Table Of ContentTAXONOMICA
FOLIA CONSPECTUS OF MYRIOPUS
4.
THE GUIANA
(HELIOTROPIACEAE: BORAGINALES)
SHIELD
IN
Christian
Feuillet
Deportment MRC-166
of
Botany,
ABSTRACT
RESUME
In the past few understanding between was
years, a better of the relationship taxa of the Boraginales the
new
focus of several papers through the examination of old and the gathering of morphological data
re-
&
and
the analysis of molecular data (Diane 2002, 2003; Hilger Diane 2003; Gottschling 2005;
et al. et
al.
&
Miller Gottschling 2007). Familial and generic limits have been re-considered. In the preparation of the
treatment of the Boraginales for the Flora of the Guianas, had to decide whether should follow the
tra-
I I
taxonomy
used
ditional as for the Boraginaceae treatments in "Flora of Venezuelan Guayana" (Miller
et
al.
and
1997) in "Checklist of the Plants of the Guiana Shield" 2007) or adapt the
(Feuillet et to to reflect
al. it
changes proposed 1997 As work
with
since in the systematic of this group. often the case in progress,
is
it
some
proposals should be from and
adopted, like the separation of Varronia P.Br, Cordia L. (Cordiaceae) of
when
Myriopus Small from need work more
Tournejortia L. (Heliotropiaceae), other aspects further including
species in the data sets, like the split of Heliotropium L. and its relation with Tournejortia Currently less
s.s.
10%
than of the species have been analyzed in the whole Heliotropiaceae and some major
likely that
is
it
and
clades of Heliotropium Tournejortia are missing from the data
sets.
s.l. s.s.
new
The
part of the classification of the Heliotropiaceae proposed by Diane and her colleagues
that
most
is likely to resist larger sampling the separation of Myriopus from Tournejortia and standing as
is its
group and was by new
a sister to Heliotropium Tournejortia pointed out Johnston (1930) that his
s.l. s.s. It
He
Tournejortia sect. Cyphocyema I.M. Johnst. was distinct from the core of Tournejortia. suggested on a
morphological basis that the two sections of Tournejortia were closer other genera than each
to to other.
new
Small (1933) included two species of Cyphocyema in his genus Myriopus and said there was more
sect.
The
Neotropical morphological Myriopus from
species. characters that separate apart Tournejortia are
s.s.
elongated corolla lobes, narrow with involute margin, anthers connate and always hairy apex,
its
its at its
drupoid and
fruits distinctly lobed not dividing into mericarpids, four 1-seeded endocarpids that are
its
strongly curved, and curved embryos (Johnston 1930; Diane 2002). The molecular and morpho-
its et
al.
logical data sets used by Diane (2002, 2003), Hilger and Diane (2003) confirmed the deep separation
et
al.
between
Cyphocyema and most The
Tournejortia of the Heliotropiaceae. Cyphocyema/Myriopus branch
sect.
supported by 100%
is bootstrap percentages of in all trees. Logically Diane et (2002) proposed to use
al.
name
Myriopus Small The
as a generic for the species of Tournejortia Cyphocyema. conspectus presented
sect.
&
below
is listing the taxa of Myriopus present in the Guianas (Guyana, Surinam French Guiana) and the
&
Venezuelan Guayana (Amazonas, Amacuro), most
Bolivar Delta the part of a region often referred to as
Journal of the Botanical Research Institute of Texas 2(1)
KEY TO THE GENERA OF HELIOTROPIACEAE
II
when
dry
fresh
iually
Myriopus candidulus comb. no\
(Miers)
Feuillet,
Enum.
(non
r scandens Willd. Mill. 1768),
.
MyiiopUS paniculatUS (Chamisso) COmb. nov. BASIONYM: Chamisso, Linnaea 4:468
Feuillet, Tournejortia paniculata
DC,
comb.
Myriopus paniculatus spigeliiflorus (A. DC.) Feuillet, nov. Basionym: spigdiaejlomA. Prodr. 9:525
var.
t.
GUYANA:
DC)
Rob
1935.
Chamisso I.M. Johnst, Arnold. Arbor. 16:49. Type:
1845. Tournejortia paniculata var. spigeHijlora (A.
J.
Myriopus volubilis (L.) Small, Man. S.E. Fl. 1131. 1933. Tournejortia volubilis L., Sp. PL 140. 1753. Lectotype: "Bryonia
TO THE GUIANAN
KEY SPECIES
white-pubescent.
cence terminal with short branches, appearing as a very contracted panicle; fruits
lateral
M. candidulus
(Guyana)
mm
tube
Corolla 1.5-2.5 long, constricte
2.
(Guyana, Surinam, French Guiana)
tube
long as the or less; fruit yellowish, p
young stems and
inflorescence
Leaves,
3.
Gi
(Guyana, Surinam, French
to
linear.
young and
stems
Leaves, inflore:
3.
M. paniculatus spigeliiflorus
long acuminate. (Guyana, Surinam, French Guiana) var.
Conspectus of Myriopus the Guiana Shield
Feuillet, in
ACKNOWLEDGMENTS
would thank
the reviewers suggestions regarding
like to for their
I
U
herbaria CAY, F, NY, P and for lending the material in their care.
Guiana Program
Biological Diversity of the Shield publication series.
REFERENCES
A
and vm, and
Diane, H. Forther, H.H. Hilger. 2002. systematic analysis of Hetiotropi Tournefortia, allied taxa of the
N.,
based on sequences and morphological Amer. 89:287-295.
Heliotropiaceae (Boraginales ITS1 data. Bot.
J.
Diane, N., C. Jacob, and H.H. Hilger. 2003. Leaf anatomy and foliar trichomes in Heliotropiaceae and their systematic
198:468-485.
relevance. Flora
and 224-226.
Feuillet, C.J. Gaviria, R. Gomez, J.S. Miller, G. Rodriguez. 2007. Boraginaceae, In: Funk, V.,T. Hollowell,
P.
Berry, C. Kelloff, and S.N. Alexander. Checklist of the plants of the Guiana Shield (Venezuela: Amazonas, Bolivar,
Delta Amacuro; Guyana, Surinam, French Guiana). Contr. Herb. 55:1-584.
U.S. Natl.
M. and 2005. Congruence of phytogeny of Cordiaceae
Gottschling, M., Miller, Weigend, H.H. Hilger. a (Boragi-
J.S.
nales) inferred from ITS1 sequence data with morphology, ecology, and biogeography. Ann. Missouri Bot.
92:425-437.
Gard.
and A based on and
Hilger, H.H. N. Diane. 2003. systematic analysis of Heliotropiaceae (Boraginales) trnL ITS1
9-41
sequence
data. Bot. Jahrb. Syst. 25:1
1
Johnston, 1930. Studies the Boraginaceae. Treatment of Tournefortia. Contr. Gray Herb. 92:66-89.
I.M. in -VIII. 3.
and and
Miller, J.S., J. Gaviria, R. Gomez, G. Rodriguez. 997. Boraginaceae. In: RE. Berry, B.K. Hoist, K. Yatskievych,
1
the Venezuelan Guayana 3:527-547.
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eds. Flora
Miller, and M. Gottschling. 2007. Generic classification in the Cordiaceae (Boraginales): resurrection of the
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genus
Vorronia Br.Taxon 56:163-169.
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New
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the southeastern
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