POLYANDRIA.— POLYGYNIA. 223 



IIAB. Woods. April — May. U . Root black, tub. ; 

 stem 6 in. high; Jl. wh. or purplish. 



2. A. lancifolia : leaves ternate ; leaflets lanceolate, 



crenate-dentate ; calyx 5-leaved, leaflets ovate, 

 acute ; stem 1 -flowered. 

 HAB. High mountains. May — July. U . Fl. wh. ; 

 fr. ovate, with a short uncinate style. 



3. A. pennsylvanica : leaves 3-parted ; lobes oblong, 



incisely toothed at the apex ; involucrum similar, 

 sessile, bearing several pedicels, one of which is 

 naked and 1 -flowered, the others in volucellate ; 

 fruit pubescent. 

 HAB. Meadows. June — July. If. A foot high ; 

 pedunc. elong. ; jl. yell.-wh., large. 



4. A. virginiana : leaves ternate ; segments 3-cleft, 



acuminate, incisely toothed ; involucrum similar, 

 petiolate ; leaflets of the calyx acuminate ; fruit 

 oblong. 

 HAB. Woods. July. U . Stem2ft.high;Jl.gr.~ 

 yell. ; cal. hairy ; caps, woolly. 



3G0. THALICTRUM. Meadow-rue. Ranunculace«. 

 * Stamens longer than the calyx. 



1. T. dioicum : very smooth; leaves decompound; 



leaflets roundish, with obtuse lobes, glaucous be- 

 neath ; filaments filiform ; flowers dioecious. 

 HAB. Rocky woods. April. U . Stem 2 ft. high ; 

 Jl. panic, rose-col. ; fr. oval, striate. 



2. T. pubescens : leaves decompound; leaflets ovate, 



3-lobed, minutely and densely pubescent beneath ; 

 margin revolute ; filaments filiform ; flowers poly- 

 gamous. 

 HAB. Wet meadows. June — July. U. Stem A — 

 5 ft. high ; Jl. in large pan. ; cal. decid. 



3. T. Cornuti : leaves decompound ; leaflets ovate, ob- 



tusely 3-lobed, glaucous and a little pubescent on 

 the veins beneath ; flowers dioecious ; filaments 

 cl.ivatc ; fruit sessile, striate. 

 HAB. Wet meadows. June — July. Stem 2— 5 //. 

 high; Jl. gr. -yell. +. 



4. T. rugosum: leaves decompound; leaflets o\ 



lanceolate, rugose, veined, obtusely lobed ; fl<-\\ 

 ious, filaments filiform. 



