POLTANDRIA. PoLTGYMA. 21 



Stipules at the base of t!ie leaves, and involucrum covered 

 with a dcns'_- and suit silky pubescence. Leaves 4 or 5- 

 parted, sei^ments cuneate, once or twice clet't, ultinriate 

 divisions bitid or trifid, linear, acute, 1 or 2 lines \vide, 

 primary segments about 2 inches loni,'-. InvoJucrum cup- 

 Siia[jed, subulately dissected. Petals 6, (never 4,) exter- 

 nally Silk}-, of a pale dull blue inclining- to violet, about 

 an inch lont^, expanding- nearly flat af;out inid-day. Seeds 

 caudate, and plumose, cauda near 2 iiU'hes. (^. puiena is 

 oidy about 4 jiches hii^h; with tfifi 1 leaves, segments 5-cleft, 

 s:n()oLh with capillary acunninations: involucell approxi- 

 mating towards the flover; petals white, larger.) 2. «e- 

 morosa. 3. ia.nc{f:jl:a. Ph. Is this plant sufficiently dis- 

 tinct from the preceding? 4 cnneifolia. 5. tenella. Ph. 

 Obs. Root bidbous; scape 1-tiowered, involucrate, 4 to 6 

 Inches high. Leaves smooth, ternate, leaflets trifid, 

 toothed. Involucrum 3-parted, segments cuneate, 3-lobed, 

 entire. Petals linear-oblong, 12 to 14, white or blue, 



often elegantly maculate, seeds woolly, but not caudate 



Flowering in April. Hab. In elevated plains around the 

 Maha village on the Missouri. \evy nearly allied to A. ap- 

 penina. 6. tJuilictPoides. 7. itarcissifiora. 8. pensylvani' 

 ca. 9. dUhotoma. 10. -Jrginiaiia. Seeds remarkably lanu- 

 gmous towards the base. 



A genus of near 40 species, principally European, ex- 

 tending into Siberia, Barbary and the Levant; there are 

 also species in Japan, Brasil, and as far as La Plata in 

 Soulli America. 



S85. THALICTRUM. L. (Meadovv-Rue.) 



Calix none. Petals 4 or 5. Stamina very 

 long. Seeds ecaudate, striate, terete. 



Herbaceous; leaves twice or thrice ternate, leaflets 

 Tnosil) trilid or 3-lobed; flowers in terminal panicles; the 

 American species are mostly dioicous, or polygamous. 



Species. 1. T. Comuti. 2. dloicum. o. vugosum. 4. 

 Albescens. 5. piirpurascens. 6. runuticvlmutn. 



A genus of near 30 species, almost peculiarly indige- 

 nous to Xorth America and Europe; there is also 1 spe- 

 cies in Japan and 3 in Siberia. 



386. HYDRASTIS. />. 



Calix none. Petals 3. Xedarij none. Bcr- 

 vij compound, granulations l=secdeil. 



