8 R.YNUNCULACEJE. (CROWFOOT FAMILY.) 



7. R. TOCUrvatus, Poir. Hirsute; leaves all pctiolcd, 3 - 5-lobcd ; the 

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

 achenia in globose heads, pointed with a long and slender recurved l>eak. — Low 

 grounds. April and May. — Stem 1° -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 much larger than the calyx: achenia in glotiose heads. 



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

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



variously divided, ; sepals reflexed ; 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-lobcd; leaflets 3-lobed, toothed ; achenia strongly margined, pointed with the 

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

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

 swamps of the low country. March and April. 



Var. |?. hispiduS. Hirsute; stem erect; leaves ample; peduncles long, 

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

 Poir: the latter a form with softer pubescence.) 



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

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



12. R. palmatus, Ell. Hirsute with appressed hairs; haves 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. 

 (B Carolinianus, DC.) — Swamps in the pine barrens, Middle Florida to South 

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



13. R. blllbOSUS, L. Hairy; stem erect (l°-lA° high) from a bulb dike 



leaves ternate : leaflets 3 parted, with toothed lobe- ; those of the upper 



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



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



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



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

 toothed lob' ; the opp rmost 8 parted, with linear entire lobe- ; achenia pointed 

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

 Europe. 



