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PLSC 330 > Populus- poplar > Flashcards

Populus- poplar Flashcards

1
Q

Populus

A

poplar; aspen; cottonwood

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2
Q

Populus

A

some of the most common and widely distributed native trees in Canada
40 species, 6 native to Canada
Freely hybridize
also introduced species
variable in size
can be very large trees

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3
Q

Populus- leaves

A

huge variation in leaf size and shape
variable serrations
simple leaves
pinnate venation
most have long petioles

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4
Q

populus- flowers

A

dioecious
male and female flowers borne on seperate plants
flowers usually appear before or with the leaves

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5
Q

Populus- fruit

A

fruit is a fleshy capsule/pod that splits and releases tiny seeds bearing white fluffy hairs that assist them to become airborne
cottonwoods known for fuzzies

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6
Q

Populus- catkin

A

shed bud scales and male catkins can be messy; and can be very sticky- especially balsam poplar

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7
Q

Populus- roots

A

most poplars are shallow rooted
and suckering- especially after a heavy prune or disturbance of the root system

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8
Q

populus alba

A

silver poplar

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9
Q

Populus tremuloides

A

trembling aspen

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10
Q

Populus tremula ‘Erecta’

A

Swedish Columnar Aspen

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11
Q

Populus x canescens ‘Tower’

A

Tower poplar

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12
Q

Populus balsamifera

A

balsam poplar

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13
Q

Populus deltoides

A

Plains Cottonwood

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14
Q

Silver Poplar

A

Round headed tree but columnar forms available

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15
Q

Silver poplar- leaves

A

Simple
ovate to elliptic-oblong
usually 3 to 5 lobed with triangular coarsely toothed lobes
acute leaf tip
subcoardate or rounded at base
‘maple-like’ looking leaf
petioles 2.5 cm long and silver hairy
shiny dark green above
white hairy below

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16
Q

Silver poplar- buds

A

buds are silvery hairy
alternate
new growth intensely silvery hairy
shiny dark green above
white hairy below

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17
Q

Silver poplar- bark

A

numerous lenticels on year-old and older branches
goes from silvery to greenish brown with oldest bark being dark grayish and furrowed
most commonly multi-trunked but can be single trunked

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18
Q

Silver poplar- autumn colouration

A

Autumn colouration is most commonly yellow
some leaves stay silver well into winter

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19
Q

populus tremuloides

A

trembling aspen

20
Q

trembling aspen

A

native to all parts of sask
commonly called native white poplar becuase of the white bark
thicket forming due to suckering action
small, rounded headed tree usually single trunk

21
Q

trembling aspen leaves

A

simple, nearly circular
acuminate leaf tip
rounded at the base
petiole usually longer than the leaf, slender, flattened
slightest air movement will cause leaves to “tremble”
fine irregular serration on the margin

22
Q

trembling aspen- bark

A

bark becomes grey and furrowed with age
can be quite white and is often confused with paper birch
poplar bark does not peel and reproductive structures are very different

23
Q

trembling aspen- autumn colour

A

bright yellow typically- can have leaves which turn red/orange
colour is environmentally modified- 2 factors, moisture, altitude

24
Q

Trembling aspen- pest

A

very prone to attack from poplar borer
larvae burrowing around inside the trunk- chew through xylem which disrupts flow of water
causes death to the top of the tree, and eventually death of whole tree

25
Q

Trembling aspen- ID note

A

sawdust being pushed out of trunk
sap oozing from trunk
holes in trunk

26
Q

Trembling aspen- yellow-bellied sapsucker

A

creates a pattern of small holes
can cause larger holes into the wood

27
Q

The worlds largest tree

A

trembling aspen
Pando is in fishlake national forest in utah south central utah
est. 48k suckers (clones)
originating from a single male tree after the last ice age (9000 years ago)
Pando spans 106 acres and weighs over 13.2 million pounds

28
Q

Populus tremula ‘Erecta’

A

Swedish columnar aspen

29
Q

Swedish columnar aspen

A

very columnar (3-5 feet/1-1.5 m wide)
growth is held close to the trunk

30
Q

Swedish columnar aspen-leaves

A

Simple, ovate, crenate (rounded shallow teeth)

31
Q

Swedish columnar aspen- buds

A

Alternate; slender, conical, sharp pointed, dark reddish-brown; tips curving inwards.
not gummy or fragnant
multiple overlapping bud scales

32
Q

Swedish columnar aspen- pest

A

poplar borer
chew through xylem which disrupts flow of water, causing death to the top of the tree and eventually death of whole tree
woodpeckers can be beneficial

33
Q

Populus x canescens ‘Tower’

A

Tower poplar

34
Q

Tower poplar

A

narrow columnar tree
not as narrow as Swedish columnar aspen

35
Q

Tower poplar- leaves

A

simple, ovate, crenate (rounded shallow teeth)
silvery bottom

36
Q

Tower poplar- autumn co,ouration

A

often yellow

37
Q

Populus balsamifera

A

Balsam poplar

38
Q

Balsam poplar

A

native

39
Q

Balsam poplar- leaves

A

simple; ovate- lanceolate to broadly ovate-deltoid
slight serrate margin
acute or acuminate leaf tip
rounded or subcordate at base
long round slender petioles 3-6 cm

40
Q

Balsam poplar-bud

A

buds slender
long pointed, not angled
very resinous
fragrant
reddish-brown
lateral buds smaller than terminal and pressed against the twig

41
Q

Populus deltoides

A

plains cottonwood

42
Q

plains cottonwood- leaves

A

simple; alternate; shiny
deltoid-ovate to broad-ovate
acuminate leaf tip
subcordate to square at base
petioles somewhat angular or flattened
leathery leaf
coarsely crenate with curved rounded teeth
tip and base of leaf entire

43
Q

plains cottonwood- female

A

known for the large amount of seed they produce- fuzzies

44
Q

plains cottonwood- self pruning

A

tree drops small twigs/ branches after storng winds

45
Q

Plains cottonwood- hybrids

A

variable shapes and sizes
resulting from many different crosses
variable leaf shape, serration, size

PLSC 330 (21 decks)

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