VjENUS 24. 



CROWFOOT FAMILY. 



119 



3. Thalictrum coriaceum (Britton) Small. Thick-leaved Meado \v-Rue. 



Fig. I934- 



Thalictrum dioicum var. coriaceum Britton, 

 Bull. Torr. Club 18 : 363. 1891. 



Thalictrum coriaceum Small, Mem. Torr. Club 

 4: 98. 1893. 



Tall, 3-5 high, the large roptstocks and 

 roots bright yellow. Stem striate, panicu- 

 lately branched above; leaves 3-4-ternate, 

 short-petioled, the lower petioles expanded 

 at the base into stipule-like appendages ; 

 leaflets obovate or reniform-orbicular, cori- 

 aceous, nearly white beneath, usually deeply 

 and sharply incised, the veins prominent on 

 the lower surface ; flowers dioecious, the 

 staminate nearly white, the anthers linear, 

 subulate-tipped, longer than the filiform 

 filaments; pistillate flowers purple; achenes 

 oblong-ovoid, subacute, stalked, sharply 

 ribbed, somewhat longer than the persis- 

 tent style. 



In open places, Pennsylvania to Virginia, 

 North Carolina and Tennessee. May-June. 



4. Thalictrum caulophylloides Small. Cohosh 

 Meadow-Rue. Fig. 1935. 



Thalictrum caulophylloides Small, Bull. Torr. Club 25 : 

 136. 1898. 



Tall, 2j-5J high, the creeping rootstocks and 

 the roots, pale. Stem finely striate, rather widely 

 branched above ; leaves 3-4-ternate, very short- 

 petioled, with the stipular appendages smaller than 

 in T. coriaceum; leaflets thinnish, but firm, broadly 

 oval, suborbicular or somewhat reniform in outline, 

 larger than in T. coriaceum, the terminal ones wider 

 than long, all 3-5-lobed, pale or glaucous beneath; 

 flowers dioecious, the staminate greenish, the anthers 

 narrowly linear, larger, longer- and more slender- 

 tipped than in T. coriaceum; pistillate flowers 

 greenish-purple; achenes elliptic, acute, decidedly 

 stalked, sharply ridged, much longer than the per- 

 sistent style. 



On mountain sides and river banks, Maryland and 

 Virginia near the District of Columbia and in eastern 

 Tennessee. May-July. 



5. Thalictrum revolutum DC. Waxy 

 Meadow-Rue. Fig. 1936. 



Thalictrum revolutum DC. Syst. i: 173. 1818. 

 T. purpurascens var. cerifcrum Austin ; A. Gray, Man. 

 Ed. 5, 39. 1867. 



Stem mostly stout, often purplish, 3-7 high, 

 glabrous or nearly so. Leaves 3-4-ternate, the lower 

 petioled, the upper sessile or short petioled ; leaflets 

 firm in texture, ovate to obovate, i-3-lobed above 

 the middle or entire, dark green above, paler and 

 waxy-resinous or glandular-pubescent beneath, their 

 margins somewhat revolute ; flowers dioecious or 

 polygamous; filaments capillary or slightly thick- 

 ened above, twice as long as the linear anthers, early 

 drooping; achenes very short-stipitate or sessile, 

 ridged. 



Woodlands, thickets and river-banks, Massachusetts 

 to South Carolina, Ontario, Tennessee and Missouri. 

 May-June. Plant strongly odorous. 



