92 The Botanical Gazette. [ March, 
on many species, thus verifying the thought of Mr. Meehan. From 
an examination of my preliminary notes upon the genus, verified bya 
reéxamination of the specimens, I report the finding of cleistogamous 
flowers upon the following species: P. avifolium, in which the achenes 
in my specimens were incompletely developed; P. Bolanderi, P. Cale 
fornicum, P. Careyi, P. Hartwrightiit, P. Hydropiper, the condition 
being extremely common in this species; P. hydropiperoides, mn which 
P. maritimum, P. ramossissimum, in which case, however, I am 2 
thoroughly convinced as to the cleistogamous character of the flowers 
so referred; P. sagittatum, and P. Persicaria. 1 found that in almost 
every case in which I had Jaze collections of the species mentioned 
in every case examined the achenes were perfected; P. /apathifolium, 
- ot 
above, cleistogamous flowers existed. That more species are not ID 
cluded in the list is, I am inclined to believe, due to the fact that the 
specimens of the other forms in my possession were collected in the 
earlier portion of their season. I believe that in all cases where col- 
lections are made after Sept. rsth, cleistogamous flowers may be 
reasonably expected. 
The figures given by Mr. Kearney in the note referred to above 
present an exceptional condition. In the many forms which I have 
examined it only occurs once or twice. Ordinarily the cleistogamols 
flowers are completely concealed by the sheath, but if well developed 
their presence may be detected by the appearance of an apparent ae 
tumescence of the sheath on one side of the stem and slightly above — 
be well developed. I have as yet detected only a single flower at & 
node, but am not prepared to say that this is the rule. 
In this connection I would like to ask botanists throughout Me : 
ospores chez le genre Saccharomyces. Comp. rend. trav. 
Tg, 1, p. 30; also see Zopf, Die Pilze, p. 414. 
1 Les ascos: 
_ Carisbe: 
