1909 The Ottawa Naturalist. 39 



being Geol. Surv. No. 841, a rank staminate plant in flower; 

 also from the same station and by the saine collector, June,' 

 1898, Geol. Surv. 59,615, the summit of a plant in mature "fruit; 

 also "Whirlpool Woods," Niagara, Ont., 9 May, 1901, Geol.' 

 Surv. 33,609, staminate plant in flower; Wingha'm, Ont., J A 

 Morton, May, 1891, Geol. Surv. 840. 



Numerous localities for the same type as occurring within 

 the United States need not here be cited. 



Thalictrum dioicum var. adiantinum. Leaves of a more 

 vivid and rather metallic green above, also marked with delicate 

 dark veins and veinlets ; both terminal and lateral leaflets more 

 slightly lobed primarily as well as secondarily, the secondary 

 extremely short and subtruncate, thrice, and even more than 

 thrice as broad as long: achenes a trifle shorter and notably 

 thicker than in the type, being 4 mm. long and of oval-elliptic 

 outline, the ribs very thick, turgid, broadly rounded, the inter- 

 vening furrows, when not nearly obsolete, very narrow and 

 sometimes deep. 



Southwestern Ontario, near St. Thomas, Mr. Macoun, 24 

 June, 1907, Geol. Surv. 72,515. 



The specimens of this quite remarkable and very handsome 

 meadow rue consist of the terminal portions of two fruiting 

 plants. The largest is a foot long, and shows but one of the 

 usually two or three leaves. The leaflets, no less clearly than 

 the achenes, indicate relationship of some more or less close 

 degree to the foregoing. If when flowers of plant become known, 

 especially the staminate, these show as much divergence from 

 the type as do the leaflets and the fruits, the rank of a distinct 

 species w411 be assured for it. 



Thalictrum dioicum, var. Huronense. Size and habit 

 perfectly as in the type, but leaflets almost v/ithout distinction 

 of primary lobes and secondary, being not very unequally 5-7 

 crenate-lobed: sepals of staminate flowers, more green-her- 

 baceous, purplish-edged, the veinlets faint; anthers much 

 elongated, longer than the filaments, greenish-yellow, pointless, 

 not even mucronulate but rather obtuse, or at least obtusish. 



Port Huron, Michigan, 4 May, 1896, Charies K. Dodge; the 



1^. type specimen being in Herb. Univ. of Wyoming. The remark- 



^ ably long and quite blunt anthers no less than the peculiar cut 



of the foliage mark this as a thing not to be confused with our 



ktype of T. dioicum. The fruit when known may confirm it in 

 the rank here assigned, or may demand its promotion. 

 There is a fragment of a pistillate specimen mounted with 

 the staminate, purporting to have been obtained a week later 

 in the same neighborhood; but the one leaf which this 

 fragment bears shows leaflets of a cut so extremely different that 



