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Dear All, July 24, 2015
In case anyone reads such posts, I now think that pollen starts =
shedding just as or slightly before the stigma starts to extend beyond =
the tube of fused anthers. A small mound of pollen forms at the top of =
the anther tube and is soon joined by a pollen coated stigma.
The green bee (Agapostemon virescens) [thanks for the help Phil], =
abundant on a 5' x 15' patch of Knapweed and seen only there until =
yesterday, has begun to move to other plants such as Leontodon =
autumnalis [one early plant in bloom) and Plantago lanceolata which has =
been in blossom nearby for weeks but ignored. Meanwhile some 10 other =
bee species have become less infrequent on Knapweed.
----- Original Message -----=20
From: "David & Alison Webster" <dwebster@glinx.com>
To: <NatureNS@chebucto.ns.ca>
Sent: Saturday, July 11, 2015 9:19 PM
Subject: Knapweed
> Dear All, July 11, 2015
> I just took a look at a Knapweed floret. Based on a thumbnail =
dissection & a 6X hand lens Bees must work for every grain if they get =
pollen from this plant. Or perhaps by the time the stigma is exposed it =
has already shed.=20
> There appear to be 5 free filaments but the anthers are fused to form =
a tube > around the style.
> Bees working this yesterday were loaded with pollen so I am =
guessing=20
> that pollen is shed just as or just before the anthers emerge from the =
> corolla tube and before the stigma is exposed beyond the anther tube.
> Yt, Dave Webster, Kentville=20
>
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<DIV>Dear All, =20
July 24, =
2015</DIV>
<DIV> In case anyone reads such posts, I now think =
that pollen=20
starts shedding just as or slightly before the stigma starts =
to extend=20
beyond the tube of fused anthers. A small mound of pollen forms at the =
top of=20
the anther tube and is soon joined by a pollen coated stigma.</DIV>
<DIV> The green bee (Agapostemon virescens) [thanks =
for the=20
help Phil], abundant on a 5' x 15' patch of Knapweed and seen only there =
until=20
yesterday, has begun to move to other plants such as <EM>Leontodon =
autumnalis=20
</EM>[one early plant in bloom) and <EM>Plantago lanceolata </EM>which =
has been=20
in blossom nearby for weeks but ignored. Meanwhile some 10 other bee =
species=20
have become less infrequent on Knapweed.</DIV>
<DIV>----- Original Message -----=20
<DIV>From: "David & Alison Webster" <<A=20
href=3D"mailto:dwebster@glinx.com">dwebster@glinx.com</A>></DIV>
<DIV>To: <<A=20
href=3D"mailto:NatureNS@chebucto.ns.ca">NatureNS@chebucto.ns.ca</A>></=
DIV>
<DIV>Sent: Saturday, July 11, 2015 9:19 PM</DIV>
<DIV>Subject: Knapweed</DIV></DIV>
<DIV><BR></DIV>> Dear=20
All, &nb=
sp; &nbs=
p; =20
July 11, 2015<BR>> I just took a look at a Knapweed =
floret.=20
Based on a thumbnail dissection & a 6X hand lens Bees must =
work for=20
every grain if they get pollen from this plant. Or perhaps by the =
time the=20
stigma is exposed it has already shed. <BR>> There appear to be 5 =
free=20
filaments but the anthers are fused to form a tube > around the=20
style.<BR>> Bees working this yesterday were loaded =
with=20
pollen so I am guessing <BR>> that pollen is shed just as or just =
before the=20
anthers emerge from the <BR>> corolla tube and before the stigma is =
exposed=20
beyond the anther tube.<BR>> Yt, Dave Webster, Kentville=20
<BR>></BODY></HTML>
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