
          collected so far as I know for Nuttall.

My little Echinodorus sent to you one or two years ago
is very distinct from your Alisma geyeri, which is a true Alisma
it has also 9 stamens, very slender [?] simple
umbell etc. Echinodorus I think ought to comprise
all Alismae with a globose head of carpells; Alisma
has them verticillate; E. has mostly more than 6
stamens, though the European A. panassifolia, [?]
& natans appear to belong here also; carpells ribbed
A has 6 stamens, carpells verticillate, compressed,
[added:(1-3)] [?] on the back, smooth on the sides, style persistant
but blunt, ventral, in E pointed and [added: rather] more terminal.

[Najis?] & Caulinia are so far entirely unknown to
me, and I have not had occasion to examine
them;  I am much obliged to you however for your
interesting communications, and shall try to
study ours next spring.

I am anxious to learn about the [?] of
the Exploring expedition.  Send me if you [?]
fragments of all the species - known or new -
they will be important to me. I had formerly
applied to [?] [Rich?] but was refused.

Very truely yours

G Engelmann

        