bterranean origin.

=Suture.= The line of union between parts which have grown together;
most often used with reference to the line along which an ovary opens.

=Terete.= Cylindrical.

=Ternate.= In threes.

=Tomentose.= Densely pubescent or woolly.

=Truncate.= As if cut off at the end.

=Umbel.= An inflorescence in which the flower stems spring from the same
point like the rays of an umbrella.

=Verticillate.= Arranged in a circle round an axis; whorled.

=Villose= or =villous.= With long, soft hairs.

=Whorl.= Arranged in a circle about an axis.

INDEX.

A

Abele. (Populus alba, L.) 39, 40

Abies balsamea, Mill. _Fir balsam_ 20-22

=Abietacae.= (=Pinoideae=) 1-22
Larix 1-4
Pinus 4-12
Picea 12-18
Tsuga 19, 20
Abies 20-22

Acacia, (Robinia Pseudacacia, L.) 131, 132
(Robinia viscosa, Vent.) 132
Three-thorned. (Gleditsia triacanthos, L.) 129, 130

=Aceraceae.= (Maple family). 140-153
Acer barbatum, Michx. _Rock, Sugar, Hard maple, Sugar tree_ 144-146
barbatum, var. nigrum, Sarg. _Black maple_ 146, 147
dasycarpum, Ehrh. _Silver, Soft, White, River maple_ 142-144
Negundo, L. _Box elder, Ash-leaved maple_ 151-153
nigrum, Michx. _Black maple_ 146,147
Pennsylvanicum, L. _Striped maple, Moosewood, Whistlewood_ 149-151
platanoides _Norway maple_ 146
rubrum, L. _Red, Swamp, Soft, White maple_ 140-142
saccharinum, L. _Silver, Soft, White, River maple_ 142-144
saccharinum, Wang. _Rocky Sugar, Hard maple, Sugar tree_ 144-146
saccharinum, var. nigrum, T. and G. _Black maple_ 146, 147
Saccharum, Marsh. _Rock, Sugar, Hard maple, Sugar tree_ 144-146
Saccharum, Marsh., var. barbatum, Trelease 172
Saccharum, Marsh., var. nigrum, Britton. _Black maple_ 146, 147, 172
spicatum, Lam. _Mountain maple_ 148, 149
Negundo aceroides, Moench. _Box elder, Ash-leaved maple_ 151-153
Negundo, Karst, _Box elder, Ash-leaved maple_ 151-153

Ailanthus family. (=Simarubaceae=) 133

Ailanthus, Tree of Heaven, Chinese sumac (Ailanthus glanulosus,
Desf.) 133

Alder, European. (Alnus glutinosa, Medic.) 70

Alnus glutinosa, Medic, _European alder_ 70
Amelanchier Canadensis, Medic. _Shadbush, June-berry_, 116, 117
American elm (Ulmus Americana, L.) 95-97
holly. (Hex opaca, Alt.) 138-146

=Anacardiaceae.= (Sumac fam