horological 
Hydroleucite 
horolog’ical (horologicus, pertaining 
to a clock), said of flowers which 
open and close at stated hours; 
Horolo’gium Flo’rae, a time-table of 
the opening and closing of certain 
flowers :—see Linnaeus, Phil. Bot. 
274; Kerner, Nat. Hist. Plants, ii. 
215-218. 
horten’sis (Lat.), pertaining to 
gardens, or only found there; 
Hortula’nus (Lat.) (1) a gardener ; 
(2) belonging to a garden ; Hor’tus 
(Lat.), a garden; ~ sic’cus, an 
herbarium ; formerly it consisted 
of volumes with dried specimens 
glued down. 
Hose-in-hose, a duplication of the 
corolla, as though a second one 
were inserted in the throat of the 
first. 
Host, a plant which nourishes a para- 
site ; Host-plant, the same. 
Hosto’rium (hostio, I requite, ex Hens- 
slow) = Havstorium. 
hu’mi (Lat.), in or on the ground. 
hu'mifuse, humifu'sus (humus, the 
ground, fusus, spread), spread on 
the surface of the ground ; humi- 
stra’tus (stratus, stretched out), laid 
flat on the soil. 
hu'milis (Lat.), lowly. 
Hu’mor (Lat., moisture) = Sap. 
Hu’mulin, the oleoresin of the hop, 
Humulus Layndus, Linn. 
Hu’mus (Lat., the ground), decom- 
posing organic matter in the soil ; 
~ Plants, = SAPROPHYTES; ~ 
Soils, garden soils enriched with 
organic manure. 
Husk, the outer covering of certain 
fruits or seeds ; hus’ky, abounding 
with or consisting of husks. 
hyacin'thine, hyacin’thus,hyacinth’inus 
(saxivOcvos, hyacinth-coloured) (1) 
dark purplish blue; (2) hyacinth- 
like in habit, a scape bearing 
spicate flowers. 
Hyales’cent, ‘‘somewhat hyaline” 
(Crozier) ; hy’aline, hyali'nus 
(sdAwvos, of glass), colourless or 
translucent; hyalic’olor (color, 
colour), wanting in colour. 
Hy’aloplasm, Hyaloplas’ma (iados, 
crystal or glass, rAdoua, moulded), 
the hyaline matrix or clear and non- 
granular portion of protoplasm ; 
by some restricted to the Ecro- 
PLASM. 
Hyber’nacle,Hyberna’culum = HIBER- 
NACULUM. 
hybernalis = HIBERNALIS. 
Hy'brid, Hyb’rida (Lat., a mongrel), 
a plant obtained by the pollen of 
one species on the stigma of 
another; Hybrid‘ity, Hybrid’itas, 
crossed in parentage ; Hybridiza’- 
tion, (1) the art of obtaining hybrids 
by artificial crossing ; (2) also used 
for the same operation occurring 
naturally. 
Hy dathode (Udwp, water, 640s, a way), 
Haberlandt’s term for water-pore 
or water-gland, an organ which 
extrudes water or other liquid ; it 
resembles a stoma with functionless 
guard-cells ; Hydral’gae (+ Algae) 
=Hypropuytes ; Hydracel’lulose 
(+ Cellulose), see CELLULOSE ; 
Hy’drate, a compound containing a 
definite proportion of water in 
chemical combination ; Hydra’tion, 
the act of becoming chemically 
combined with water ; hydrocar’pic 
(kapros, fruit), used of aquatic 
plants which are fertilized above 
the water, but withdraw the ferti- 
lized flowers below the surface for 
development, as in Vadlisneria ; 
Hydrocel'lulose, see CELLULOSE ; 
Hydroi'd (eléos, like) = TRacHEID 
(Crozier) ; hy’droger (gero, I bear), 
water-bearing, as hydrog’era va'sa, 
threads in a spiral vessel which 
were formerly supposed to convey 
fluid ; hy’drolated, combined with 
the elements of water, by Hydrola’- 
tion ; hy’drolysed (Avovs, a loosing), 
chemically decomposed by taking 
up the elements of water ; Hydro- 
Yysis, the act of being hydrolysed ; 
Hydroleu’cite (+ Lzxvcrtz), Van 
Tieghem’s term for vacuoles in cell- 
sap, which he further subdivides 
into tanniferous ~, oxaliferous ~, 
coloured ~, albuminiferous ~, in 
accordance with their production 
127 
