THE DELETION OF CYPERUS HERMAPHRODITUS (CYPERACEAE: TETRAGONI) FROM THE LOUISIANA FLORA

4 Pages·2002·1.6 MB·English

by  David J Rosen

RHODORA,
Vol. 104. No. 920, 429-432, 2002
pp.
NOTE
THE DELETION OF CYPERUS HERMAPHRODITUS
FROM THE
(CYPERACEAE: TLTRAGONI)
FLORA
LOULSIANA
D/WID ROSCN
J.
U.S. Fish and Wildlife Service, 17629 El Camino Real Suite 21
1,
TX
Houston, 77038-3051
Jones
STANELiY D.
Box
Herbarium. Botanical Research Center. P.O. 6717.
TX
77805-6717
Bryan.
Fieldwork Louisiana prcKiuced collections of Cypcnis thyr-
in
We
Thomas
Jungh. {Rosen 789, 1084, no). reviewed and
siflonis
C
on
Allen (1993) for information the distribution of tliyrsifloms
Louisiana and found this species synonymi/ed under C. her-
in
Neo-
iiuiphroditiis (Jacq.) Standi., a putative, yet largely allopatric
tropical ally of the poorly circumscribed Section Tetragoni (Cart-
problem
and Jones This classihcation also occurs the
er 1997). in
Mcuiital of the Vascuhir Plants of Texas (Correll and Johnston
C
1970), erroneously extending the range of hennaphroditus into
Mexican
the southeastern United States. In his revision of the
species of Cyperus, Tucker (1994) also included Texas in the
distribution of C. hennaphroditus. Preparation of the Vascular
Plants of Texas by Jones (1997) brought to light that the
et al.
C
name herniaphroditus had been misapplied specimens of
to
C.
tliyrsifloms, thus necessitating the deletion of C. herniaphroditus
from the Texas flora. In Horvat's (1941) revision of the subgenus
Mariscus, she reported a collection of C. hennaphroditus from
Arizona, and an evident from Alabama, apparently the
''fugitive''
The
only collections for North America. remaining collections are
We
from Central America, South America, and Mexico. have
examined specimens herniaphroditus from Lou-
identified as C.
isiana (nlu, no) and found them to be C. thyrsiflorus and C.
pilosus Vahl. We, herewith, wish to continue the clarification of
two
taxonomic confusion associated with these species the
the in
southeastern United States by proposing the deletion of C. her-
niaphroditus from the Louisiana
flora.
429
430 Rhodora
104
[Vol.
The following key separates Cyperus thyrsijlorus from C. her-
C
Though
nuiphroditiis and C. pilosus. hermaphroditiis does not
occur Louisiana, included comparison. Cyperus
in for pilosits
is
it
ai^tparcnlly has often been mistaken for C. thyrsijlorus in Loui-
synonymy
siana, and therefore included in the key. Pertinent
is
following Jones el al. (1997), a brief description modified from
Tucker (1994) and Carter and Jones (1997), and an illustration of
C
thyrsijlorus are also provided.
KHY
Rachis glabrous
(2)
1
,
mm
7-9
Spikelets remote, per 5 rachis span proximal
2. in
half of rachis; achenes narrowly elliptic to oblong, 0.5—
mm C
wide
0.65 thyrsijionis
mm
more 18—26
Spikelets congested, per 5 rachis span
2. in
distal half of rachis; achenes elliptic to oblong to nar-
mm
rowly obovate, 0.6—0.8 wide
C
hcrfuapliroditiis
Rachis antrorsely strigose C. pilosus
1
.
Cyperus thyrsi Horns Jungh. Linnaea 24. 1831. Figure
6:
1.
C C
[= anccps Nccs
Licbin., C. dissidflorus C. ex Ton*., pollens
C
&
(Liebin.) SlandL Steyerni., regionionuinu.s pallens (Liebm.)
\ar.
C
Nees
KLik., frihracliiaUis (h'\chn\.) Kiik., Mariscu.s ilissiuflorns (C.
^^v
M. M.
Torr.) C. B. C^larkc, pallens Liebni., trihrcichiatas IJebin.|
20—40 cm
Rhi/omatous Mid-culm
diameter
perennial,
tall.
mm
mm,
0.5-L5 trigonous, smooth. Leaves 0.8-2.8 (—3.0) wide.
Infiorescenee rays (2—) 3-6; peduncles conspicuous; inflorescence
bracts 5—7. Spikes oblong to subglobc^se; spikelet length 3.4—7.4
mm
mm,
(—17.0) mostly divaricate; scale length 2.0-3.0 long,
veins and margin whitish, Sti^imas stamens mature achenes
3, 3,
1.8-2.1 www UmtT, 4_() 45 nim wide, triuonous, brown.
Infre-
quent dry-mesic woods, more conuiion waste places and
in in
Mex-
from
disturbed areas Florida w^est to Texas, the Caribbean.
and South America.
ico,
May
Rosen
Si^HCiMLNS liXAMiNtii); Louisiana: Ascensit^n Parish, 18 1999.
7S9 (NO); Avdycllcs, Ocl 1985, Thonuis 940HH (nlu); Cameron
et
11 al.
Parish. 6 Sep 1984, Thonuis et al 90S03 (nli); East Baton Rouge Parish, 17
&
Thomas
Jul 1934, Chihon Trotter P)4 (nlu); Uieria Parish, 22 Jun 1983,
McCoy
84J9J Sep Diwwin 1922
(nlu); JetTcrson I^nish, 1980, (nlu);
c^
I I
2002 Not 431
e
A
1
;
Figure Cypenis A. spikclcl showing overlapping
ihyrsijloiiis. fertile
1.
— =
scales (bar mm); B. habit (bar cm); C. spike showing oblong shape
1
I
—
and remote, mostly divaricate spikelets (bar mm). Drawn from Rosen
I
789.
432 Rhodora
104
[Vol.
a
40637
Orleans Parish, 28 Jul 1974, Thomcis (Ni.r): Plaqiiciiiincs Parish,
al.
4 Sep 1978, Flcmhii^ 395 (no); St. Bernard Parish, 17 Jun 1960, Lcnmirc 628
Tammany
(no): Parish, 28 Apr 2000, Rosen I0S4 (NO); Terrebonne Parish,
St.
16 Jun 199K Thomas et al. 123938 (nll); Vermilion Parish, 11 Jul 1989,
997 West Aug Curry 469
Slaui^htcr (nli:); Feliciana Parish, 14 1972. et al.
(nlu).
ACKNOWLBDGLMPNTS. Our cxlended
appreciation to the her-
is
barium Tulane University (no) and Northeast Louisiana
staff at
prompt specimen
University (nlu) for their response to our loan
Two
comments
requests. reviewers provided useful on an earher
Dawson
Eddy
version of manuscript. Mr. prepared the
this illus-
tration.
LITHRAIURH CITPD
Carter, R. and S. 13. Joni:s. 1997. Notes on ihe Cypcrus rei rojlexus conip]cx
Rhodora 319-334.
(Cyperaceae) with three nomenelatural proposals. 99:
CoRRHLL., AND M. C. JoMNSTON. 1970. Manual the Vaseular Plants
S.
13. ol'
TX.
of Texas. Texas Research Foundation, Renner,
A
HoRVAT, M. 1941. revision of the subgenus Marisciis found the United
in
I.
States. Catholic Univ. Amer., Biol. Ser 33: 1-147.
AND M. MoNTOOMiiRY.
JoNRS, K. Wmm-f, 1997. Vascuhir Plants of
S. D.,
J. P.
A
Synonymy,
Texas: Com|:)rehensive Checklist including Bibliography,
TX.
and Index. Univ. Texas Press. Airstin,
Thomas, R. D. C. M. Ai.lhn. 1993. Alias of the Vascular Flora o( Lou-
ani")
The
isiana, Vol. Fern Allies, Conifers, and Monocotyledons. Natural
1:
Heritage Program, Wildlife Louisiana Depl. Wildlife and Fisheries,
13i\.,
Baton Rouge, LA.
Tucker, G. C. 1994. Revision of the Mexican species of Cypcnis (Cypera-
Monogr. 1-213.
ceae). Sysl. Bot. 43: