AUEMQNE. RAN.UNCULACEiE. ■ 11 



THALICTKCM. 



A. trifolla L. Sp. i, 540. Involucral leaves with rare exceptions regular- 

 ly trifolifite; leafletBOvate-lanceolate,vatherregiilaiiyseiTate, large, in well de- 

 veloped" specimens 3 to 3 inches long, and more than ah inch wide; radical 

 leaves subsimilar, but sometimes 5-foliate: peduncle long and sleiider, -usu- 

 ally more' than 2 inches in length: flowers Jai'ge, 15 td 16 lines in diameter: 

 sepals white or pinkish : carpels in a globtilai' head. Idaho, Sandberg, to the 

 Atlantic States and Europe . 



§ a. Omalocarpds DC. Style short, not plumose. Mature ach- 

 enes smooth, orbicular, much compressed, wing-margined. Invo- 

 lucre sessile, palmately parted' or cleft. Peduncles 1-several. 



A. narclssiflora L. Sp. i, 542. Villous : radical leaves palmately 3-5- 

 parted ; segments cuneiform, incisely many-cleft into linear lobes : involu- 

 cral leaves similar, 3-5-cleft, sessile : peduncles several, umbelled, leafless : 

 sepals white : carpels roundish-oval, much compressed. Alpine : Idaho to 

 Alaska and the Eocky Mounta,ins. 



3 THALICTEUM Tourn. Inst. 270. L. Gen. n. 597. 



Tall, usually smooth perennial herbs with 2- or 3-ternately 

 compound leaves and dicjtciousor polygamous flowers in panicles.' 

 Sepals 4-8, white or greenish, petaloid. Petals .none. Stamens 

 several ; with linear anthers on rather long almost capillary fila- 

 ments. Pistils few-several, becoming ribbed or veined achenes 

 • that are tipped with the persistent style. 



T. sparsiflorum Turcz. .in,F. & M. Ind. Sem. i, 40. Stem firm, erect, 1- 

 6 feet high, with ascending branches : leaves 3-ternate, ample, the lowest 

 petioled ; leaflets approximate, short- petioled, thinnish, round- or spatulate- 

 oblong, 3-15 lines long, slightly cordate at base, divided above into 3 obtuse 

 or short-acuminate lobes that are again incised : flowers perfect, not large, 

 erect or soon nodding on slender pedicels in a short, branched, leafy pani- 

 cle: sepals obovate,\vhitish, soon reflexed: stamens 10-25, the short ex- 

 serted filaments widened to the pointless elliptical anthers : achenes 9-16, 

 short-stipitate, obliquely obovate, with 4 or 5 low, often, forked nerves on 

 each side. From the mountains of California to Alaska and Colorado- 



T. polycarpum Watson Bot. Cal. ii, 424. Stout, 3-8 feet high, glab- 

 rous : leaves with short petioles or the upper sessile ; leaflets variable, 3-12 

 lines long, 3-ldbed with acute or acuminate lobes : panicle narrow : flowers 

 dioecious ; the staminate usually crowded, on short pedicels ; anthers acute, 

 on very slender filaments : fruit in dense heads ; achenes compressed, 3-5 

 Unes long, on a short stipe, obovoid, turgid, tapering into a reflexed beak • 

 their thin walls with free, or anastomosing low veins : seed slender, terete, 



2 lines long. Along small streams from the Columbia river to Caliiornia. 



T. Fendleri Engelm. in Gray PI. Fendl. 5. Stems 1-3 feet high, with 



3 to 5 cauline leaves, the lower ones petioled; the stalked remote leaflets often 

 deeply cordate with thi-ee divergent lobes, the central or all of them agam 

 lohed, their divisions rounded or mucronate-pointed: flowers dioecious; stamens 

 numerous; anthers linear, 1-2 lines long, mucronate;akenesfew (o numerous 

 in the heads, substipitate, 3—3 lines long, obliquely oval or with the dorsal su- 

 tm'e straightish, thin-walled, flattened, with 8 to 10 prominent .nearly: parallel 

 rjbs the median heaviest, not filled by the oblong or linear seed. From the 

 Siskiyou mountains, in southern- Oregon, to Arizona, New Mexico, and the 

 Bocky Mountains. ' • 



T. Tenulosnm Trelease Proc. Bost. Soc. xxiii, 302. Glabrous and glau- 

 cous, the stem, petioles and sepals purple-tinted, the foliage typically pale 

 or whitened: stem simple, erect, 7-20 inches high: stem leaves 2 or 3' , ong 



