150 FLORA OF PHILADELPHIA. 



2. Clematis Viorna L. Leather-flower. M. p. 422. Rich soil. Early 



summer. 

 Chester — {^ .) . Lancaster— York Furnace (St.). 5erA's— Monocacy 

 (Me.). 

 New Castle — Mount Cuba, Burris Run, Milltown, Commons; Ashland. 



3. Clematis ochroleuca Ait. M. p. 422. Early summer. 



Chester — London Grove (P.). 



16. ATRAGBNE L. 



1. A.TRAGENE Americana Sims. Purple Virgin's Boa-er. M. p. 428. Rocky 

 places. Early summer. 



Bucks — Durham, Bedminster (Fr.), Point Pleasant and along Tohickon 

 Greek (Ws.). Montgomery — Schwenksville (Cr.) (Ja.). Chester — 

 French Creek Falls (Ja.) (Mac). Lancaster — York Furnace (Cr.) (Le.) 

 (Mac), Fulton Twp. (Ca.), banks of Susquehanna (W. Tr.). Lehigh — 

 Rockdale, Lehigh Gap (Kr.). Northampton — (P.). Berks — (P.). 



Ocea;( — Point Pleasant (Sts.). Somerset— PeapRck (C). Hunterdon 

 — On Delaware (C). 



New Castle — Mount Cuba (Cr.), above Wooddale, Commons. 



17. RANUNCULUS L. Buttercup, Crowfoot. 



*Aquatic or creeping mud plants with palmately lobed^ divided or dissected 

 leaves. 

 Aehenes marginless, flowers 7-14 mm. broad. 1. li. Purshil. 



Achenes callous-margined. 2. R. delphinifolius. 



**Plants of swamps or muddy shores; leaves entire or denticulate. 

 Annuals; achenes beakless; tipped with the persistent style-base. 



3. E. pusillus. 

 Perennials, rooting from the nodes ; achenes beaked. 



Stems trailing; achenes minutely beaked. 4. R. reptans. 

 Stems ascending or erect; achenes subulate beaked. 



5. R. oittisiusculus. 

 ***Terrestrial species with some or all of the leaves lobed or divided. 



1. Achenes smooth. 



Basal leaves, some or all of them, merely crenate. 



Basal leaves cordate; plant glabrous or nearly so. 



6. R. abortivus. 

 Basal leaves not cordate; plant villous. 7. R. micranthus. 



Leaves all lobed or divided. 



Plant glabrous ; stem hollow ; flowers very small. 



8. R. sceleratus. 

 Plants more or less pubescent. 



Beak of the achene strongly hooked; flowers 8-10 mm. wide. 



9. R. recibrvatus. 

 Beak of the achene short. 



Erect plants naturalized in fields ; flowers 25 mm. broad. 

 Calyx spreading; roots fibrous. 



10. R. acris. 

 Calyx reflexed ; stem bulbous-thickened at base. 



11. R. bulbosus. 

 Erect or ascending plants of moist soil ; flowers 6-12 mm. 



broad. 12. R. Pennsylvanicus. 



Ascending and creeping by stolons ; flowers 2.5 cm. broad. 



13. R. repens. 

 Beak of the achene long; stout or slender flowers 12-36 mm. 

 broad. 



