PLANTS AND FERNS. 87 



T. barhinode, N. y. J. % 2—3 ft. Rocky woods. Thapsia 



trifoliata, Sp. 

 Thesium umbellatum, Linn. g-to. J, 21 9 — 12 i. Dry woods. 

 Thlaspi arvense^ Linn. ?t'. J. Fields. 

 T.hursa-pastoris.lAim. w. Ap. 6 — 12 i. Fields. 

 Thymus serpylltim, Linn. Wild Thyme, p. Ju. ^ Fields. 

 TiARELLA cor^Zz/oZtrt, Linn. w. M. ^ 10 — 12 i. Rocky banks. 

 TiLiA glabra, Vent. Bass-wood. y-io. J. k 20 — 40 ft. Woods. 

 T. pubescens, Ait. ?«. J. k 30—40 ft. Woods. 

 Tradescantia virginica, Linn. Spider-wort. b. M. 21 1 — 2 ft. 



Meadows. 

 Trichodium laxijlorum, Mx. M. 21 18 i. Road sides. 

 Trichostema dichotoma, Linn. Blue Curls, b. Ju. 6 — 12 i. 



Sandy fields. 

 Trifolium repens, Linn. White Clover, iv. M. 11 Fields. 

 T. pralense, Linn. Red Clover, r. M. % Fields. 

 T. arvense, Linn. Hare's Foot. r-w. Ju. Dry fields. 

 T. agrarium, Linn. y. J. © 8 — 12 i. Open woods. 

 T. procumbens, Linn. y. J. 3—6 i. Pastures. 

 Trillium erectiim, Linn. False Wake Robin, p. lo. M. :V 6 — 15 i. 



Damp woods. 

 T. grandijlorum, Sal. w. M. 21 12 — 18 i. Rocky meadows. 

 Triosteum perfoUaium, Linn. Fever Root. p. J. J^ 2 — 3 ft. 



Rocky woods. 

 Triticum aestivum, Linn. Wheat. J. (v) 3 — 4 ft. Fields. 

 Tripsacum dactyloides, Linn. Sesame Grass. J. 21 3 — 6 ft. 



Meadows. 

 TussiLAGo/ar/ara, Linn. Colt's-foot. y. Ap. ^ 6 — 10 i. Low 



grounds. 

 TypHA latifoUa, Linn. Cat-tail. Ju. 2/ 4—6 ft. Marshes. 

 Ulmus americana, Linn. White Elm. Ap. I2 40—70 ft. Low 



grounds. 

 V.fuha, Mx. Slippery Elm. Ap. k 20—40 ft. Woods. 

 Uniola spiccr/a, Linn. Au, J/ 12 — I8i. Brackish meadows. 

 Uraspermum claytoni, N. Sweet Cicely, w. J. 21 2 ft. Woods. 

 U. hirsutum, Bw. w. J. 2; 2 ft. Woods. 

 Urtic A ;3wmiZa, Linn. g. Ju. 8— 12 i. Damp places. 

 U. dioica, Linn. Nettle, g. Ju. J/ 2 — 3 ft. Road sides. 

 U. canadensis, Linn. Hemp Nettle, g. Ju. 21 3—6 ft. Damp 



shady places. 

 Utricularia vulgaris, Linn. Bladder- wort. y. J. 2^ 6 — 3 i. 



Water. Ponds. 



