weeds of national significance willow identification part 3 – male or female supported by the...
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![Page 1: Weeds of National Significance WILLOW IDENTIFICATION Part 3 – male or female Supported by the State Government of Victoria](https://reader033.vdocument.in/reader033/viewer/2022051821/5697c00f1a28abf838ccab50/html5/thumbnails/1.jpg)
Weeds of National Significance
WILLOW IDENTIFICATION
Part 3 – male or female
Supported by the State Government of Victoria.
![Page 2: Weeds of National Significance WILLOW IDENTIFICATION Part 3 – male or female Supported by the State Government of Victoria](https://reader033.vdocument.in/reader033/viewer/2022051821/5697c00f1a28abf838ccab50/html5/thumbnails/2.jpg)
Only males produce pollenOnly males produce pollen
![Page 3: Weeds of National Significance WILLOW IDENTIFICATION Part 3 – male or female Supported by the State Government of Victoria](https://reader033.vdocument.in/reader033/viewer/2022051821/5697c00f1a28abf838ccab50/html5/thumbnails/3.jpg)
Pollen primarily dispersed by bees or windPollen primarily dispersed by bees or wind
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Only males produce pollenOnly males produce pollen
Several stamens per flower each Several stamens per flower each with a with a bright yellow pollen sackbright yellow pollen sack
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Only males produce pollenOnly males produce pollen
![Page 6: Weeds of National Significance WILLOW IDENTIFICATION Part 3 – male or female Supported by the State Government of Victoria](https://reader033.vdocument.in/reader033/viewer/2022051821/5697c00f1a28abf838ccab50/html5/thumbnails/6.jpg)
Only males produce pollenOnly males produce pollen
![Page 7: Weeds of National Significance WILLOW IDENTIFICATION Part 3 – male or female Supported by the State Government of Victoria](https://reader033.vdocument.in/reader033/viewer/2022051821/5697c00f1a28abf838ccab50/html5/thumbnails/7.jpg)
Females have Females have bulbous greenbulbous green ovaries ovaries
Each with a single stigmaEach with a single stigma
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Females have Females have bulbous greenbulbous green ovaries ovaries
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Females have Females have bulbous green *bulbous green * ovaries ovaries
* May look * May look yellowyellow if water/heat stressed if water/heat stressed* Turns * Turns brownbrown when sheds seed and dries out when sheds seed and dries out
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Females produce seedFemales produce seed
What is happening here?
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Females shed lots of seed!Females shed lots of seed!
Pollinations is likely to occur and seed produced if Pollinations is likely to occur and seed produced if you have:you have:• male and female flowers (within approx. 2km)male and female flowers (within approx. 2km)• same subgenus (trees or shrubs) same subgenus (trees or shrubs) • flowering times overlap flowering times overlap
(varies among taxa from Aug to Nov)(varies among taxa from Aug to Nov)
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Golden Weeping Willow (Salix x sepulcralis var. chrysocoma)
New Zealand hybrid willow (Salix alba x S. matsudana)
Female flowersMale flowers
What is strange about these pictures?
Female flowers Male flowers
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Seed viability?
• One willow can produce thousands of seed each spring
• Must germinate within 1-2 weeks to survive• Can germinate within just 6-8 hours!• Biggest known culprits –
Salix nigra (black willow)
Salix cinerea (grey sallow)