140 RANUNCULUS HETEROPHYLLUS. \_May, 



carpels glabrous, shining, swollen, not bordered, rhomboid-ovate ; 

 stigma thick, becoming a short beak, compressed, little curved, 

 evanescent. 



R. radians, Revel. Stem hollow, branched ; submerged leaves 

 stalked, their segments flaccid, circular in outline ; floating leaves 

 velvety beneath, orbicular, deeply cut into radiating segments, 

 some of them cuneiform-toothed or cut into lobes, the others 

 with short stalks, laciniate ; petioles dilated into membranous, 

 downy, auriculate stipules ; peduncles shorter than the leaves or 

 nearly equalling them ; calyx spreading ; receptacle spherical, 

 hairy ; petals obovate, narrowed at their base, about twice as long 

 as the calyx ; stamens fifteen to eighteen, longer than the ova- 

 ries ; carpels numerous, hairy, especially on their keel, obovate, 

 compressed, with the inferior keel very convex, the superior a 

 little depressed towards the base, convex near the style : beak 

 moderate, thick, obliquely ascending, inserted a little above the 

 outer extremity of the long diameter. 



There is a form of this with glabrous carpels. Obs. — R. Go- 

 dronii, Gren., resembles R. radians, but is more slender, flowers 

 only half as large, its carpels fewer, with a more slender keel. 



R. rhipiphyllus , Bast. Stem little branched j submersed leaves 

 with long, setaceous, flaccid segments ; petioles with small stipules 

 or none ; floating leaves nearly truncate at the base, spreading like 

 a fan, with three shallow lobes, which are twice or three times 

 notched ; peduncles slightly longer or shorter than the leaves ; 

 calyx much spreading, with concave sepals ; flowers of moderate 

 size ; petals obovate, narrowed, distant from each other ; recep- 

 tacle hairy ; carpels numerous, clothed with few and not perma- 

 nent hairs, obliquely obovate, hardly mucronate when the stigma 

 has fallen : stigma thick, glandular, yellowish, a little curved. 



R. aguatilis, Dodon. and Linn. Sp. {B. heterophyllu7n, Fries). 

 Stem fistulose, angular ; submersed leaves with short, compressed 

 petioles, their segments flaccid, spreading in the water, collapsing 

 in the air ; floating leaves reniform, lobed, often velvety beneath : 

 base of the petiole dilated into a membranous adhering sheath, 

 which is shortly auriculate and often hairy ; peduncles hardly ex- 

 ceeding the leaves ; buds ovate-globular ; calyx spreading ; recep- 

 tacle spherical, hairy ; petals obovate, much exceeding the calyx ; 

 carpels large, not narrowed at their base, nearly always hispid, 

 with a widened beak which is curved at its summit. 



