Vor. II.] CROWFOOT FAMILY. 87 
2. Thalictrum clavatum DC. 
Mountain Meadow-Rue. 
(Fig. 1633.) 
Thalictrum clavatum DC. Syst. 1: 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 cymose; 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 1. Early 
Meadow-Rue. (Fig. 1634.) 
Thalictrum dioicum I,. Sp. Pl. 545. 1753- 
Glabrous, erect, 1°-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; flowers 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. Thick-leaved Meadow-Rue. 
(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. 
