10 RANUNCULACE^. 



river. May — July. %.. — Stem 12 — 15 inches high. Flowers small, pale yel- 

 low, on short peduncles, Sanicle-leaved Crowfoot. 



15. R. fascicularus Muhl.: stem erect, branched; leaves on long peti- 

 oles, pubescent, pinnately divided ; the lobes oblong, obovate, pinnatifid ; 

 calyx spreading, shorter than the petals, villous ; carpels orbicular, (Uowned 

 with a slender subulate style, collected into a sub-globose head. 



Woods. Can. to Penn. W. to Miss. April, May. % — Root fascicled. 

 Stem 6 — 12 inches high. Flowers about as large as those of R. acris, pale 

 yellow. Varies considerably in the form of its leaves, which are however al- 

 ways much more compound than is usual in this genus. 



Bundle-rooted Crowfoot. 



16. B. bulbostis Linn. : stem erect, hairy, bulbous at the base; leaves ter- 

 nate, or quinate-pinnate ; leafets 3 — 5-parted, segments trifid or incised ; 

 peduncles sulcate ; calyx reflexed, hairy ; carpels in a globose head, with 

 a short recurved beak. 



Meadows. May — Aug. %. — Root consisting of thick fibres, tuberous at the 

 neck. Stem about a foot high. Petals usually 5, deep yellow and shining. 

 Medicinal. -See Big. Med. Bot., III. 61. Introduced from Europe. 



Butter-cups. 



*** Carpels aculeate or tuber culate. 



" 17. /?. muricatus Linn. : stem erect or diffuse ; leaves smooth, petiolate, 

 suborbiculate, 3-lobed, coarsely dentate ; peduncles opposite to the leaves ; 

 calyx spreading ; carpels tuberculate-aculeate,. terminated by an ensiform 

 beak. 



Alleghany mountains. Drummond. S. to Louisiana. May — ^July. %.. — 

 Leaves sometimes undivided. Flowers small. Petals obovate, bright yellow. 

 Introduced ? Muricate Crowfoot. 



7. CALTHA. Linn.— Marsh MaVigold. 

 (From the Greek Ka\Sdos a basket: in allusion to the form of the flower.) 

 Calyx colored, with 5 — 10 roundish sepals resembling pe- 

 tals. Petals none. Stamens numerous. Ovaries 5 — 10. Fol- 

 licles compressed, spreading, many-seeded. 



1 . C. palustris Linn. : . stem succulent, erect ; leaves cordate, saborbicu- 

 lar, obtusely crenate, petiolate ; flowers large, pedunculate ; sepals broad 

 oval. 



var. integerrima Torr. <^ Ch: : radical leaves entire ; floral ones sessile, 

 obscurely crenate ; petals obovate. C. integerrima Pursh. 



In swamps. Can. to Car. W. to Miss. Labrador to the Columbia river. 

 April, May. %. — Root of coarse fasciculate fibres. Stem 6 — 12 inches high, 

 erect, somewhat succulent, dichotomously branched above. Leaves large and 

 shining. Flowers few, an inch or more in diameter, bright yellow. 



Common Marsh Marigold. 



2. C. parnassifolia Raf. : stem erect, l-flowered, 1-leaved ; radical leaves 

 petiolate, lanceolate-cordate, very obtuse, many-nerved; sepals elliptical, 

 styles 5 — 8. C. ficaroides Pursh. C. palustris, var. parncLSsifoUa Torr, 

 ^ Gr. ■ mb 



