102 MIDLAND NATURALIST. 
ly to ascertain until we have other and more complete specimens, 
with mature fruit. 
Thalictrum thyrsoideum nov. sp. 
Planta inter affines humilis, 2—3 dm. alta, caule simplici 
rigidiusculo, leviter anguloso-striato, sparse folioso, in inflores- 
centiam nudam  subconfertam et  thyrsiformem  terminante. 
Folia plerumque 3, non ampla, breviter petiolata; foliola 
firmiter membranacea, parvula, rr—:3 mm. lata, suborbicu- 
laria aut interdum late subcuneato-obovata, supra medium 3-loba, 
lobis 2—3-crenatis, supra glauco-viridia, subtus glauca, utrinque 
minutim reticulato-venulosa. Sepala maris late ovalia, obtusa, albi- 
cantia vel interdum purpurascentia. Sepala feminei iis maris dimi- 
dio minora, magis herbacea. Anthere lineari-oblonge, acuminate. 
Achenia oblique oblongo-elliptica, sessilia. 
This small species inhabits dry prairie about Leeds, where it 
comes into flower late in May, maturing its fruit early in July. Dr. 
Lunell has distributed it under the name of 7. 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 which T. /Ayrsoideum most resembles is my T. cam- 
pestre 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 7. venulosum. 
Thalictrum Lunellii nov. sp. 
Planta dioica fere metralis, caule laete viridi, laevi, glaberrimo, 
folioso, foliis peramplis; 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, tur- 
gide 8-costata. 
This fine species, belonging to the group T. diot.um, confine and 
occidentale, was collected in July of this year (1909), in moist thick- 
ets of th e Souris River near Minot, North Dakota, by Dr. J. Lunell. 
Any one acquainted with the geography of North American 
y would naturally expect that a new Thalictrum from the 
