POPITLTTS. BETT7IA. 317 



2. Vap'viAJS Linn. Poplar. ■ 



1. P. ana (L.) ; l.-buds downy, 1. roimdisli-cordate angularly- 

 toothed cottony and snowy white beneath, 1. of the young shoots 

 cordate palmately 5-lobed, stig, 2 linear Ufld erosslihe (yellow). 

 — :With suckers. L. generally lobed. Male catkin-scales hairy. 

 —Damp woods. T. III. IV. White Poplar. Ahele. E. S. 



2. P. canes'cens (Sm.) ; l.-biids downy not viscous, 1. roundish 

 obscurely lobed sparingly cottony and gray beneath, 1. of young 

 shoots cordate-ovate undivided, siiV/. 2 wedgeshnped 3 — 'k-lobed 

 (purple). — With suckers. L. not lobed, except occasionally the 

 voungest. Male catkin-scales hairy. — Damp woods. T. UI. 

 IV. Qray Poplar. E. 



3. P. trem'id-a (L.) ; l.-buds glabrous slightly viscous^ 1. nearly 

 round acute serrate glabrous on both sides, young 1. slightly downy, 

 stig. 2 bifid erect. — A small tree; with suckers. Petioles late- 

 rally compressed. Male catkin-scales hairy, palmately cut.^ 

 Woods. T. IV. Aspe?i. E. S. I. 



4. P. nigra (L.) ; L-huds glabrous viscous, 1. triangular-rhom- 

 boidal acuminate sevraie glabrous o» 6o<A si&s, catkins lax cylin- 

 drical, stig. 2 roundish 2-lobed.^A large tree, without suckers. 

 Petioles laterally compressed. Young shoots glabrous.' Male 

 catkin-scales glabtous. — Damp places and river-bainks. T. III. 

 Black Poplar. ' E. 



Tribe II. Myricem. 



3. Mtki'ca Linn. Sweet Gale. 



1. M. GSe (L.) ; 1. lanceolate broader upwards serrate, st. 

 shrubby. — Height 3 — 4' feet. Bushy. 'Catkins sessile, erect. 

 Fr. with resinous glands. L. fragrant when bruised. — ^Bogs. 

 Sh. V. E.S.I. 



Tribe III. Seiulineee. 



4. Bei'0la Linn.' Bircli. 



1. S. verrucdsa (Ehrh.) ; 1. rhomboid-triangular doubly ser- 

 rate abruptly acumina^, scales of the fern, catkins 3-Iobed, 

 lateral lobes falcate-reflexedjii: obovate. — ^Fl. Dan'. 2549. S. alba 

 Koch. B. odorata R. xii. 626. — L. usually glabrous often covered 

 with resinous spots a,bqve, always having a manifest tendency 

 to a rhomboidal form, flat beneath with raised veins above. 

 Young shoots mostly with resinous tubercles, often very long 

 and pendulous. Stipj ovate-lanceolate, acute, thrice as long as 

 broad, circinate; sides not deflexed. Buds conical. The cation- 



