NOMENCLATURAL CHANGE IN THE DIGITARIA COGNATA COMPLEX (POACEAE: PANICEAE)

2 Pages·2001·0.69 MB·English

by  Joseph K Wipff

CHANGE THE COGNATA
NOMENCLATURAL
DIGITARIA
IN
COMPLEX
(POACEAE: PANICEAE)
Joseph K.Wipff
Pure Seed Testing, Inc.
OR
Hubbard, 97032
U.S.A.
A Manual North
During the preparation of IJiyUana Haller lor the of Grassesfor
D
America and iluu >nofthe ubspeci* o a (Schult.)Pilger,
after a o\ m.it
rei
,
com varum Divitan ungual nbsp pubiflora (Vasey)
\va hided that thi of a
cl<
it
was
Wipff rank warranted.
to specific
Wipff and Hatch (1994) recognized two subspecies of D. cognata, but a re-
components showed two
evaluation of these taxa using principal analysis the
The morpho-
and distinguished from one another. key
taxa be distinct easily
to
number
two vena-
logical characters separating the taxa are: 1) the of veins; 2)
pattern
non-equidistant the vestiture of
pattern (equidistant veins); 3)
tion vs.
sympatry two
the lower lemmas; and 4) spikelet shape. Also, in the area of the
maintain morphological distinctness and no putative hybrids be-
taxa their
from
tween the two taxa were found in the populations studied or the 1,839
herbarium specimens examined A mure paper will discuss the data warrant-
I
new combination, which made now use in the forth-
ing the following is for its
coming Manual \mcru:a
oj'Gnissi ;joi \
>rt.h
comb,
pubiflora (Vasey) Wipff,
Digitaria
i
iom.nud.]Dept.Agr
ngel var. puhiflonim Vasey. Descr. Cat. Grasses US: 9. 188^
i
1
m«m mi JWipfLSu
,mnn huh Vasey
nl»
Hot. Hiv. Hull ,» /), i,i, U']l,.>
, | ii i i
|
UNITED
TYPE: STATES. TEXAS. El Paso Co.: "Mts. near Pasc
&
C.R. Uisevs,, (LECTOTYPE: Wipff Hatch 1994: US!; 1S0LECT0TYPE: USf
i.
TAXA
KEY TO
Lower lemmas 7-veined, veins non-e quidistant;spikeletsglabr<
D.cogna
pubescence between the yen 2.
of
Lower lemmas 5-veincd, veins equndistant;spikelets densely pubescent betv
3.D.pubiflo
narowlv
ve ns;sfvkelets e liptic
;
ACKNOWLEDGMENT
thank Kanchi Gandhi (GH)
review
for his of the
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