40 
PLANTS OF YELLOWSTONE NATIONAL PARK 
The genus Tofieldia is commonly known as lamb-lily. 
Mountain deathcamas (Zygadenus elegans ) .—This plant grows 
from a bulb and varies from a few inches to 2 or 3 feet high. The 
grasslike leaves are largely basal, but there are a few on the stem. 
The greenish white flowers are arranged in a simple raceme, and 
there is a conspicuous gland or spot near the base of each of the six 
parts of the perianth. 
Figure 22. —Mountain deathcamas. White. 
Photograph by A. R. Sweetser. 
Meadow deathcamas (Zygadenus 
venonosus) is very similar, but is 
a smaller plant with flowers only 
about half as large. This species 
is very poisonous when eaten by 
animals. 
Figure 23. —Twistedstalk. Greenish 
white. Photograph by A. R. Sweetser. 
Twistedstalk (Streptopns amplexifolius) gets its name from the 
fact that the stalk or pedicel of each flower is bent or twisted near the 
middle. The rather stout and branching stem is 2 to 4 feet high and 
the ovate, clasping leaves are arranged alternately. The greenish 
white or purplish flowers are borne in the axils of the leaves. 
Smilacina stellata has an unbranched, smooth stem which is 5 to 
20 inches high and sessile leaves which are usually folded along 
the midrib. The white, starlike flowers are borne in a simple 
raceme. The fruits when ripe are red berries. Found in moist 
