. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. *>jENUS 24. CROWFOOT FAMILY. 119 3. Thalictrum coriaceum (Britton) Small. Thick-leaved Meadovv-Rue. Fig. 1934. Thalictrum dioicum var. coriaceum Britton, Bull. Torr. Club 18: 363. 1891. Thalictrum coriaceum Small, Mem. Torr. Club 4: 98. 1893. Tall, 3°-S° high, the large rootstocks and roots bright yellow. Stem striate, panicu- lately branched above; leaves 3
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. *>jENUS 24. CROWFOOT FAMILY. 119 3. Thalictrum coriaceum (Britton) Small. Thick-leaved Meadovv-Rue. Fig. 1934. Thalictrum dioicum var. coriaceum Britton, Bull. Torr. Club 18: 363. 1891. Thalictrum coriaceum Small, Mem. Torr. Club 4: 98. 1893. Tall, 3°-S° high, the large rootstocks 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, 2i°-^i° 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-S-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 st
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