gether. Pollen in 5 cases. Ovules 2. Leaves linear, in 2 ranks, de-
cicIuoLis in the only species yet introduced.
Run i'p eru s. Mide catkins terminal, female ones axillary, few. Pollen in
3 to 0 cases. Ovule one. Fruit pulpy. Leaves opposite or ternate, rigid.
G e n u s V I I I .
7’H U 'JA L. T h e A r b o r V itæ . Lin. Syd. Monoe'cia Monadélphi
Ucnt,ficat,on. UI Io— . Gen., .1„0-t7o8 .; J»u ss., 4 13. ; _L aitil). Pin. ^
A * '- " lio Vie. F r. ; L o b en sb aum , .
iinnsi ftei™ad oVf -m op°n™.iif » in aanvificQt. u r il,o. . c! o. n s efqru e n11c_ e.1 O•f ,thi
ed. 2., 2.
" i n i t o i tef lOTSÓe‘i« [;ÌrìÒ 0S " '" ^ i ; ) Ì Ó S S t a d o - d
Gen. Char Male flowers m a terminal solitary catkin. Pollen o f each flower
included m 4 cases, that are attached to the inner face o fth e scale, towards
Its h r e . — Iemale flower in terminal catkins. Ooanj connate with the
biactea; the two conjoined may be termed a receptacle. Ovules 2 to each
receptacle Receptacles se.ni-peltate, imbricated, smooth, or, in some, h aviY
"fo’’®"’ ®*- "fo°®"-
A frira ^Y T ìv o evergreen ; or large fastigiate shrubs ; natives of Asia,
Ahica, and INoith Amenca, and for the most part hardy in British gardens
tT Y s - - f r ‘“ ‘‘fo®’’®®" " “'“ ‘"fo by Professor Don into the fo llow in g s? :
1. Thùja:/ree Cones oblong-compressed ; scales consisting o f a definite
number (4 or 6), coriaceous, smooth, with one tubercle under the
wffiYd T "te®""®"®" ®bo"®n®d, boat-shaped. Seeds compressed,
te ® ; belong T. occidentàlis L., T. plicàta Donn, and T
chilensis D. Don In T. occidentàlis the seeds are flattened, win"ed
all round, emarginate at the apex. wm„ea
"■ scales indefinite in number, peltate,
TY rfén tà fe i ® }‘"®’ ®r"sra®eous, without wings. To this belongs
111. Clarissa. Cones roundish ; scales indefinite in number, peltate, woody
pensilis D . Don, and 7\ pendula Df.o D‘® on. '''■ «ipressoìdes-L., T.
§ i. T/wjec vera;.
Î 1. Ï'. OCCIDENTA'LIS L. The Western, or American, Arbor Vitæ.
SiS SnteSIf: “‘tea te Amer. tSey-l:.," 3-. i
t e i r S " - "■ " ' 't o P“» " of 'to s tree in Arb. Brit., 1st edit., vol. vlIl. ; and e u r
Spec. Clm., f r . Branchlets 2-edged. Leaves imbricated in 4 rows ovate
rhomboid, adpressed, naked, tuberculated. Cones obovate ; interior s ? es'
runcate, gibbous beneath the apex. (Willd.) A moderate-sized e ? ,g !e e n
toee or large shrub. Canada. Height 40 ft. to SO ft. In cultivatim fe
S Y g O T Y m f f o ^fo"®'-fo® ‘■‘P®"‘"i^ ft® co"®s in"t?
Variety.
i T. o. 2 variegàta Marsh, p. 243. T. o. foliis variegatis Lodd. Cat.
1836.—Leaves variegated.
The frondose-like foliage is numerously ramified, and flattened, or spread
out laterally. The leaves are small, opposite, imbricated scales : when bruised,
they diffuse a strong aromatic odour. The sexes are separate upon the same
tree. The male catkins are in the form of small cones, which, when ripe, are
yellowish, about 4 lines in length, and composed of oblong scales, which open
throughout their whole length for the escape of several minute seeds, each of
1991. T . occidentàlis.
which is surmounted by a short wing. Compared with the Oriental, o r Chinese,
arbor vitæ, the American species is a loose irregular-headed tree, with the
branches much more horizontal than in that species. The rate of growth, in
the climate of London, is from 6 in. to 1 ft. in a year. In ten years, in favourable
soils, it will attain the height of 10 or 12 feet ; and in 30 or 40 years,
in moist sheltered situations, drawn up by other trees, it will attain the height
of 30 or 40 feet. The most common use of this tree in America is for rural
fences, for which it is highly esteemed. The posts last 35 or 40 years, and
the rails 60 years ; or three or four times as long as those of any other species.
The posts remain undecayed twice as long in argillaceous as in sandy soils.
In Britain, the American arbor vitæ can only be considered as an ornamental
siirub or low tree ; thriving well in any soil, even in the most exposed situations,
but attaining its largest size in low, sheltered, and moist places. It
grows mucli faster than the oriental arbor vitæ, bears the knife and the shears,
and is frequently employed to form hedges for shelter in gardens and nursery
grounds. Readily propagated by seeds, which are procured in abundance from
America or gathered from British trees, or b j cuttings.
1 it 2. T. (o.) p l i c a ' t a Donn. The plicate, or Nee’s, Ai'bor Vitæ.
Identification. Donn Hort. Cantab., 6. p. 249. ; Lamb. Pin., ed. 2., 2. No. 61.
Engraving. Our Jig. 2108.in p. 1110.
Spec. Char., f r . Branchlets compressed, spreading. Leaves rhomboid-ovate,
acute, adpressed, imbricated in 4 rows, naked, tubercled in the middle.
Cones oblong, nodding. Seeds obcordate. (Lamb. Pin.) A tree resembling
the preceding .species, but smaller. Mexico, and the western shores of