NEW PLANTS FROM NORTH DAKOTA 93 
(a) The leaves of the lower series not passing 
very abruptly into the leaves of the upper 
series. 
(b) The leaves of the lower series large, 
long-petioled and very distant.............. 4. var. praestans. 
(b) The ledves of the lower series middle- 
sized, with shorter petioles, more or less 
distant. 
Co) le Canwest pi bescenttc ass ee ase oes eat 5. var. multiplex. 
(eo) heaves. clara tent siasarr tees e Seber e 6. var. perusta. 
(b) The leaves of the lower series are 
middle-sized, with short, narrow petioles, 
andarathervap proximate ue. erie se ake nies 7. var. angustata. 
(b) The leaves of the lower series short 
and broad, with short and broad petioles, 
AP PLO xitiate wishin mets iets ews tea ec Gel CL le eT nO GAC 
The var. basilaris has short and broad leaves, is a small plant 
of no usual occurrence, and grows in dry, elevated soil. 
The var. supereminens is a middle-sized plant with a very 
peculiar aspect, on account of the remarkable and sudden change 
between the lower leaves and those situated higher up on the stem. 
It is one of the forms that will be met occasionally. 
The var. praeceps is an undersized or middle-sized plant, often 
with a pubescent, dense foliage along the whole stem, prefers a 
dry soil. 
The var. praestans is a bright-green plant that generally 
becomes very luxuriant and beautiful. It is the largest of all of 
our varieties, and is quite common in valleys and ravines and 
in rich prairie soil with sufficient moisture. 
The var. multiplex has broadly to narrowly lanceolate lower 
leaves with rather narrow petioles, is usually somewhat more than 
middle sized, not stout, more variable than the other forms, and 
is the most common of all of them. 
The var. perusta is rather stoutish, with thickish leaves, and 
was found on sunny spots where the prairie and the woodland 
meet. 
The var. angustata is rather stout, has leaves with shorter 
petioles than var. multiplex, but narrower and longer than the 
following variety. Occasional. 
The var. opima is remarkably stout, with a profusion of short 
and broad leaves, on short and broad petioles, and the specimens 
I have seen show a large number of heads on stout, long peduncles, 
