anemone. RANUNCULACEvE. 11 



THALICTRUM. 



A. trift)lia L. Sp. i, 540. Involucral leaves with rare exceptions regular- 

 ly trifoliate; leaflets ovate-lanceolate, rather regularly serrate, large, in well de- 

 veloped specimens 2 to 3 inches long, and more than an inch wide; radical 

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

 ally more than 2 inches in length: flowers large, 15 to 16 lines in diameter: 

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

 Atlantic States and Europe . 



§ 3. Omalocarpus 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. narcissiflora 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 Rocky Mountains. 



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



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

 compound leaves and dktciousbr 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, whitish, soon reflexed: stamens 10-25, the short ex- 

 serted filaments widened to the pointless elliptical anthers : achenes 9-15, 

 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-lobed 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 

 lines 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 California. 



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 three divergent lobes, the central or all of them again 

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

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

 in the heads, snbstipitate, 2-3 lines long, obliquely oval or with the dorsal su- 

 ture straightish, thin-walled, flattened., with 8 to 10 prominent nearly parallel 

 ribs the median heaviest, not rilled by the oblong or linear seed. From the 

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

 Rocky Mountains. 



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

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

 r whitened: stem simple, erect, 7-20 inches high: stem leaves 2 or 3, long 



