Colorado Plants Injurious to Livestock 6 i 
Sand bur is not known to possess poisonous properties. The 
prickles on the burs sometimes cause serious mechanical injury. 
BLACK HENBANE (Hyoscyamus niger) 
This is a coarse biennial (fig. 86) plant i to 2 feet high. The 
leaves are wavy along the margin and clasp the stem. The flowers 
are large, dull yellow in color, with purple veins, and arranged along 
one side of the stem in a characteristic fashion. When the fruit is 
mature, it opens at the top by a lid (fig. 87). The plant has been found 
in a few localities in western Colorado. It is common is eastern states. 
Poisoning by henbane. —Dr. Chesnut says of black henbane: “One 
or two cases are recorded in foreign literature in which stock have been 
poisoned by eating the plant of their own accord, but there is very little 
danger from it, on account of its ill odor and harsh texture.” It is from 
this plant that hyoscyamin is obtained for medicinal use. It is an an¬ 
odyne, hypnotic and is poisonous. 
JIMSON WEED, JAMESTOWN WEED (Datura stramonium) 
A rather stout plant (fig. 88) i to 4 f^et high, with green stems, 
and leaves 4 to 8 inches long and angular toothed. The flower is showy, 
Fig. 88.—^Jimson weed (Datura stramonium). 
