8 BANUNCULACEiE. (CROWFOOT FAMILY.) 



7. R. recurvatus, Poir. Hirsute; leaves all pctioled, 3 - 5-lobcd ; the 

 lobes wedge-shaped, sharply toothed ; petals minute, shorter than the calyx ; 

 achenia in globose heads, pointed with a long and slender recurved beak. — Low 

 grounds. April and May. — Stem l°-2°high. 



8. R. SCeleratUS, L. Smooth ; leaves 3-parted, with the divisions wedge- 

 shaped, obtusely lobed and toothed ; the uppermost sessile ; petals as long as 

 the calyx ; achenia in oblong or cylindrical heads, pointless. — Ditches and 

 swamps, Charleston {Elliott). Introduced from Europe. April and May. — Stems 

 thick, 1° high. 



9. R. Pennsylvanicus, L. Hirsute ; leaves ternate ; leaflets long- 

 stalked, 3-parted, the divisions lanceolate, acutely lobed and toothed ; petals 

 shorter than the calyx ; achenia in oblong heads, pointed with a broad straight 

 beak. — Low grounds in the upper districts. June. — Stem 2° - 3° high. Pe- 

 tioles elongated, very hairy. 



++ ++ Petals vnich larger than the. calyx : achenia in globose heads. 



10. R. Purshii, Richardson. Stem floating ; immersed leaves divided 

 into very numerous capillary segments, emersed ones rcniform, 3- 5-partcd, the 

 lobes variously divided ; sepals reflcxed ; achenia pointed with a short straight 

 beak. — In Stillwater, North Carolina and northward. May -July. — Stems 

 2° -4° long. 



11. R. repens, L. Smooth or hairy; leaves ternate, or the earliest ones 

 3-lohed ; leaflets 3-lobed, toothed ; achenia strongly margined, pointed with the 

 broad and straight or slightly-curved beak ; stems erect or prostrate, often bear- 

 ing long runners. — Rich soil, chiefly in the upper districts. Var. y in the river 

 swamps of the low country. March and April. 



Var. (9. hispidus. Hirsute ; stem erect ; leaves ample ; peduncles long, 

 with the hairs appressed. (R. hispidus, Mr. R. Marilandicus and tomentosus, 

 Poir: the latter a form with softer pubescence.) 



Var. y. nitidus. Smooth or nearly so; stem prostrate (l°-2°long); 

 leaves and flowers smaller. (R. nitidus, Muhl.) 



12. R. palmatUS, Ell. Hirsute with appressed hairs ; leaves small (1' 

 wide), ternate or 3-parted, with the divisions ovate, sparingly toothed, those of the 

 upper leaves lanceolate and entire ; achenia strongly margined, straight-beaked. 

 (R, (aroliiiianus, DC.) — Swamps in the pine barrens, Middle Florida to South 

 Carolina, rare. — April and May. Stems 1° high. 



13. R. bulbosus, L. Hairy; stem erect (1°-U° high) from a bulb-like 

 base ; haves ternate ; leaflets 3-parted, with toothed lobes ; those of the upper 

 leaves lanceolate, entire; flowers large (l'wide); achenia pointed with a short 

 recurved beak. — Low grounds in the upper districts. Introduced. May. 



14. R. acris, L. Hairy; stem tall (2° -3°), branched above; leaves 

 3-parted, the divisions deeply cut into three wedge-shaped or lanceolate, acutely- 

 toothed lobes : the uppermost 3-parted, with linear entire lobes ; achenia pointed 

 with a short recurved beak. — Low waste places, sparingly introduced from 

 Europe. 



