162 



THK JOURNAL OF BOTANY 



^Leaves ^ divided, not undulate; cells becoming gradaally smaller 



towards the margin, which is usn. entire comiiacta 



Leaves ^divided, entire and undulate, or dentate; cells punctate, 

 becoming suddenly and distinctly smaller towards the margin : 



leaves softer subalpina 



y j Margin of leaves commonly entire or nearly so 7 



(Margin of leaves ciHate or dentate 11 



rAnt. lobe reniform, very convex, about three times smaller than 



7-1 post, lobe idiginosa 



(Ant. lobe not reniform, usu. about h size of post, lobe 8 



gj Plant small, about h in. or less ; on banks or rock-ledges 9 



(Plant larger; usu. in marshes or on wet rocks 10 



/Stems slightly radiculose, leaves rather remote, little accrescent, ant. 



9 J ^ Jobe rectangular-ovate, per. ciHate : on banks and ditch-sides... c«/-^(r 



j Sterns densely radiculose, leaves close, accrescent, ant. lobe ovate, per. 



' sinuate-dentate, or entire ; on rock-ledges rosacea 



(Cells of leaf, except at its base, nearly equal in size, cell-walls rather 

 thick; ant. lobe usu. with an incurved point irrigua 

 Cells of centre of leaf twice as large as those at the apex, cell-walls 

 thin; ant. lobe usu. rounded undulata 



j^jMargin of leaves ciliate 12 



(Margin of leaves dentate or serrate 14 



j2 J Post, lobe flat, horizontal ornithopodioides 



"" (Post, lobe convex, erecto-patent 13 



^ J Lobes § divided with straight cilia; plant green nemovosa 



13 j Lobes divided to base with irreg. curved spinous cilia ; plant reddish 

 \ nimbosa 



14] Both lobes acute and acutely serrate umbrosa 



(Post, lobe at least obtuse, lobes not serrate 15 



I' Mature leaves ochraceous or yellowish brown; ant. lobe reniform- 



jg ) rotund, frequently reflexed resiipinata 



I Leaves green or reddish, rarely ochraceous ; ant. lobe subquadrate to 



V rotund, more rarely reflexed 16 



-^g I Bracts nearly equal; plant soft undulata 



(Ant. bract \-l size of post, bract; plant firm 17 



(Leaves dentate ; on wet rocks .parpurea 



17 -j Leaves spinous-dentate or denticulate, usu. of a lighter colour, ant. 

 i lobe usu. more acute ; on drier rocks intermedia 



DIPLOPHYLLUM. 



^ I Leaves with a line of elongated cells in the centre albicans 



(Leaves without such line 2 



2 (Lobes of leaves acute Dicksoni 



"" (Lobes usu. obtuse 3 



3 1 P^i'picous or monoicous ; low ground plant obtaslfoliimi 



(Dioicous; alpine plant taxifollum 



LOPHOCOLEA. 



X I Upper stem leaves usu. entire or emarginate; ipa^ro'icous. . .heterop)hylla 

 (Upper stem leaves never entire; leaves whitish, translucent 2 



2 (Leaves irregularly toothed spicata 



(Leaves usu. regularly 2-toothed, teeth longer 3 



^ (Dioicous bidentata 



3 j Monoicous ; teeth longer and straighter, fertile stems more branched 



V cKspidata 



