Xanthium arcuatum

Xanthium arcuatum Milisp. & Sherff, Field Mus. Publ. Bot. 4:
4. 1918. Stem scabrous above, 3-5 dm. high; leaves about 1 dm. long, the petioles and blades subequal; blades deltoid-ovate, 3-5-lobed, dentate, cordate or subtruncate at the base, scab-
* A rare, apparently mutant form occuring in Kansas, with fruits resembling those of X. globosum but usually containing 20-30 ovaries. rousonboth sides; body of the fruit narrowly ovate, armed with numerous prickles, covered
with many glands, finally 1.3—1.5 cm. long and 5-6 mm. thick; beaks straight or slightly
arcuate, hooked at the apex, not pubescent but the lower part glandular, 3.5-5 mm. long;
prickles slender, mostly arcuate, more or less reddish-purple, hooked at the apex, glabrous
except as to small glands below, 4-6 mm. long.
Type locality: Chemung County, New York.
Distribution: New York.