KANUNCULTTS.] RANUNCULACErf. 5 



SECTIOX 1. Batra'cliium. 1 Water-plants. Leaves often submerged and 

 multifid ; stipules membranous. Peduncles usually leaf-opposed, 1-flowered. 

 Petals white ; gland naked, yellow, basal. Achenes transversely wrinkled. 



1. R. aquat'ilis, L. ; floating leaves or 3-lobed or -partite, sub- 

 merged 2-3-chotomously multificl, segments capillary or linear, stipules 

 broad, auricles free or 0, receptacle and sometimes the achenes more or 

 less hispid, stigma oblong. 

 Ponds and ditches, ascends to 1,500 ft. ; fl. May-Aug. A very variable plant. 



DISPRIB. All temp, regions, except New Zealand and the Pacific. 

 Sub-sp. HETEEOPHTL'LUS, Auct. (sp.) ; floating leaves rarely 0, submerged 



suborbicular, segments not in one plane, stipules broad adnate usually 



auricled, petals large mostly 7-9-nerved, stamens many. Also N. America 



and Arctic Europe. 



* Segments of svJbmeryed leaves rather rigid, spreading when removed from the 

 water. VAR. 1, peita'tus, Fries (sp.) ; floating leaves reniform 3-lobed to the 

 middle, peduncles long, receptacle spherical. VAR. 2, floribun'chis, Bab. 

 (sp.) ; floating leaves reniform 3-lobed to below the middle, peduncles about 

 as long as the leaves, receptacle spherical. VAR. 3, confu'sus, Godron 

 (sp.) ; floating leaves 3-foliolate, peduncles slender longer than the leaves, 

 receptacle ovoid. VAR. 4, Baudo'tii, Godron (sp.) ; floating leaves 3-partite, 

 segments cuneate, peduncles stout more slender upwards, receptacle ovoid. 

 R. aquatilis, var. Symei, Hook, and Arn. 



* * Seyments of submerged leaves collapsing, and forming a pencil when removed 

 from tlie\water. VAR. 5, heterophyl'lus proper, Fries (sp.); floating leaves 

 rarely 0, orbicular 3-lobed to or below the middle, segments cuneate ap- 

 proximate, peduncles rather slender about as long as the leaves, receptacle 

 conical. VAR. 6, pi>endo-jlu'itans, Syme (sp.); floating leaves 0, or 3-lobed 

 to or below the middle, segments of submerged very long, peduncles much 

 longer than the leaves, receptacle spherical. 



Sub-sp. PANTO'THRIX, Broteri (sp. in part); stem very slender, floating leaves 0, 

 rarely 3-partite or -foliolate, submerged 2-3-chotomously multifid, segments 

 not in one plane, stipules ^-adnate, auricles large, peduncles not tapering 

 about as long as the leaves, petals 5-7 -veined, stamens few, receptacle 

 globose or oblong. Ponds and ditches ; less common than heterophyllus. 

 VAR. 1, Droue'tii, Schultz (sp.); segments of submerged leaves collapsing 

 when removed from the water, buds oblong or obovoid. VAR. 2, tncho- 

 phyl'lws, Chaix (sp.) ; segments of submerged leaves spreading when re- 

 moved from the water, buds globose. 



Sub-sp. CIRCI'NATUS, Sifithorp (sp.) ; floating leaves 0, submerged orbicular 

 subsessile, segments rigid in one plane, stipules narrow altogether adnate 

 not auricled, petals much larger than the calyx 7-9- veined, stamens many, 

 receptacle oblong, style cylindric. Ji. diva'ricatus, Schrank. A small and 

 very distinct form, also N. American. 



Sub-sp. FLU'ITANS, LamL (sp.) ; floating leaves or 3-foliolate, submerged 

 cuneate, segments very long (6-10 in.) sub-parallel linear rigid, stipules 



1 The species of this section are considered by some authors as forms of one or 

 two, by others as 20 to 30. The comparative length of the stamens and carpels varies 

 with age ; and the shape of the achenes and styles varies with age and the position of 

 the achenes on the receptacle ; these characters are not valueless, but are almost unde- 

 finable. For the subspecies, &c., I have followed Syme ; who has, however, in the 1869 

 Report of the Botanical Exchange Club, so far modified his views, as to reduce the first 

 four to two. 



