petrma . . . Wbt. red. H. Her. P. Caucasus . 1818 
procumbans . . Purple . 7, H. De. Tr. Iberia . .1819 
ptolemaica . . Yellow . H. Her. P. Egypt . . 1816 
radiata . . . Pa. yeL . H. Her. P. Ibena . . 1818 
Eatlva,3 . . . Pa. pink . 7, H. Her. P. Britain . . 
saxatllls, 4 . . LL yel. . H. Her. P. S. Eur. . . 1790 
supina . . . Pa. red . H. Her. P. SwitzerL . 1819 
Unaltica . . . Purple . 7. H. Her. P. Caucasus . 1817 
OnSclSa, Linn. From onos, a vessal, and kleio, to 
inclose ; referring to the apparent capsules. Linn. 
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