LYONOTHAMNEAE, A NEW TRIBE IN THE ROSACEAE (ROSALES)

2008·2.4 MB·English

by  Luc Brouillet

NEW
LYONOTHAMNEAE, A
THE ROSACEAE
TRIBE
IN
(ROSALES)
Luc
Brouillet
notably the Potter (2007) paper, have changes
e, et al. led to in the
Molecular
phylogenetic analyses angiosperms more
of the and, of Rosidae Tahkht. (summarized
specifically, in
Angiosperm Group
Phylogeny and Morgan
2003) Rosaceae 1994) have changed
Juss. substantially
(e.g., et
al.
our perception of the relationships of Rosaceae, and have changes
resulted in slight to circumscription.
its
&
now
Traditional Rosales Bercht. Presl Cronquist 1981) included families that are dispersed
(e.g., in
J.
many
and now
orders subclasses (Angiosperm Phylogeny Group
2003). Rosales has circumscription
a that
&
members
includes former Rhamnales Linnk and
of the ex
Urticales Bercht. (Angiosperm
Juss. Presl
J.
Phylogeny Group new
2003). Similarly, phylogenetic analyses have led to a classification of the Rosaceae
with
(Potter et al. 2007), a reorganization of subfamilies and, to a lesser extent, tribes. Hypotheses of rela-
among
and
tionships tribes subfamilies were considerably modified One may
also as a result of this analysis.
compare, Kalkman
for instance, the traditional classification used by (2004)
to that of Potter (2007):
et
al.
the classic subfamilies Spiraeoideae Arm, Rosoideae Arm, Prunoideae Horan., and Maloideae Weber,
rec-
ognized were
in the former, reduced three in the Rosoideae, Dryadoideae and
to Sweet,
latter, Spiraeoideae.
now
The
subfamily
last incorporates genera formerly included in three subfamilies, including Prunoideae
and
Maloideae. In the phylogenetic analysis of Potter et (2007), Lyonothamnus A. Gray appeared the
al. at
members
base
of Spiraeoideae, sister to all other of the clade. In their classification, Lyonothamnus was not
assigned Lyonothamnus has been
to a tribe. Historically, considered part of tribe Quillajeae Endl., along with
now
Don
Quillaja Molina. Quillaja is treated as the only genus in Quillajaceae D. of the Fabales Bromhead
(Angiosperm Group
Phylogeny The and
2003). subfamilial
tribal classification of Potter (2007) be-
et
al. is
used
ing as the basis for treating Rosaceae in the Flora of North America project (volume Rosales
in
part).
9,
name
no am
Currently, tribal exists for Lyonothamnus (Pankhurst 2007; Reveal 2006). Therefore, proposing
I
the creation Lyonothamneae, accomodate
of a tribe, to Lyonothamnus.
Lyonothamneae
nOV
Tribus
Brouillet, tribus
Lyonothamnus Amer.
Type: A. Gray, Proc. Acad. Arts 20:291. 1885.
mple compound;
or caducous,
stipules
free;
\
Journal of the Botanical Research Institute of Texas 2(1)
386
hypanthium campanulate; torus none; carpels distinct,
2(-3),
perigynous; epicalyx of (l-)2-3 bractlets;
2-4
more, Fruits aggregated (follicetum), styles
ovules or clustered. follicles
terminal, distinct;
styles
free,
x =
tardily
falling, 9.
)hn Strother for their helpful
c<
Angiosperm Phylogeny Group the orders
An update of the classification for
2003.
Angiosperm Phylogeny Group.
APG Soc
:399-436.
and 141
families of flowering plants: Bot. Linn.
J.
II.
New
Columbia
An system of of flowering plants. University Press,
AJ. 1981. integrated classification
Cronquist,
York.
Flowering Dicotyledons: Celastrales, Oxalidales, Rosales,
Kalkman, 2004. Rosaceae. Kubitzki, ed. plants.
C. In: K.
The and genera of vascular plants. Berlin. Pp.
Comales, families
Kubitzki, series ed.,
Ericales. Vol. VI in K.
343-386.
sequence
Morgan and 1994. Systematic and evolutionary implications of rbci
Robertson.
D.R., D.E. Soltis, K.R.
Amer. :890-903.
variation Rosaceae. Bot. 81
in
J.
Orga-
Lyonothamnus. Rosaceae database. Provisional global plant checklist. International
2007.
Pankhurst,
In:
R.
[http://bgbm3.bgbm.fu-berlin.de/iopi/gpc/PTaxonDetail.asp7NameCa
nization for Plant Information (DPI).
che=Lyonothamnus&PTRefFk=1 8 (accessed Oct. 2007)].
2,
TA
M.
Morgan, M. Robertson, Arsenault, Dick-
Potter, D.,T Eriksson, R.C. Evans, S.-H. Oh, J.E.E. Smedmark, D.R. Kerr, K.R.
266:5-43.
and Campbell 2007. Phylogeny and classification of Rosaceae. PL Syst Evol.
inson, C.S.
nominum supragenericorum plantarum vascularium. [http://www.pl a nt-
2007. Rosaceae. Indices
Reveal, J.L In:
systematics.org/reveal/pbio/fam/famRS.html (accessed Dec. 2007)].
1 1,