56 LEAFLETS. 



late in nearly full grown fruit. The herbage does not in the 

 least blacken in drying, though the immature achenes have 



blackened. 



By the care with which Mr. Bissell gathered and pressed 



these complete plants, I feel assured that the male and female 

 represent the same species precisely, and by their completeness 

 they demonstrate fully how the foliage between a male and a 

 female may differ, as well as how on the same individual the 

 lowest leaves may be perfectly glabrous, the others very nota- 

 bly pubescent. 



Thauctrum viRiDE. Tall and robust, the ample sub- 

 corymbose fruiting panicle nearl}^ a foot in breadth ; whole 

 plant, even to the mature carpels, of a deep green, in no part 

 dull or dark when dry ; petiolules with a few hairs, all other 

 parts glabrous ; leaves ample and open, one of the cauline 9 

 inches long and (from tip to tip of the basal pinnae) 15 inches 

 broad, the primary petiolules 3 or 4 inches long below the 

 first leaflets, all the petiolules primary and secondary very 

 firm, leaflets very firm, light-green above, with veins still 

 lighter, beneath paler and more prominently veiny ; terminal 



leaflets of round-oval general outline, 1 to 1/^ inches long, 

 obtuse at base, the apex with one large and two small lobes 

 all mucronate-acute ; laterals mostly similar but small, only 

 a few oval and entire : achenes about X inch long including 

 style and short thick stipe, thick-fusiform, the thickest ribs 

 often showing a few small setaceous erect hairs. 



Type specimens, in U. S. Herb., from Waterbury, Con- 

 necticut, where they were collected by C. G. Du Bois, 30 

 Aug. 1888. 



Thai^ictrum SETUI.OSUM. Plant stoutish, a yard high or 

 taller, the stems smoothish and quite glabrous throughout : 

 leaves of firm texture, glaucous-green above, more glaucous 

 beneath, both faces in a degree, but chiefly the lower, 

 minutely and sparsely setulose-hairy : terminal leaflets of 

 lower leaves more than an inch broad and long, rounded or 

 subcordate at base, somewhat deeply 3-lobed, the middle lobe 



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