298 77. AMENTIFERE. 
tree with suckers. L. not lobed except occasionally the youngest. 
Scales of catkins deeply cut at the end.—Damp woods. T. IV. 
Gray Poplar. E. 
3. P. tremula (L.); 1.-buds glabrous slightly viscous, |. nearly 
round acute serrate glabrous on both sides, young 1. slightly 
downy, stig. 4 erect.—E. B. 1909.—A rather large tree, with 
suckers. Peduncles vertically compressed. Scales of the catkins 
deeply palmately cut. Stig. erect.—Woods. T. III. IV. Aspen. 
4. P. nigra (L.); 1. triangular acuminate serrate glabrous, 
“catkins lax cylindrical, stig. 4 simple spreading.”—E. B. 1910, 
—A large tree without suckers. L. remarkably triangular. Young 
shoots glabrous. Scales of the catkins palmately cut, glabrous.— 
Damp places, river-banks. T. III. Black Poplar. 
Tribe IT. Myricee. 
3. Myrica Linn. 
1. M. Gale (L.); 1. lanceolate broader upwards serrate, st. 
shrubby.—E. B. 562.—Height 3—4 feet. Bushy. Catkins ses- 
sile, erect. Fr. with resinous glands. L. fragrant when bruised.— 
Bogs. Sh. V. Sweet Gale. Bog Myrtle. 
Tribe III. Betulinee. 
4. Betuxa Linn. Birch. 
1. B. alba (L.); 1. rhomboid-triangular doubly serrate abruptly 
acuminate, scales of the fem. catkins 3-lobed, lateral lobes falcate- 
refleced, fr. obovate-elliptical —HE. B. 2198 (upper fig.). B. alba 
Koeh. B. odorata R. xu. 626. B. verrucosa Fries !—L. usually 
glabrous, often covered with resmous spots above, always having 
a manifest tendency to a rhomboidal form. Young shoots mostly 
with resinous tubercles. Stip. ovate-lanceolate, acute, thrice as 
long as broad, circinate ; sides not deflexed. Buds conical. Young 
twigs often very long and pendulous. The catkin-scales distin- 
guish this from the next; the shape of the 1. also is different.— 
Rathercommon. T.IV.V. White Birch. 
2. B. glutinosa (Fries !); 1. rhomboid-ovate or cordate un- 
equally serrate acute, scales of the fem. catkins 3-lobed, lateral 
lobes ascending, fr. broadly obovate——E. B. 2198 (lower fig.). 
B. alba R. xii. 623. B. pubescens Koch.—L. usually glabrous, 
always more or less ovate. Stip. ovate, blunt, twice as long as 
broad; sides deflexed. Buds ovate. Not so elegant a tree as 
the preceding and often little more than a bush. Twigs some- 
times pendulous.—f. B. pubescens (Ehrh.); 1. peduncles and 
young twigs downy—Common. T.IV.V. Common Birch. 
