ADDITIONAL NOTE ON THE SYNDESMON INVOLUCRE.
A. Wetzstein.
In addition to the observations made by Mr. F. H. Burglehaus, Toledo, Ohio, concerning the involucral leaves of Syndesmon thalictroides Hoffmg., as stated in No. 5 of the Ohio Naturalist, I also confirm the contradiction in the habitus of plants growing in Auglaize County with the description in Britton & Brown’s Flora. All specimens I found here have no sessile involucral leaves, but petioles mostly about one-fourth of an inch in length. Especially the later flowering plants, that often grow over one foot high, show petioles of more than one-half inch in length, while even the earliest—collected about the middle of April, and no more than three inches high—exhibit distinctly petioled involucral leaves.
It might be very interesting to find out the range of plants with sessile involucres—for I do not at all think this description of Syndesmon to be an error in so carefully prepared a Flora as Britton & Brown’s is, the more as the given figure shows strictly sessile involucres too.
St. Marys, Ohio.