Agriculture Reference
In-Depth Information
Tab l e 1 . 6
Known nodulating members of tribes Swartzieae and Sophoreae
Tribe Genus
Species
Nod.
Swartzieae
Ateleia
(DC) Benth.
20
5
Bobgunnia
J.H. Kirkbr. & Wiersema
2
1
Cyathostegia
(Benth.) Schery
1
1
Swartzia
Schreb.
∼
180
27
Sophoreae
Acosmium
Schott.
17
3
Baphia
Afzel. ex Lodd.
47
7
Bolusanthus
Harms
1
1
Bowdichia
Kunth.
2
2
Cadia
Forssk.
1
7
2
Calia
Berland.
4
2
Clathrotropis
(Benth.) Harms
6
3
Diplotropis
Benth.
12
4
Maakia
Rupr.
∼
8
1
Ormosia
G. Jacks.
∼
130
26
Pericopsis
Thwaites
4
3
Sophora
L.
∼
50
15
1
Boatwright et al. (2008a) suggest that this genus might be better placed in tribe
Podalyrieae.
branch of the tribe, which may eventually become the tribe in its entirety. Since the
last two of these genera are segregates from
Swartzia
, and since evidence for
Bocoa
is
equivocal (Sprent, 2001), more observations are urgently needed to see if this branch
is a nodulating one, a suggestion that is strongly supported by the detailed analysis of
Torke and Schaal (2008), who placed these genera, plus
Fairchildia panamensis
(formerly
Swartzia panamensis
, with no record of its nodulation) in a core Swartzioid clade. In
Ireland (2005) the non-nodulating genera together with the unknown ones
Holocalyx
and
Lecointea
form three separate groups interspersed among parts of the Sophoreae.
Tribe Sophoreae is also in a rather chaotic state and has been known for many years
not to be monophyletic. In Pennington et al. (2005) it has 45 genera, 12 of which are
known to nodulate (Table 1.6). Of the remainder, 12 (67 spp.) probably cannot nodulate
and 21 (40 spp.) have no or unconfirmed reports.
The whole situation in tribes Sophoreae and Swartzieae is confused by the fact that
both have genera with and without the 50kb inversion of the chloroplast genome.
Considering the genera that do not have this inversion, there are four small groups
of Sophoreae, a group of Swartzioid genera and tribe Dipterygeae, all of which ap-
pear unable to nodulate. Separate from these, but also lacking the inversion, is the
group of nodulated Swartzioid genera mentioned above. The one anomaly from the
nodulation perspective is the inclusion of
Pickeringia
from tribe Thermopsideae, a prob-
lem discussed in Sprent (2007). Genera that have the 50kb inversion include most of
Sophoreae, a tribe that is divided into several groups. Although the evidence is far
