Fraxinus- Ash Flashcards

1
Q

Fraxinus

A

Ash

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2
Q

Faxinus pennsylvanica var. subinteggerima

A

green ash

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3
Q

Fraxinus nigra

A

Black ash

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4
Q

Fraxinus mandshurica

A

Manchurian Ash

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5
Q

Fraxinus americana

A

White ash

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6
Q

Green ash characteristics

A

conical-upright oval grown
open (not dense)
single trunked
medium to high headed (good street tree)
mature- more cylindrical

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7
Q

Green Ash Buds

A

opposite buds
terminal buds (yellow) are scaly, dark rusty brown*
Sparsely pubescent (hairy)
terminal buds often flattened and much larger than axillary buds (red) which tend to be rounded
very little space between terminal bud and axillary buds

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8
Q

Green Ash- leaves

A

(good identifier)
Compound leaf- odd pinnate, 5-7 leaflets*
end leaflet (yellow) largest in size
serrate margins
petiolule leaflet attachment

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9
Q

Petiole

A

is the stalk that holds the leaves/leaflets

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10
Q

Petiolule (if present)

A

is the stalk that holds the leaflets (only on compound leaves)

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11
Q

Rachis

A

the continuation of the petiole inside a compound leaf

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12
Q

Sessile

A

means no petiolule- leaflet attached directly to petiole

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13
Q

Green Ash Flower

A

dioecious; male flowers and female flowers on different trees
female flowers: more green, rugged and thick, can be prolific seed producers
flowers commonly appear before leaves

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14
Q

Green ash fruit

A

Samara
wings are long, straight sided and thin; like a canoe paddle*

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15
Q

Benefits of Dioecious trees in landscaping

A

Gravitate towards the males so there is less seeds dropping

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16
Q

Green Ash- autumn colouration

A

golden-yellow
usually the last to get leaves in spring and the first to drop leaves in autumn (negative feature)

17
Q

Green Ash Bark

A

ashy, textured
non-descript

18
Q

Green ash cultivars

A

mostly tall, more narrow upright trees
Foothills Green Ash (male,seedless)
Patmore Green Ash
Prairie Spire Green Ash
Bergeson Green Ash

19
Q

Green Ash Pest

A

Most common: Ash flower gall mite (only affects male trees), ash plant bug, ash cone roller
Emerald ash borer (not yet in SK)

20
Q

Ash flower gall mite

A

mostly/only on male trees
mite attacks male flowers, causing them to form into a gall; retained for years
not overly harmful; cosmetic problem
“Tree broccoli” hang on for a long time

21
Q

Ash plant bug

A

nymphs live on underside of leaf
piercing action causes speckled look
behaves like an aphid

22
Q

Ash cone roller

A

rolls leaf
makes cocoons
not likely to kill tree
strange expression on tree; cosmetic

23
Q

Fraxinus nigra

24
Q

Black ash characteristics

A

Leaves look a little droopy, because of the length of the compound leaf
more columnar shape
prefer wetter sites
yellow/golden fall colour

25
Black ash- cultivar/hybrid
cultivar most common 'Fall Gold' hybrids are more commonly planted- 'Northern Treasure Ash' (male), 'Northern Gem' (male)
26
Black Ash- bud
axillary buds round dark brown to black often a small space between terminal bud and axillary buds
27
Black Ash- Leaf
Rounded to broadly acute at base tapered from well above the middle to a slender tip 7-11 leaflets (most commonly 9) leaflets sessile brown hairs at base of leaflet
28
Fraxinus mandshurica
manchurian ash
29
Manchurian ash- characteristics
ornamental leaves longer than other ash; leaves droop more than black ash
30
Manchurian Ash- leaf
largest number of leaflets (9-13) hence why they droop leaflets sub-sessile (very short petiolule) rusty hairs at base of leaflets serrate leaf margins rusty brown hairs along veins and at axils rachis and petiole can be slightly winged (cannot roll between fingers)
31
Manchurian ash- bud
axillary buds rounded dark brown to black very little space between terminal bud and axillary buds stems often two sided rather than rounded
32
Manchurian Ash-bark
bark is golden colour
33
Manchurian Ash- cultivar
Faxinus mandshurica "Mancana": fairly common front yard tree medium sized tree- showy nice round shape
34
Manchurian Ash- pest
cottony ash psyllid, "jumping tree lice", not on green ash
35
Cotton Ash psyllid
black and manchurian ash and hybrids are particularly affected. devastating for trees nymphs enter leaves like a leaf miner-difficult to spray or control death of trees is very common
36