778 
Thalictrum 
platycarpum Greene, 517 
polycarpum Watson, 517 
polygamum Muhl., 514 
var. macrostylum Robinson, 
514 ; 
Pringlei Wats., 518 
var. reticulatum Rose, 518 
pubigerum Benth., 519 
pubigerum Pringle, 518 
purpurascens J[., 363, 388, 427, 
513, 555) 582 
var. ceriferum Austin, 514 
purpureum Hort., 513 
purpureum Schang., 513 
revolutum DC., 513 
revolutum Lec., 514 
Richardsoniit Gray, 512 
rugosum Pursh, 513 
saxatile Vill., 513 
saxatilis Hort., 513 
sparciflorum Turcz., 512 
speciosum Hort., 513 
INDEX. 
Toxylon pomiferum Raf., 71, 84, 87, 
93, 130, 131, 132, 133 
Tradescantia, 54 
reflexa Raf., 377 
virginiana L., 377 
| Triadenum virginicum (L.) Raf., 586 
| Trifolium hybridum L., 393 
tomentellum Robinson & Seat., | 
521 
venulosum Trelease, 516 
Wrightii Gray, 517, 522 
Thelocarpon prasinellum Nyl., 
228, 274, 306, 327 
Theloschistes, 672 
concolor (Dicks.) Tuck., 13, 238, 
302, 304, 309, 668, 670, 685 
var. effusa Tuck., 310, 670, 
685 
18, 
chrysopthalmus (L.) Norm., 302, | 
305, 309, 670, 675, 685 
lychneus (Nyl.) Tuck., 13, 244, 
292, 300, 302, 309, 666, 670, 685 
polycarpus (Ebrh.) Tuck., 244, | 
302, 394, 309, 670, 671, 685 
Thlaspi arvense L., 191, 582 
Thuidium, 36 
abietinum Sch., 49 
philiberti Limpr., 49 
recognitum Lindb., 49 
Thuja occidentalis L., 225 
Thymeleacez, 398 
Tilia, 429, 565, 566 
americana L., 363, 366, 396, 428, 
430, 586 
Tiliaceze, 396, 586 
pratense, 622, 627 
repens L., 393, 541, 622 
Triglochin maritima L., 572 
Trillium cernuum L,., 363, 378 
erectum L,., 363, 378 
Triosteum perfoliatum L., 363, 408 
Triphragmium Link., 537, 554 
clavellosum Berk., 554 
Triticum vulgare L., 548 
Typha latifolia L., 373, 626, 624 
Typhacee, 373 
Uimacez, 70, 89, 383 
Ulmus, 85, 324 
americana L,., 70, 87, 89, 130, 132, 
133, 358, 363, 383 
fulva Michx., 70, 363, 383, 629 
racemosa Thomas, 383 
Ulota crispa Brid., 41 
curvifolia Brid., 41 
hutchinsiae Sch., 41 
Ulotrichiaceae (Kg.) Borzi, 26 
Umbelliferze, 89, 399,.588 
Umbilicaria, 4, 5, 6, 221, 236, 
662 
dillenii Tuck., 3, 14, 249 
hyperborea Hoffm., 228, 250 
muhlenbergii (Ach.) Tuck., 222, 
pustulata (L.) Hoffm. var. papu- 
losa Tuck., 224, 250 
vellea (L.) Nyl., 233, 249 
282 
, 
: Uncinula, 424 
clintonii Peck, 428 
necator (Schw.) Burrill, 429 
salicis (DC. ) Wint., 428 
| Unifolium canadense (Desf.) Greene, 
378, 577 
| Urceolaria, 657 
actinostoma Pers., 281, 282, 287, 
288, 320 
scruposa (L.) Nyl., 16, 223, 224, 
263, 286, 293, 296, 301, 320, 668, 
696 
