. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. AMBROSIACEAE. Vol. III. 6. Xanthium pennsylvanicum Wallr. Pennsylvania Clotbur. Fig. 4137. Xanthium pennsylvanicum Wallr. Beitr. Bot. I: 236. 1842. Stem comparatively slender, smooth below, roughish above, i°-3° high. Leaves thin, long- petioled, sharply toothed and some of them 3-5-lobed, smoothish, or the upper surface scabrate, glandular; burs clustered in t
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. AMBROSIACEAE. Vol. III. 6. Xanthium pennsylvanicum Wallr. Pennsylvania Clotbur. Fig. 4137. Xanthium pennsylvanicum Wallr. Beitr. Bot. I: 236. 1842. Stem comparatively slender, smooth below, roughish above, i°-3° high. Leaves thin, long- petioled, sharply toothed and some of them 3-5-lobed, smoothish, or the upper surface scabrate, glandular; burs clustered in the axils, 7"-g" long, about one-third as thick, puberu- lent and resinous-glandular, and commonly with a few longer hairs; prickles numerous, subulate, hooked, more or less hispid or gla- brate, the longer ones nearly as long as the diameter of the bur; beaks slender, but stouter than the prickles, incurved and hooked. Moist gorunds, Quebec to Minnesota, New- York, Missouri and Colorado. Re- ferred in our first edition to Xanthium canadense Mill., a name which has been variously applied to different plants by authors. 7. Xanthium commune Britton. Cockle- bur or Clotbur. Fig. 4138. Xanthium commune Britton, Manual 912. 1901. Stem rather slender, i°-2°, roughish. Leaves broadly ovate, more or less lobed, scabrous, espe- cially above; burs commonly solitary in the axils, oblong, 7"-i2" long, half as thick, or less, the subulate-conic beaks slightly incurved, hooked at the apex, about as long as the subulate uncinate prickles, which are hispid to about the middle with brown hairs and shorter than the diameter of the bur. Moist grounds, Quebec to Alberta, Maryland, Mis- souri, Utah and Arizona. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Britton, Nathaniel Lord, 18
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