NEOTYPIFICATION OF ENSLENIA ALBIDA AND A NEW COMBINATION IN AMPELAMUS FOR CYNANCHUM LAEVE (APOCYNACEAE: ASCLEPIADOIDEAE)

5 Pages·2001·2.8 MB·English

by  Alexander Krings

AND
OF ENSLENIA ALBIDA
NEOTYPIFICATION
CYNANCHUM
NEW AMPELAMUS FOR
A COMBINATION
IN
ASCLEPIADOIDEAE)
LAEVE (APOCYNACEAE:
Alexander Krings
em
Herbarium, Depart
it
> < . ' ,
genera of the trib
rid
i
en Yiianclut.
lie
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\m clamusalhidus{NunMV
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INTRODUCTION
Gonolobus
Cynanchum was originally described as laevis
(Michx.)
laeve Pers.
namely
due mixed elements on the type sheet, flow-
Michx. in 1803. However, to
gonocarpus (Walter)
(Gonolobus
(L)
and angled uberosus R.Br.
ers follicl. o\
-
confusion has surrounded the cor-
and Michx.,
Perry) leaves of G< olob u s a v s
1 1 1 I i i
Woodson Drapalik 1969
1941,
nomenclature of this entity (see Vail 1899,
rect
with Michaux's descrip-
material
more LB con< ling the
detailed discu: ion
for
on
elements
corresponding
accepted the
Gonolobus Vail (1899)
tion of laevis,
known Ensknia
belonging the taxon in her time primarily as
the sheet as to
Ampciawus and designated the appro-
Britton
albidus (Nutt.)
albida Nutt. or
priate elements on the sheer as he type lor ,onolobus lacvis Michx. An image
(
i
specimen
of the is available in the IDC microfiche (#6211) set of the Michaux
herbarium on 29 volume
fiche of
I.
A
type specimen wasnot
designated by NurtalU
1818) in hisoriginal descrip-
tion of Enskniaalbnlc! on ihc other hand, hough he
alt clearly described
165)
(p.
the 5-parted
corolla of linear-oblong and
petals the entirely deeply
free, bifid
coronal segments
of the species Based on
Misdescription the "Genera North
in of
American
Plants'XNuttall saw
1818), it is likely that he at least three specimens
in the course of the work-presumably from
collected the following
localities:
banks of the and
river ScioU)"(c)hi(i,l.i.S.A), "m>ai Cincinnati
(Ohio)"(U.5.A).
Unfortunately, no specimens
bearing
these
localities, or the distinctive asterisk
notation used by Nuiiall on herbarium when new
sheets describing genera
or
species, could be found PH-the
at repository for the majority of types from
his
"Genera"
(Penned 19%; Stuckey nosuch
I960). In addition, specimens could be
I
BM
found
at (the eventual repository lor NuifalPs private herbarium and most
post-"Genera" FGH, MANC1
collections), MO. and NY-all
E, K,
IV, potential
1 1,
collections to host Nuttall material (Penned UU6:Stuckev Cowan
U)60;Stafleu&
The DWC,
1981). herbaria of and were
Fl, P also contacted, but no
were Sped mens
received. Enslcn
a\~ in collected by Nuttall in Arkansa
"Genera") were found BM, G-DC, NY, and
at however. two
PI In addition, speci-
I,
mens
from Ohio were found G-DC OXP
respectively and Of two
at the
speci-
mens
G-DC,
residing the one from Arkansas was
at
received by DeCandolle
in
and
1825 the one from Ohio
in 1824. Unfortunately on
labels both specimens
are in DeCandolles hand and not
in Nuttalls. Thus, from
aside DeCandolle's
word, no
there is other evidence that Nuttall actually saw On
the specimens.
the other hand, no
there reason
is to believe that DeCandolle would
forge the
specimens'
history. Nuttall apparently passed through Ohio
only
three times
H
Nov
in his Jun-Jul Oct and Mar
life: 1816, 1818, 18 (Pennell
1936). Interest-
Ohio G-DC
ingly, the specimen
at bears inflorescences bloom.
in lull In the
northern United known
he
States, species to flower primarily through Au-
is
1
gust (Gleason
1952). It is unlikely that flowering would ex-cur in mid-Oct
through November
or in early March. Thus, can be deduced
that the material
it
is likely part o( Nuttalls original collection of the species the summer
in of
1816, prior to his later description the novelty
oi in his "Genera." In the absence
any
of other material with own
labels in Nuttalls hand, the Ohio specimen
at
G-DC
is here chosen as the neotype of Imslenui
alhidci Nutt. should be noted
It
OXF
however, that the Ohio may
collection at also belong
to Nuttall's original
OXF
1816 collection. Aside from the species name, the specimen
label bears the
locality ("Ohio"), "com. Nuttall," and a year which could not completely make
I
The
out specimen
CT8?0"). also bears an inflorescence and
lowers, leading
to
I
Ohio
the same deduction concerning potential year of collection as the speci-
its
G-DC
men
at
homonym
due an bnslcrua I.udovic.
Unfortunately, to earlier u.o. Ral., :
l.
I
name Emlcnia wa climbing milkweed
the generic unavail the
1817), bl< toi
m Ampdamus
mud
taxon Nuftall Ualnu ,qm ILL)) n .red that
n In u! u<
v<
I
Psammos
(Ampelos [apnEkoQ = = sand) be used. Britton (1894)
vine,
[\)/aa|Lijio^]
combination name. Unfor-
validly published the requisite for the species
first
"Ampdanus: was
genus This spelling
tunately, Britton (1894) spelled the fol-
lowed by Vail (1899) and appears again in the key to the Asclepiadaceae in
How-
genus and
Gleason although not in the description of the species.
(1952),
made combination main-
as Britton (1894) explicitly noted that he the "to
ever,
m- nam cm u Wxxl mi LHI
Rafinesquesvci hin,t u auilioi-
tain nam.
t
\ -
<
Ampdanus" an
ortho-
Shinners 1964; Liede 1997a, 1997b) hav< recoj lized as
Ampdamus.
graphic error to be corrected to
names
Numerous Gonolobus,
authors have treated the respective in
Ampdamus synonymy combination
and within Persoon's 1805 of
Enslenia, in
Cynanchum (Michx.) based on Michaux's Gonolobus laevis (see
laeve Pers.,
&
Woodson Johnston
1941; Shinners 1964; Radford et 1968; Correll 1970).
al.
However, recent taxonomic advances are supportive of recognition of various
m
milkweed woimh ubim (lux
climbing oiiioliiiiii
n<
•< (I (
1
i i
&
Meve Although Liede (1997a) suggested caution
1997a, 1997b; Liede 1997).
Ampdamu
implied cceptance through
regarding resurrection he list-
of
il
I
ubmU
genus nopa and genera he tribe Asclepiadeae
ing of the in a oi tin oi
-a
t
\mpdumu
albulu currently the "standardized
lied. )0 |,i in us< s
is
\
1
Weed America
name (Patterson 1989)
accepted by the Science Society of et al.
Weakley, note
and has additionally appeared in recent drafts in prep.), a
(e.g..
name
establishing the correct of the entity warranted. Resurrection of this
is
unispeci genus requires a new combination based on Gonolobus laevis Michx.
fie
TREATMENT
SYSTEMATIC
Ampelamus (Michx.) Knngs, comb. no\
laevis
hum
ISOUOyikim Licvc i.Mich.\J Syn.
Pers., pl.l:
1:110.
MPC
UH-niTM'f #6211 120')
ACKNOWLEDGMENTS
Loan
thank
Paul Fantz, the lnterlibrary
upport, or insight,
I
Carolina State University Libraries. Sigrid Liede,
i
kind searching
assistance
for in fe
,
arranging loans or digi al mages ol specimens ml heir col lections, thank David
I
i i
Chamberlain John Fdmondson Edwards (MANCH),
(K), (E1V), Sean David
Goyder (MANCI
(K), Stephen larns (GXP), IVta Haves Helen Hoy Rob
(E),
1),
1
Huxley Fernand Jacquemoud
(BM), G-DG).
(G, Walter Kittredge (GH), James
Lendemer Eoughtman (MANCH),
(PH), Pindsey James Macklin
(PH), Serena
-Mm
M
Gad
k one Simon Owens
nei )\| in U Nie Dou-
llei liri (K),
>.<
i ) ( e, )
Wood
glas Stevens (MO), Roy Vickery (BM), and Emily (GH). Fred Barne and
Eric Sundell provided thoughtful reviews of the manuscript.
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m
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i < l<
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i
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