Zanthoxylum americanum Mill.

Rutaceae Zanthoxylum americanum Mill,
det. M. Nee, 2016
WISCONSIN, Richland Co., 3 miles SE of center of
Richland Center.
43°18’15”N, 90°20’15”W. alt. 220 m.
T 10 N; R 1 E; sect. SWViNEVi sect. 35.
Formerly pastured, level terrace just above the floodplain,
between cultivated fields and the Pine River floodplain, in
broad valley. With scattered Quercus macrocarpa, Q.
ellipsoidalis, the area originally savanna.
Pistillate clone ca. 15 m. in diameter, forming a low, circular
dome shape, the larger (older) stems in the middle to 4 m. tall,
to 9 cm. in diameter and 23 years old (e.g. the stem cut for
wood specimen), irregularly spaced, ca. 1 m. apart, but with
some smaller ones interspersed, the clone still expanding with
sprouts less than 1 m. tall on the periphery. Voucher for wood
specimens at Kw, Lw, MADw, MEXUw, RSAw. Evidently in
or near anthesis as staminate clones in the vicinity are
beginning to release pollen. Pistillate; the inflorescences
inconspicuous, with a few ferruginous hairs; perianth and
stigmas yellow-green,
Coll.: M. Nee 62899	25 April 2016
Missouri Botanical Garden (MO)
03754067