150 FLORA OF PHILADELPHIA. 



2. Clematis Viorna L; Leather flovier. M. p. 422. Bich soil. Early 



summer. ■■<■!!, 



Chester— (P.). Lancaster — York Furnace (St.). Berks — Monooacy 

 (Me.). i 



New Castle-^Mount Cuba, Burris Bun, Milltown, Commons \ Ashland. 



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

 1 Chester— London Grove (P.). 



16. ATEAGENE L. 



1. Atragene Americana Sims. Purple" Virgin's Bower. M. p. 423. Bocky 



■ >s places. Early summer. ... < 



Bucks— Burham, Bedminster (Fr.), Point Pleasant arid alorig Tohftdkbii 



Greek (Ws.). M ontgqmer.y — Schwenksville (Cr.) (Ja.), Chester — 



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



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



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



Ocean— Point Pleasant (Sts.). Somerset,— Peapack (C). Hunterdon 

 —On Delaware (C). , 



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



i.7. EANUtiTCULUS L. Buttercup, Crowfoot. 



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



leaves. 

 ■ > Achenes niarginless, flowers 7-14 mm. broad. . L M. •Purshvi,.,. . 



Achenes caljous-margined. 2. B. delphinifolius. 



**Plants of swamps or' muddy shores; leaves entire or denticulate: ■■■ 

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



, . 3. ii. pusillys. 



Perennials, rooting from the nodes; achenes beaked. 



Stems trailing; achenes minutely beaked. 4. B. reptang. 

 Stems ascending or erect;, achenes subulate beaked.,, 



5,. B.'obtusiuseulus. 

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

 1. Achenes smooth. 



Basal leaves, some or all of , them, merely crenaj;e. 



Basal leaves cordate; plant glabrous or nearly so. 



6. B. abortirtus. 

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



Leaves all lobed or divided. 



Plant glabrous; stem hollow; flowers very small. 



8. B. sceleratus. 

 Plants more or less pubescent. 



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



9. B. recupvatus. 

 Beak of the achene short. 



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

 Calyx spreading; roots fibrous. 



. 10. B. acris. 

 Calyx reflexed ; stem bulbous-thickened at base. 



11. B. bulbosus. 

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

 broad. 12. B. Pennsylvanicus. 



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



13. B. repens. 

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

 broad. 



