482 
THALIA— TIGRID A. 
betonf'icnm, has loose spikes of fragrant 
criniBon flowers. Ex. 
THA'LIA. 1—1. (Orchidea:.) [In honor of 
Jolin Tlialius.] 
dealha'ta, (p. Au. 11) spatha 2-flowered ; 
leaves ovale, revolute at the summit ; pani- 
cle white- pulverulent. <S. 
THALIC'TRUM. 12—12. KKanuncvlacea.) 
[From thallo, to flourish.] 
dio'icum, (meadow rue, w-r. M. 2^.) flow- 
ers difficious ; filaments filiform ; leaves 
about 3-temate ; leafets roundish, cordate, 
obtusely lobed, glabrous ; peduncles axilla- 
ry, shorter than the leaves. 1-2 f. j 
pnbes"cen!i, (w. Au. 21.) leafets woolly, 
lobed, margin revolute, finely pubescent 
beneath. 
cornu'ti, (g-y. Ju. 2X-) leaves decompound; 
teafets ovate, obtusely 3-lobed, glaucous be- 
neath, v/ith the nerves scarcely prominent ; 
flowers mostly dioecious; filaments sub- j 
clavate ; fruit sessile, striate. 2-5 f. Wet \ 
grounds. 
clava'tum, (2J[.) leaves glabrous, without 
stipes; flowei's moncecious; filaments cla- 
vate ; pericarp compressed, with a very 
ehort style. <S. 
alpi'n um, a dwarf species. 
TIIAS'TIUiVr. 5—2. (UmbeUiferecE.) [From 
the isle of Tliaspia.J I 
act(Bifo'linm, (Ju. 2^.) leaves gash-biter- 
nate ; segments oval, equally dentate; um- j 
hels sub-verticillate ; lateral ones sterile. 3 
f. Canada. 
atropurpu'rcnm, (p. J. 2X-) radical leaves 
petioled, cordate, undivided; cauline ones 
gash pinnate ; segments 3 to 7, short petio- 
led, ovate, oblong, all cartilaginous-dentate. 
2-3 f. 
THE'A. 12— 1. {Meli(B.\ [A Chinese name.] 
bohe'a, (bohea tea, M. ^ .) flowers 6-petal- 
led ; leaves obloug-oval, rugose. From 
China and Japan. 
''li/'idis, (green tea, flowers 9-petal- 
led; leaves very long-oval. Ex. 
THER"MIA. 10— I. {LeguminosfF.) [From 
thermos, temperature ; a plant of warm cli- 
mates.] 
rhombifo'lia. (y. If.) "leaves ovate-rhom- 
boid, silky-pubescent beneath ; stipules 
leaf-like, round, ovate, oblique, shorter than 
the petiole ; flowers racemed. S. 
THE'SIUM. 5—1. {Mlea^ni.) [From a Greek 
word signifying garland.] 
umbella' turn, (false toad-flax, w. g. J. 2^.) 
erect; leaves oblong ; umbels axillary, 3-5- 
flowered ; peduncles longer than the leaves. 
y-15 i. 
TIILAS'TI. 14—1. (Ciuciferm.) [Yromthlao, 
to break, so called because it appears bro- 
ken.] 
bursa-pasto'ris, (shepherd's-purse, w. M. 
hirsute ; silicles deltoid, obcordate ; rad- 
ical leaves pinnatifid. 
arven"se, (penny-cress, w. J. ©.) leaves 
oblong, sagittate, coarsely toothed, smooth ; 
pouch sub-orbicular, shorter than the pedi- 
cel ; its wings dilated longitudinally ; flow- 
ers in a raceme. 1 f. 
tnhero' ^nm . (A p. 0.) flowers large, rosa- 
'"»wu» ; stem J-5 inches high, simple, pubes- 
cent; upper leaves sessile , radkal leave 
long-petioled ; root tuberous, pouch orbie 
ular. 
(dlia'ceum, (0.) leaves oblong, obtuse 
dentate, glabrous ; silicle sub-ovate, ventri 
cose. Introduced. 
THU'JA. 19—15. (ConifercB.) [From thua* 
odor, so called from its fragrant smell. j 
occidenta'lis, (American arbor-vitae, M 
branches ancipetal; leaves imbricated, 
in 4 rows, ovate-rhomboid al ; strobiles ob- 
ovate. Mountains. A small tree with 
very tough branches. Leaves resembling 
scales. 
gigan"tea, leaves imbricate 4-ways, ovate, 
obtusi.sh, closely incumbent, sub-equal ; 
strobiles loose ; scales oboval, 200 feet high, 
and 12 feet in diameter. 
articnla'ta, produces the gum Sandarach. 
the wood is said to resist fire, and is also 
supposed to be the sandal-wood of the an 
cients. 
THY'MUS. 13—1. (LabiatcE.) 1? x oxn thuma 
odor.] 
vvlga'Hs, (thyme, b-p. J. 14-.) erect ; leaves 
ovate and linear, revolute ; flowers in a 
whorled spike. Ex. 
serpyVlum, (wild thyme, b-p. J. 2J[.) stems 
branched, creeping ; leaves elliptic-ovate 
obtuse, flat, petioled, ciliate at base ; flow- 
ers capitate. 4-8 i. Naturalized. 
Za7m^e«o's7/s, (lemon thyme, 2Ji- ^.)stenj 
creeping, hirsute ; leaves obtuse, villose : 
flowers capitate. Ex. 
grandijlo'ra, very ornamental. Ex. 
TTIY'SANOCAR'TUS. 14-1. {Crucifera.i 
[From thasanos, fringe, and karpos, fruit tlu 
pods having fringe on the edge.] 
curvi'pes, flowers racemed, small ; leavei 
mostly radical, pinnatifid ; silicle pendulous 
stem solitary, erect. West of Ilockv Moun 
tains. 
oblongifo'lius, silicles nearly orbicular 
wingless, hispid, with uncinate hairs ; pe 
tals about half as long as the calyx ; leaves 
oblong, toothed, densely and stellatel^ 
hirsute. Oregon. 
TIAREL"LA. 10—2. (Saxifrages.) [Fron. 
tiara, an ornament for the head.] 
cordifo'lia, (mitre-wort, w. M. 2X-) leaves 
cordate, acutely lobed, dentate; teeth mu- 
cronate ; scape racemed ; petals with lonji 
claws ; flowers in a simple terminal raceme 
Shady woods. 8-10 i. 
menzie'sii, (2^.) leaves ovate, heart-shap 
ed, acute, lobes short, dentate ; caulint 
ones alternate, distant; raceme filiform 
somewhat spiked ; calyx tubular. 1 f. 
trifolia'ta, {11.) leaves tern ate ; leafett 
sub-rhomboid, serrate, pilose ; racemes ter 
minal ; small corj'mbsof flowers alternate • 
calyx campanulate. 
TIGA'REA 11— I. iRoaocecr.) 
tridenta'ta, (y. Ju. '^.) leaves crowded 
towards the ends of the branches, 3-tooth- 
ed, villose above, hoary-tomentose beneath , 
flowers terminal, solitary. S. 
TI'GRIDIA. 15—3. (Iridea:.) [So called frosD 
its RpuUed appeatancf, resembling a tiger.i 
eusi/a/'tnis (tiger flower,) spatha 2-]ea^ 
