WESTERN MEADOW RUE 295 
Stamina numerosa, penduia; filamenta tenuia seorsim leviter 
clevellata antheris oblongis vel lineari-oblongis triplo longiora. 
Type specimen in U. S. Herb., sheet 431249, collected in 
the township of Oxford, Erie Co., Ohio, 8 June, 1895, by E. L. 
Moseley. The specimen is labelled, by the collector, T. polygamum, 
though it bears no relation to that group of plants whose mark 
is upright clear white filaments bearing very short anthers. 7. 
Moseley is clearly of the 7. purpurascens alliance, though wholly 
distinct from that by its foliage alone if by no other character. 
One peculiarity of the present plant is, that what one would 
have liked to call its terminal large leaflets are all completely 
divided into three leaflets, the middle one of which is petiolulate, 
the other three sessile; and whiie the trifoliolate terminals are 
together, as usual, larger than the laterals, some laterals are 
larger than the largest separate member of the triple terminal. 
It has come of my long and careful study of thalictrum leaves 
of all groups of species, and from all over our country, that I 
place such dependence on these organs for specific distinction 
as to dere ublish species, the fruits of which are unknown. Let 
the pistillate plants, and he fruits of eac be what they will, 
and even just alike, if it so prove, this and 7. amabile above, are 
valid and very different species. 
Thalictrum perpensum nov. sp. 
Caulis modice tenuis, 4-6 dm. altus, laete stramineus, plus 
minusve striatus, aut omnino glaber aut pilis setulosis brevibus 
sparsissime obsitus. Folia haud ampla, inferiora petiolata, superiora 
sessilia. Foliola terminalia 2-3 cm. longa, late obovata, apice 
trilobata lobis latis, brevibus, obtusiusculis, lateralia interdum 
ovalia, integra, omnia.superne laete viridia et glabra, inferne 
pallida et sparse albo-hirtella. Florum pedicelli, nec non sepala 
extus, sparse pilosi. Stamina alba, erecta, clavellata. Carpella 
oblique elliptica, distincte stipitate, sparsissime setulosa. 
Type specimens collected by myself on low prairie land 
about Strathroy in western Ontario, in June, 1910. It is the 
plant referred to by me under the name of T. dasycarpum in Vol. 
I. of this Journal, p. 104. I have now become convinced that 
real T. dasycarpum is a much larger plant, and of the group of 
T. purpurascens, while T. perpenswm is unquestionably of the T. 
corynellum alliance by its clear-white filaments all clavate and 
