OAK 
o. 
O AK, see QiiSrcut. 
Oat-grass, see Aveni. 
Ob is used in the composition of Latin technicals to 
indicate that the thing is inverted, as obovate is 
inversely ovate. 
Obbatus, bottle-shaped. 
Obconical, inversely conical. 
Obcordatelt two-lobed, inversely -cordate, with the 
indentation very deep, so as to appear of two lobes. 
Obesia, Harvorth. From obeaue, fat ; alluding to the 
flowers. Linn. 5, Or. 2, Nat. Or. Aaclepiadaceae. 
This is an interesting genus of little plants ; sandy 
loam suits them, and young cuttings root in sand, 
under a glass. Synonymea: 1. Stapelia geminata. 
2. S. aerrulata. 
decfira . , . . Yel. 8tr. . 3, G. Ev. S. C. G. H. .1795 
geminaw, 1 . . Purple . 3, 0. Ev. S. C. G. H. . 1795 
aerrulata, 2 . . Purple . 7, G. Ev. S. C. G. H. . 1805 
Obiiquely-repand ; a leaf having a margin undulated, 
and unequally and obliquely dilated, is said to be 
obliquely -repand. 
Obliquei.t-trunca.tk, cut off in an oblique manner. 
Oblong, when joined by a hyphen to another word, 
signifles a form between the two words, as oblong- 
elliptical, oblong-linear, and so on. 
Obixjng-triquktrous, oblong and three-sided. 
Obovate,! inversely egg-shaped, with the broadest 
Obovoid, J end uppermost. 
Obovate, when joined by a hyphen to another word, 
signifles a shape between the two words, thus, 
obovate-spatulate, a shape between obovate and 
spatulate. 
r between obovate and 
Obovate-cuneatkd, J wedge-shaped, with 
Obovately-wedge-shapkd, j the broadest end up- 
L permost. 
Obsolete, hardly evident. 
Obsolbtely-toothed, scarcely toothed. 
Obtuse-angled, having blunt angles. 
Obvolote, having one part rolled on another. 
Occidental, coming from the west. 
OcHNA, Schreber. From ochne, the Greek name of the 
wild pear-tree; there is some resemblance in the 
foliage. Linn. 13, Or. 1, Nat. Or. Ochnacece. The 
species of this genus are said to be very ornamental ; 
they grow from six to eight, and O. arborea to 
twenty, feet higjr. Sandy loam and peat mixed 
suit them, and cuttings root in sand, under a glass, 
in heat. Synonyme: 1. O. aquarroaa. 
lucIdA . . 
mauritlanS . 
miihiflor^ . 
nitidi . . 
obtusaU, 1 . 
. Yellow 
. Purple 
. Yellow 
. Yellow 
. Yellow 
. Yellow 
. Yellow 
S. Ev. T. C. O. H. , 
G. Ev. S. C. a H. . 
S. Ev. S. E. Ind. . 4 
S. Ev. S. Mauritius . 
S. Ev. S. S. Leone 
S. Ev. S. C. G. H. , 
S. Ev. S. E. Ind. . . 
OcHROLEucous, pale ^Uow, ochre-coloured. 
OcHROMA, Swartz. From ochroa, pale; referring to 
the flowers, leaves, and wool of the seeds. Linn. 
16, Or. 2, Nat. Or. Sterculiacece. Interesting plants, 
attaining from twelve to twenty feet high ; they 
grow best in sandy loam, and young plants are 
raised from cuttings in sand, under a glass, in heat. 
Lagopus . . . AVhite . . S. Ev. T. Jamaica . 1 804 
tomentosa . . . White. . S. Ev. T. S. Amer. . 1816 
OcHRosiA, Juaaieu. From ochroa, pale ; alluding to 
the wood. Linn. 5, Or. 1, Nat. Or. Apocynacece. 
A rather pretty shrub; for culture and propaga- 
tion, see Cerbera. Synonyme: 1. Cerbera borbonica. 
borbdnica, 1 . . S. Ev. S. Bourbon . 1823 
OcHRUs, Peraoon. From ochroa, yellow; on account 
of the colour of the flowers. Linn. 17, Or. 4, Nat. 
Or. Leguminoaoe. A pretty annual, of easy cultiva- 
tion in any common garden soil. Synonyme: 1. 
Piaum Ochrua. 
pallida, 1 . . . Yellow . 7, H. CT. A. S. Eur. . 
OcthSdiCm, Decandolle. From octhodea, warted ; 
alluding to the warted surface of the pods. Linn. 
15, Nat. Or. Cruciferce. A pleuit of little beauty 
and very simple culture. Synonymea: 1. Bunina 
®^.VP^*®ca, Rapiatrum cegyptiacum. 
eegyptiacum, I . Yellow . 8, H. A. Egypt . . 1787 
OcTANDROus, having eight stamens. 
OcTOGYNous, having eight styles. 
OcTOMKRiA, R. Brown. From okto, eight, and meria, 
a part ; in allusion to the pollen-masses. Linn. 20, 
Or. 1, Nat. Or. Orchidacece. The species of this 
genus are not of a very interesting character ; for 
culture and propagation, see Burlingtonia. 
gracilis .... Yellow . S. Epi. Rio Jan. . . 
graminifolii . . WhL yel. 5, S. Epi. W. Ind. . . 1793 
serratifblia . . . White . 10, S. Epi. Rio Jan. . . 
tridentata . . . Yellow . S. Epi. Demerara 
OcYMUM, Linn. From ozo, a smell; alluding to the 
powerful scent of the plants. Linn. 14, Or. 1, Nat. 
Or. Labiates. Some of the species of Ocymum, or 
Baail, are much esteemed as herbs, and are of the 
simplest culture. Synonymea: 1. O. criatalum. 2. 
O. caryophyllatum. 3. O. thyraijlorum. 4. O. cor- 
difolium. 5. O. americanum. 6. O. grandijlorum. 
7. O. montanum. 8. Plectranthua monachorum. 9. 
O. febrifugum. 
. 8, H. Her. P. E. Ind. 
. H. A. E. Ind. 
. 8, H. A. E. Ind. 
. 7. H. A. E. Ind. 
! 6| h! a!e. Ind.. .1806 
S. Her. P. Madagas. . 1825 
. 7. H. A. China . .1822 
9, S. Ev. S. Africa 
adscindens, 1 
album . . 
basilTcum . 
glabratum, 2 
pilosum . 
thyrsiflOrum 
Bojerl, 4 
cenum, 5 . 
filamentd^m, 
gratissTmum 
menthuides 
micranthum, 7 
minimum 
sanctum, 1 
suava 
virids, 9 
White 
White 
White 
White 
White 
White 
White 
. "White 
. White 
. White 
. IVhite 
. Pa. pur. 
. White 
. Purple 
. "White 
1822 
1816 
1548 
1817 
. 7, S. 1 
. 1802 
E. Ind. . .1751 
A. 
, 1816 
. 1573 
. 1768 
4 1816 
. 1816 
Madagas. 
. Wht grn. 9, S. Ev. S. Africa 
americanOm, ednfim, cordifbRtlm, grandiJlOrUm, gra- 
ttaalmQm, menthotdfa, mierdnthUm, pilOaUm, adnetum, 
audvi, virJdi. 
Odontarrhkna, Meyer. From odoua, a tooth, and 
arrhen, a m^e ; filaments. Linn. 16, Nat. Or. 
Crtuiferae. This pretty little trailer may be suc- 
cessfully cultivated in a mixture of loam and peat; 
cuttings. 
microphylla . H. Ev. Tr. . 1832 
ODONTOGI.OS8UM, Humboldt and Kunth. From odoua, a 
tooth, and glosaa, a tongue; alluding to the label- 
lum. Linn. 20, Or. 1, Nat. Or. Orchidaccoe. This 
plant is new to our collections. The flowers are 
described as very handsome, the sepals and petals 
being yellowish-green, richly blotched with brown. 
It will probably succeed well with the treatment 
given to Oncidiuma, and the like, 
cordatum . . . Grn. bm. . S. EpL Mexico . . 1837 
(Eceoclades, Lindley. From oikeo, to inhabit, and 
kladoa, a branch. Linn. 20, Or. I, Nat. Or. Or- 
chidacece. These are line plants, well deserving a 
place in every collection ; for culture and propaga- 
tion, see Vanda. Synonymea: 1. Angroecum fal- 
catum. 2. A. maculatum. 
falcate, 1 . . . White . 4, S. Epi. China . .1815 
maculata, 2 . . Ro. wht . 10, S. EpL Africa . . 1819 
CEdera, Crantz. In honour of George OEder, a Danish 
professor of botany at Copenhagen. Linn. 19, Or. 
5, Nat. Or. Compoaitoe. A pretty shrub, succeeding 
in sandy loam, mixed with a little peat, and pro- 
pagated in sand, or sandy soil, under a glass, 
prolifera . . . Yellow . 5, G. Ev. S. C. G. H. . 1789 
(EnanthM, Lamarck. From oinoa, wine, and anthoa, 
a flower; odour. Linn. 5, Or. 2, Nat. Or. Umbelli- 
ferce. These plants are mostly uninteresting, and 
of simple culture in any common soiL The juice 
of the leaves and stem of (E. crocota is a violent 
I 220 1 
