Symphyotrichoid
Asters
in
the
broad
sense
Subtribe
Symphyotrichinae
Nesom
(sensu
Nesom
2000)
includes
x
=
9,
8,
7,
6,
5,
4
and
3
species
of
asters
native
to
North
America.
A
few
species
are
native
to
South
America
and
several
species
are
naturalized
in
Europe
and
scattered
locations
around
the
globe.
This
is
the
largest
group
of
asters
and
the
most
common
throughout
North
America.
These
are
the
asters
with
paniculiform
inflorescences
and
phyllaries
with
a
more
or
less
diamond
shaped
darker
chlorophyllous
zone,
with
considerable
variation
in
degree
of
leafiness
and
size
of
the
chlorophyllous
zone.
Quadruple,
triple,
and
double
pappi
occur
in
the
subtribe
(Semple
&
Hood
2005).
Usually
the
secondary
outer
series
of
short
bristly
scales
is
absent
or
vestigial.
The
secondary
inner
series
of
mid
lenth
attenuate
bristles
is
often
weakly
developed
or
absent.
The
innermost
primary
inner
series
bristles
are
the
longest
and
very
weakly
to
moderately
clavate.
The
Symphyotrichinae
as
first
proposed
by
Nesom
included
a
number
of
genera
not
closely
related
within
the
Tribe
Astereae,
but
Nesom
(2000)
removed
these
and
included
the
following
genera:
Canadanthus
(x=9;
1
sp.);
Ampelaster
(x=9;
1
sp.),
Almutaster
(x=9;
1
sp),
Psilactis
(x=3,4,
9;
6
spp.),
Symphyotrichum
(x=8,
7,
6,
7,5,4;
ca.
90
spp.).
This
has
been
shown
to
be
a
monophyletic
group
by
Brouillet
et
al.
(2001a,
b).
revised
30
January
2014
by
J.C.
Semple
©
2013,
2014
J.C.
Semple,
including
all
photographs
unless
otherwise
indicated
