COULTEK AND KUSJE NOUTll AMKKKAN UMBKLLIFKKAK. 



on 



im, 1 15. 



izia, UO. 



bes, UMi. 



DUH rilis. 

 ala, 1U>. 



um, 1L'!I. 



lus, no. 



neon, 7<). 

 lum, 174. 



irtuin, 80. 



opsis, 8.'{. 

 lit. 



weya, 7^». 

 genia, 71^. 



hnia, 1()0. 



i. continent 

 erus, !()(>. 

 r less jjun- 

 yxia, 170. 



genia, <•>. 



Btera, 125. 

 nidia, 109. 



)genia, 74. 



arum, 140. 



surum, 84. 

 Slum, 114. 



I 



■■••0 



NATIVE (;i:XKI{A AM) SIMXIKW. 

 1. HYDROCOTYLE L. Sp. IM. 1: •2^^^. 175;?. 



Ciilyx t(M'tli iiiiiiiitc or obsolete. Fruit mon^ orlessoi-hicular. stronti-ly 

 flattciH'd liitfrully. Ciirpcl with the priiiiiiry ribs. 1 he dorsal lUiirj^nniil, 

 hi'oad or liiit'oriii: ititci-- 

 iDcdiatcs liliforiii (I'arcly 

 obsolete), usually curNcd; 

 laterals illifoi'iu or broad, 

 distinct from those of the 

 otliei" cai'ljel or eoiillueut; 

 a pi'oiuinent oil-beariiij^ 

 layer beneath tiie epider- 

 mis, oecaslonally contain- 

 injjf small oil tubes, and 

 usually a thick layei' of 

 streni^theniii«i' cells sur- 



rou.ldilljr the ^i^Vi\ cavity. ^,,., i._,i.v.lro..otyl.. ,.u.u..,t,c „, V i„; ,,, V .,,, 



Low herl)ai'e()us ])er(Mi- 

 nials jrrowini;' in or near water, with slendtM' cn'epini;' stems, ort)icular- 

 l)t>ltat(> or reniform leaves, and small white Howers in simj)l(5 or pi-o- 

 liferous umbels without involucre. 



First spcM'ies cited. If. rnh/drls L. 



A j^'cmis widely distributed in both iiemis])heres, containing- about 

 7;") spei'ies, !> of which are found in the United States and Canada. 



Fruit witli iRTicarj) tliin except at tlic broiul tliick corky dorsal and lateral ribs; 

 involucre of siiort ovate hi'acts; leaves orhicular-pellate, crenate; peduncles 

 as lon^as jietioles, both from slender creeping root.stocks. 

 Fruit notciu'd at base and apex. 



Umbels simple 1 . If. uiiiliilhiln. 



I'mbels proliferous. 

 I'mbels few. 



Dorsal ribs very obtuse; California L*. If. jiroliffvu. 



Dorsal ribs ratber acute; Atlantic coast 15. ff. cdiiliiii. 



rud)els mnuerdus in a j)n)fusely l>rancbing intlonwence. . . 4. //. /(o;»ovV/(,sw'.t. 

 Fruit not notclied. 



Fruit not cuneate at base. 



Fruit snbsessile .'"). //. rcrtirUlittit. 



Fruit pedicellate (i. //. (tHxlntl'ix. 



Fruit cuneati' at liast' 7. If. cuueaUi. 



Fruit with pericari) uniforndy corky-tliickeni'd and ribs all liliforni; leaves not pel- 

 tate; pedunclcH nuich shorter than petioles. 



Leaves thin, with nhort petioles; umbels sub.sessile 8. //. (nncricdiKi. 



Leaves thicker, with elon<,'ated petioles; nnd)els lu'dnncled .. it. //. rKiiiiin'uloidi'.'^. 



1. Hydrocotyle umbellata L. Sp. PI. 1: !>:U. 175:^. 



JI. HinfM'llulatdmvhx. Fl. Hor. Am. 1: Itil. 180;}. 



Descendin^r bninches of the rootstoek witii round tubei-s; umbel."* 



many-flowered, simple (rarely slij>htly proliferou.s); ptidieels 4 to 12 



