Dicotyls or Exogenous Plants. 47 



Ra-nun'-cu-lus re-cur-va'-tus Poir. Hooked Crowfoot. — Hirsute; leaves 

 long-petioled, deeply ;5-cleft, large ; petals shorter than the reflexed. 

 cal\-x, pale. 



c. styles long and attenuate, stigmatose at /lie tip}] 



Ra-nun'-cu-lus fas-cic-u-la'-ris Muhl. Early Crowfoot. — Pubescent with 

 close-pressed silky hairs ; lateral divisions of the radical leaves sessile; 

 carpels scarcely margined. 



Ra-nun'-cu-lus sep-ten-tri-o-na'-lis Poir. Northern Crowfoot. — Hairy or 

 nearly glabrous; leaves J^-divided, the divisions usually stalked ; carpels 

 strongh' margined. 



c. style subulate, stigmatose along the inner inargin.)) 



Ra-nun'-cu-lus re'-pens I,. Creeping Crowfoot. — Closely resembling 

 the last species ; leaves often white-variegated or spotted ; com- 

 mencing to flower somewhat later. 



Ra-nun'-cu-lus penn-syl-van'-i-cus L,. f. Bristly Crowfoot. — Stout, erect; 

 hirsute with widely spreading bristly hairs ; leafy to the top ; 2 ft. 

 high; flowers inconspicuous; head of carpels oblong. 



Ra-nun'-cu-lus his'-pi-dus Mx. Hispid Crowfoot. — Resem1)ling the last 

 but the ascending or reclining stems few-leaved, not always hirsute . 

 head of carpels globo.se or oval. A northern species reported for Ohio, 



Ra-nun'-cu-lus bul-bo'-sus Iv. Buttercups: Bulbous Crowfoot. — Hairy' 

 stem erect, 1 ft. high, from a bulbous base; radical leaves 3-divided, 

 the lateral divisions sessile ; peduncles furrowed. 



Ra-nun'-cu-lus ac'-ris L. Buttercups; Tall Crowfoot. — Hairy, stem 

 erect, 2-3 ft. high ; leaves 3-divided, the divisions all sessile ; peduncles 

 not furrowed. 



17. Genus BA-TRA'-CHI-UM. — Sepals 5, the 5 petals each with a 

 spot or naked pit at base, white or only the claw yellow ; aquatic or 

 sub-aquatic plants with the immersed leaves repeatedly dissected into 

 filiform divisions. 



Ba-tra'-chi-um di-var-i-ca'-tum (Schrk.) Wimm. (Ranunculus circina- 

 tus Sibth.) Stiff White Water Crowfoot. — Leaves sessile, the divisions 

 short, spreading in one roundish plane, rigid, not collapsing when 

 withdrawn from the water. 



