182 T R I 



late, cilitate serrate; peduncles 1-flowered, incrassate; sub-inflated; 

 calyx angled. 



172. TANACETUM. 



Exotic. 



Vulga're, (tansey. y. Ju. 1}-) leaves doubly pinnate, gash-serrate. Na- 

 turalized. Var. crispum, (double tansey,) leaves crisped and dense. 



131. TEUCRIUM. (From Teucer, a Trojan prince.) 



Canaden"se, (wood sage, germander. O. r. Ju. 9^) pubescent ; leaves 

 lance-ovate, serrate, petioled ; stem erect; spikes whorled, crowded; 

 bracts longer than the calyx. Var. virginicum, upper leaves sub- 

 sessile ; bracts about the length of the calyx. 1 3. f. 



131. THYMUS. (From tftumos, force.) 

 Exotic. 



Vulga'ris, (thyme, b-p. J. 1J-, I?) erect ; leaves ovate and linear, revo- 

 lute ; flowers in a whorled spike. 



61. TRADESCANTIA. (From Tradescant, a botanist.) 



Virgini'ca, (spider wort. b-p. M. 1|_) erect, branching ; leaves lanceo- 

 late, elongated, glabrous- flowers sessile; umbel-compact pubescent. 

 Cultivated. 12. f. 



1G 10. TRIFOLIUM. (From tres, 3, and. folium, a leaf.) 



Re' pens, (while clover. O. w. M. 7|.) creeping; leafets ovate-oblong, 

 emarginate, serrulate; flower in umbelled heads; teeth of the calyx 

 sub-equal ; legumes 4-seeded. 



Pratcn"se, (red clover. O. r. M. Ij.) ascending, smoothish, leafet ovate, 

 sub-entire ; stipules awned ; spikes dense-ovate ; lower tooth of the 

 calyx shorter than the tube of the corolla, and longer than the other 

 teeth. 23. f. 



63. TRILLIUM. (From trilix, triple.) 



Ere&"tum, (false wake robin. O. p. w-y. '2J.) peduncles erect or ereclish, 

 with the flowers a little nodding ; petals ovate, acuminate, spreading ; 

 equalling the calyx ; leaves rhomboid, acuminate, sessile. Var. atro- 

 purpureum, petals large, dark purple. Var. album, petals smaller, 

 white ; germ red. Var. flavum, petals yellow ; both petals and calyx 

 leaves longer and narrower. 12 to 18 "inches high. Leaves often 3 

 to 4 inches broad. Peduncles about 3 inches long. 9 16. i. 



32. TRITICUM. (From tero, to beat or thresh.) 



Exotic. 



Hyber"num, (winter wheat. J. J 1 ) calyx glume 4-flowered, tumid, even 

 imbricate, abrupt, with a short compressed point ; stipule jagged ; co- 

 rollas of the upper florets somewhat bearded. There are severti] 

 varieties of this species which are introduced by culture. 



