Toxicodendron vernix (L.) Kuntze

BOTANICAL
U.S.A.
Anacardiaceae Toxicodendron vernix (L.) Kuntze
det. M. Nee, 2016
WISCONSIN, Richland Co., 1.9 km. SE of Twin Bluffs,
Sextonville Bog, between Hwy. 14 and old railroad (now
the Pine River hiking/biking trail).
43°15’35”W, 90°18’02”W. alt. 213 m.
T 9 N; R 2 E; NWMNEK sect. 18.
Extensive marsh of Typha, Sparganium with scattered
Alnus incana ssp. rugosa, and patches of Larix laricina
surrounded by Toxicodendron vernix, but without
Sphagnum or Ericaceae. Floodplain of Pine River but
mostly isolated from influx of silt during floods.
Shrub 3 m. tall, 3 cm. in diameter, ca. 15 years old; fresh sap
pale orange, turning tarry black; undoubtedly this is the
collection that gave me a severe “poison ivy” rash. Voucher
for wood specimens at Kw, Lw, MADw, MEXUw. Petiole
and leaf rachis red. Inflorescence nodding; fruit yellow-green.
Coll.: M. Nee 63118	25 July 2016
Missouri Botanical Garden (MO)
03176505