Voi,. II.] 



CROWFOOT FAMILY 



2. Thalictrum clavatum DC. 



Mountain Meadow-Rue. 



(Fig. 1633.) 



Thalictrum clavatum DC. Syst. i: 171. 1818. 



Glabrous, branching, 6 / -24 / high. Leaves 

 oval, ovate, or the terminal obovate-cuneate, 

 basal and cauline, large, biternate; leaflets 

 thin, stalked, with 3 main lobes and a few sec- 

 ondary ones, their margins not revolute; in- 

 florescence cytnose; flowers perfect; filaments 

 spatulate and petal-like; anthers oblong, 

 blunt; achenes spreading, equalling their 

 stipes or longer, obliquely ovoid, narrowed 

 at each end, flattened; stigma minute. 



Mountains of Virginia and West Virginia to 

 Alabama and Tennessee. May-June. 



3. Thalictrum didicum L. Early 



Meadow-Rue. (Fig. 1634.) 

 Thalictrum dioicum L. Sp. PI. 545. 1753- 



Glabrous, erect, i-2 high, slender, leafy. 

 Roots not yellow; leaves 3-4-ternate; leaflets 

 thin, pale beneath, orbicular or broader, often 

 cordate and the terminal one somewhat cune- 

 ate, 5~9-lobed; flo'wers dioecious, greenish, 

 drooping or spreading; panicle elongated, of 

 numerous lateral corymbs or umbels; filaments 

 longer than the sepals; anthers linear, blunt, 

 longer than the filaments; stigma elongated; 

 achenes ovoid, sessile or minutely stipitate, 

 deeply grooved, much longer than the style. 



In woods, Labrador and Anticosti to Alabama, 

 west to Saskatchewan and Missouri. Ascends to 

 4500 ft. in North Carolina. April-May. 



4. Thalictrum coriaceum (Britton) Small. 



(Fig. 1635.) 



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 rootstocks 

 and roots bright yellow. Stem striate, 

 paniculately branched above; leaves 3- 

 4-ternate, short-petioled, the lower peti- 

 oles expanded at the base into stipule-like 

 appendages; leaflets obovate or reniform- 

 orbicular, coriaceous, nearly white be- 

 neath, 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; pistil- 

 late flowers purple; achenes oblong-ovoid , 

 subacute, stalked, sharply ribbed, longer 

 than the persistent style. 



In open places, mountains of southwest- 

 ern Virginia, North Carolina and Kentucky. 

 May-June. 



Thick-leaved Meadow-Rue. 



