86 



RANUNCULACEAE. 



Vol. II. 



2. Caltha flabellifolia Pursh. Mountain 

 Marsh-marigold. Fig. 1854. 



Caltha flabellifolia Pursh, Fl. Am. Sept. 390. 1814. 

 Caltha palnstris var. flabellifolia T. & G. Fl. N. A. i : 27. 



Weak, slender, reclining or ascending, l°-i4° 

 long, glabrous. Basal leaves 2-4' broad, long- 

 petioled, flabelliform or reniform, with a wide open 

 sinus ; the upper sessile or short-petioled, similar 

 or with truncate bases, all crenate or dentate ; flow- 

 ers yellow, 6"-9" wide, solitary or 2-3 together; 

 sepals oval; achenes 4-10, about 4" long, com- 

 pressed. 



In cold shaded mountain springs, Pocono plateau of 

 Pennsylvania and northern New Jersey to Maryland 

 and recorded from New York. Strikingly different 

 from the preceding in habit and appearance. June- 

 July. 



3. Caltha natans Pall. Floating Marsh- 

 marigold. Fig. 1855. 



Caltha natans Pall. Reise Russ. 3: 284. 1776. 



Stems slender, floating or creeping in wet places, 

 rooting at the nodes, 6'-i8' long, branching. Lower 

 and basal leaves slender-petioled, cordate-reniform, 

 1-2' wide, crenate or entire, thin, cordate with a 

 narrow sinus; upper leaves short-petioled, smaller; 

 flowers white or pink, s"-g" broad ; sepals oval, ob- 

 tusish ; follicles several or numerous, rather densely 

 capitate, about 2" long, the beak short and straight. 



In pools and streams, Tower, Mich., Athabasca, arctic 

 America and northern Asia. Summer. 



3. TROLLIUS L. Sp. PI. 556. 1753. 



Erect or ascending perennial herbs, with palmately divided or lobed leaves, thickened 

 fibrous roots, and large usually solitary yellowish, white, or purplish flowers. Sepals S-IS> 

 petaloid, deciduous. Petals 5-00, small, unguiculate, linear, with a nectariferous pit at the 

 base of the blade. Carpels 5-=o, sessile, many-ovuled, forming a head of follicles in fruit. 

 Stamens numerous. [Old German, trol, something round.] 



About 12 species, mainly inhabiting marshy places, natives of the north temperate zone. Besides 

 the following, another occurs in western North America. Type species : Trotliiis enropaeus L. 



