Nut 
oblong 
scent one-seeded fruit, often 
vaguely applied to such fruits 
as those of the Labiatae and 
Cyperaceae; spu’rious~, a fruit 
which owes its hardness to some- 
thing other than the pericarp, as 
in Mirabilis; Nux bacca’ta, a nut 
enclosed in a pulpy covering, as in 
the Yew. 
nu'tant, nu’tans (Lat.), nodding. 
Nuta'tion (nutatio, a nodding), the 
revolution of the growing tips 
of young organs; revol’ving ~ = 
CIRCUMNUTATION. 
Nut/let, the diminutive of Nut, ¢f. 
NucwuLe; variously applied to any 
dry independent fruit, as an achene, 
or part of a schizocarp. 
Nu'tricism (nutricius, that nourishes), 
a form of symbiosis in which the 
Fungus becomes the nurse and 
feeder of the other symbiont, as in 
Monotropa ; Nutrit’ion, the process 
of promoting the growth or re- 
pairing the waste caused by vital 
phenomena. 
Nux (Lat., nut), see Nur. 
nyctan’thous (vii, vuxrds, night; 
dyOos, a flower), used of night- 
flowering plants; Nyctan’thy, the 
condition of nocturnal flowering ; 
nyctitrop’ic (tporj, a turning), 
placing the leaves as during the 
night; Nyctit‘ropism, assuming 
the sleep position. 
nymphaeform'is (nympha, a pupa, 
forma, shape); Koerber applies 
this to chrysalis-shaped spores of 
some Lichens. 
Oan’gium (adv, an egg, dyyelov, a 
vessel), an apocytial oogonium 
which forms oospores by free cell- 
formation, as in Saprolegnieae 
(Hartog). 
ob, as a prefix, means inversely or 
oppositely ; as obovate, inversely 
ovate ; sometimes, but incorrectly, 
used for gub-. 
obcla’vate (ob, inverse, clavatus, club- 
shaped), attached at the thicker 
end ; obcompres’sed, obcompres’ sus 
(compres'sus, pressed together), 
172 
flattened the other way, antero- 
posteriorly instead of laterally ; 
obcon’ic, obcon’ical,  obcon'icus 
(conus, a cone), conical, but attach- 
ed at the narrower end; obcor’- 
date, obcorda’tus ( + CORDATUS), 
inversely heart-shaped, the notch 
being apical; obcor’diform, obcor- 
diform’is, are synonyms ; obcrena’- 
tus (+ cRENATUS), t, denticulate; 
obcur’rens (currens, running), } run- 
ning together and adhering at the 
point of contact; obdiploste’mo- 
nous, -ws (d:rdéos, double, orjpwr, 
a thread), where the stamens are 
double the number of the petals to 
which the outer series are opposite ; 
Obdiploste’mony, the condition it- 
self; obim’bricate, obimbrica’tus 
( + IMBRICATUS), when the imbri- 
cation is from above, downward ; 
oblan’ceolate, oblanceola’tus (+ 
LANCEOLATUS), strictly speaking 
this cannot occur, but the word is 
used for tapering towards the base 
more than towards the apex; ob’late 
(latus, broad), flattened at the 
poles, as an orange. 
obligate (obligatus, obliged), neces- 
sary, essential ; the reverse of FA- 
CULTATIVE ; ~ Gam’ete, a gamete 
which is incapable of further de- 
velopment without union with 
another gamete; ~ Parasite, an 
organism in which parasitism is 
imperative in order to attain com- 
plete development; ob‘ligatory, 
ob’ligative, as in OBLIGATE; ~ 
Sym’biont, an organism which is 
dependent upon another for its 
existence. 
oblig’ulate, obligula’tus (ob, inverse, 
+LIGULATE), used of ligulate florets 
of Compositae extended on the 
inner side of the capitulum instead 
of the outside; obligu'lifiorous ( los, 
floris, a flower), florets which are 
obligulate, as in Zoégea. 
oblique’, obdli’guus (Lat., slanting), 
(1) slanting ; (2) of unequal sides. 
oblit’erated (obliteratus, erased), sup- 
pressed ; Oblitera’'tion, suppression. 
ob’long, oblon’gus (Lat., rather long), 
