5 
THE STEM. 
Hollow in Uvularia. 
Solid in Oakesta. 
There are two strata of bark-cells between epidermis and the 
mechanical tissue in Uvularia. 
Only one stratum in Oakesza. 
The mechanical tissue consists of about two strata in Uvudaria- 
The mechanical tissue consists of five strata in Oakesza. 
These two species show then quite a considerable difference in 
regard to their vegetative propagation and tendency to spread. 
The one, Uvularia, has a very short subterranean stem, but long 
stolons, which are soon able to develop new plants, therefore it 
occurs always abundantly where it grows. The other one, 
Oakesia, has a long, creeping rhizome without any formation of 
stolons; this manner of propagation is evidently not as important 
as the first one, where stolons were present. There is at least 
not to be observed so large a number of plants growing together 
as is the case of Uvularia. 
Diclytra Cucullaria. ‘‘ A cluster of grain-like tubers, crowded 
together in the form of a scaly bulb,” is the only description 
which has been attributed to the rhizome of this plant in the 
sixth edition of Gray’s Manual of Botany. It is rather astonish- 
ing that nothing more has been remarked upon this subject, the 
structure of these so-called “tubers” of a plant so common and 
well-known, as it is among the earliest-blooming of our flora. It 
does often happen, however, that these common species escape 
the attention of the botanists, thus they become at once well-known 
and not known at all; it seems at least to be the case with this 
plant. We shall see later that our plant does not possess any 
tubers at all, and that the rhizome shows a very interesting struc- 
ture; in spite of that the author has been unable to trace the de- 
velopment of it from the very earliest stage of the germination. 
If we dig up the plant in the early spring, for instance in the 
month of March, when it is just commencing to bloom, we then 
see a rhizome, consisting of a number of light rose-colored tuber- 
like bodies, covered with dark crimson spots and clustered 
together so as to forma scaly bulb. We shall see farther that the - 
size of these tuber-like bodies is different, there being always a few 
