89 
Oblatum, Oblata — A flattened sphere, as 
some fruits. 
Ob' LIGATE — Xecessary, essential. 
Ob'ligate PAEAJiiTE — Auorgaiiisim tu which 
a parasitic life is indispensable for the 
attainment of its full development. 
Oblig'ulatb, Obligi'i.a'tcs — When the 
corolla of a hgnlate floret (inOompositse) 
is extended on the inner instead of the 
outer side of acapitulum. 
Oblique', Obli'quus— When the midrib of 
a plane leaf being nearly honxontal, 
but pointing somewhat towards the 
ground, the limb itself is more or less 
inclined to the horizon, owing to a 
twi-st in the petiole or in the base of the 
limb. Also, when a plane leaf is so 
divided by the midrib that the divisions 
on each side are slightly unequal, as 
the base of many Kucalypt le;\ves. 
Ob'lokg, Oblokg'ub — O f an elliptical shape, 
where the major and minor axis bear a 
proportion to each other (jf about four 
to one. 
Obova'lis — U sed as a synonym for “Obo- 
vate.” 
Obo'vate, Obova'tcs — When the point of 
attachment is at the narrow end of the 
ovate form. 
OBRIN'GENS—When the ringent corolla of 
a floret (in Compositfe) has the interior 
lip composed of one-fifth, and the 
l>osterior of four-fifths, of tho whole. 
Ob'scurus — (.) f a dark or dingy colour. 
Obsthuo'tl'.s — Where hairs, cilia? or other 
appendages partially close tlie throat 
of a tubular coroUa. 
Obsub'ulate, Obsubu la'ti’s— Very narrow- 
pointed at t!ie l:-asp, but gradually 
widening a little towards the a]iex. 
Obsutuka'lis (06, over against, sutura, a 
suture) — Applied to the suture of a 
pericarp. 
Obtura'tou — A sma‘11 body which accmn- 
puiiies the pollenic masses of Orchideje 
and Asclepiadeaj, chasing tiie opening 
of the anther. 
Obtu'bus — Blunt. Obtubius'culus — 
Somewhat blunt. 
Obvalla'tus — When consecutive pairs of 
o})posite leaves are arranged at small 
angles of divergence front each other, 
and not in a brachiato manner, where 
the angle is a right «ajigle. 
OBVEii'.sUB — V'hen the point of the radicle, 
in the seed, a])proaches the hilum. 
Obvoluti'ous— When the margins of leaves 
or petals, in the bud .state, are mutually 
enrolled one ■within the other. More 
especially applied to two plicate leaves, 
which, in vernation, have e.ach one 
margin embraced by the folding of the 
other leaf. 
Ocean'tdub — B elonging to the Ocean. 
Synonym for “ liydrophyton.” 
Occulta'tus— H idden. 
Ocella'tus, OcELi-ATK — S])ottcd in a 
manner somewhat reacmbling the pupil 
and iris of an eye. One s}K)t of colour 
within another spot, as the pink-eyed 
variety t^f Vinca roistay var. occllata, an 
abundant w'eed in Queensland. 
Ochra'ceus— The colour of yellow-ochre ; 
yellow, with a little grey. 
Och'kea— See “Ocrea.” 
OcHKOLEu'eUB — Of a p.T-le yellow, with a 
faint tinge of dingy yellow. 
OcHROBHLO'iA — ^Yellow bark, as Eiicalyp- 
tm ockiSfphloiay the Paroo Yellow 
jacket. 
O'cREA — A membranous sheath at the base 
of some leaves, wlu'cb cla.spa the stem, 
(See Pobjyonum oricntalef a tall showy 
weed of .swampy land.) 
Oct or OcTO — Eiglit in composition. Thus : 
Ootagy'nia, flowers with eight pistils 
or eight free styles ; Ocxax'dria, 
flowers with eight stamens ; Ootogy- 
synonym for “ Octjtgynia 
Octo'nc.s, eight together; Octoste'- 
MONi;s, with eight free .stamens. 
Oc'ULUS — The first appea-ranco of a bud, 
especially the bud on a tuber. Also a 
small depression on the summit of 
fruits, as the Apple and Pear. 
Odes, Oipes- A bu’ininabion denoting simi- 
larity, reseinblaiice. 
Odoiia'ti*s— Po.sse-ising any decided odour 
though more generally restricted to 
such as are sweet, as the itesedn odovata, 
Mignonette. 
Officina'lib — Applied to those plants 
which are or inay have been considered 
useful in medicine or the arts, as Ver- 
bena o^ieinalist the Holy Herb. 
Olea'cinous, OLEACiN’t’s — Succuleiit and 
oily ; also like oil. 
O'lexs— S trong-scented, wdiether agree- 
able or nauscjous. 
Olera'C'EOUS (Prom olatf, a pot herb) — Escu- 
lent, eatable, as the Pig-weed, Portu- 
laca olcracta. 
Ol'igos— Pew, or in small mmiljer ; in com- 
position, ‘’OUgo”and “Olig.” 
Oli'gos (In Greek conifjounds, a small 
number) — It is generally used in con- 
trast with many (poly), when no .speci- 
fic number is employed, as in the defi- 
nition of things the number of which 
is small, but variable ; thus olUjocar- 
jtous is applied to sori, in which the 
spore-ca.^'cs are few in number; oligor- 
rhh.a. where the roots are few in num- 
ber, as in the Httlc Duck-weed, Lemna 
olitiorrhiia. 
Oliva'ckub— Of an olive-green colour ; 
orange and grey. (See Sarcodiilus 
olivactus.) Oliv.e'formis, Olivifoii'mis 
— Shape^d like an olive, ellipsoidal. 
(15ee fruitof Ohrii&ophyUain oUvfiJorme.) 
0-iiOPLF-'piii'Ti3t — Symmym for a jdant 
with a inonadclphuus flower, because 
the stamons arc blended together into 
one bundle. 
Omph.^lo'dicm (Prom ohipbaJosii the n<avel, 
arid Hdon, a resemblance) — The mark 
left in the hilum by the passage of the 
vessel.s of the raphe. 
Onojiatologv — That branch of knowledge 
which relates to tho rules to be observed 
in the construction of names. 
Ontog'eny — D evelopment of an individual. 
OuGAMY — Conjugation of two gametes of 
dissimilar form. 
