Vermischte neue Diagnosen. i 401 
Achenia oblique oblongo-elliptica, sessilia. — North Dakota: This small 
species inhabits dry prairie about Leeds, where it comes into flower late 
in May, maturing its fruit early in July. Dr. Luneli has distributed it 
under the name of T. venulosum, but the plant lacks the characters of 
that species, its leaves being thin and not at all „rugose-veiny“ even 
beneath. Its achenes are nearly twice as long as in that species and 
much narrower. — The plant wich T. thyrsoideum most resembles is my 
T. campestre belonging to the high grassy plains of Manitoba and Assini- 
boia, which is very prominently veiny beneath, and has also the ovate 
achenes attributed to T. venulosum. 
674. Thalictrum Lunellii E. L. Greene, 1. c., p. 102. — Planta dioica fere 
metralis, caule laete viridi, laevi, glaberrimo, folioso, foliis periamplis; 
folia omnia subsessilia, pagina superiore saturate viridia, inferiore glauca; 
foliola magna 4 cm longa, 3—3,5 cm lata, basi et obtusa et subcordata, 
supra medium late et inequaliter, nec profunde, 7—9-loba, lobis brevibus 
latissimis obtusis, saepissime cuspidato-mucronatis. Achenia 5—8, brevia, 
crassiuscula, vix compressa, oblique ovalia, circa 6 mm longa, apice 
acuta, turgide 8-costata. — This fine species, belonging to the group 
T. dioicum, T. confine and T. occidentale, was collected in July of this year 
(1909), in moist thickets of tbe Souris River near Minot, North Dakota, 
by Dr. J. Lunell. — Any one acquainted with the geography of North 
American botany would naturally expect that a new Thalictrum from the 
Souris Valley would by character indicate relationship to some Rocky 
Mountain species like T. Fendleri, rather than to any member of the 
genus which is of the remoter Atlantic or Pacific slope of the Continent. 
But T. Fendleri has definitely compressed achenes, with comparatively 
thin pericarp, of peculiarly oblique or one sided outline; and the nearest 
kindred of our new type from North Dakota, are the species first men- 
tioned. It is not in ear contact with T. occidentale, a species of Van- 
couver Island and adjacent coastal regions, for that, according to 
Dr. Gray who first published it, has slender achenes a half-inch long. 
The short plump achenes of T. Lunellii proclaim its nearer affinity for 
T. confine of extreme northern New England; from which the Dakotan 
Species differs by its larger, comparatively thicker, and quite turgescent 
achenes, as well as by its ample foliage of large leaflets quite diffe- 
rently cut. 
675. Thalictrum vegetum E. L. Greene, l. c. p. 103. — Planta e 
grege T. polygami, illi magis vegeta, licet humilior. Caulis atrovirens, 
‘ striatus, fere usque ad inflorescentian foliosus, apicem versus pilis 
brevibus plus minus appressis sparsim obsitus. Folia caulina ampla, 
circa 3 dm longa, petiolis leviter, petiolulis, magis crebre, hirtellis; foliola 
maxima, saepissime 5—6 cm longa; circumscriptina late obovata supra 
medium late trilobata, lobis obtusis, plerumque integris, mediano interdum 
inaequaliter trilobo; foliolorum textura membranacea, pagina superiore 
saturate glauco-viridi, sparsim pubigera, inferiore glauca et plus minusve 
tomentulosa. Filamenta alba licet basi capillaria. et omino pendula; an- 
Repertorium specierum novarum. 1X. 26 
