PENTANDRIA— DIGYNIA. Slum. 59 



Perennial ? May. 



Root creeping-. Stems procumbent or floating, branched, round, 

 leafy, throwing out fibrous radicles. Leaves on dilated clasping 

 footstalks, alternate, oblong ; those above water simply pinnate, 

 with 5 or 7 wedge-shaped, 3-cleft or pinnatifid, somewhat suc- 

 culent, leaflets; the immersed ones twice or thrice compound, 

 and capillary. Flower-stalks opposite to the leaves^ and nearly 

 as_ long, each bearing a pair of stalked distant umbels, of o flowers, 

 with 4 or 5 unequal partial bracteas, but no general ones. Fl. 

 white, all perfect and prolific. Cal. hardly discernible. Pet. 

 ovate, slightly incurved. Styles very short, spreading, perma- 

 nent, but not elongated after the flowering, nor is the floral re- 

 cejjtacle enlarged. Fruit brown, somewhat elliptical, a little 

 compressed. Seeds each with 5 prominent equidistant ribs, with 

 3 slender intermediate ones. 



According to Linnsean principles, founded on the inflorescence, this 

 plant should belong to Hydrocotyle ; but its habit and seeds are 

 surely those of a Sium. With Sison it has no connexion. Spren- 

 gel says it would be a Sium, had it general bracteas. 



6. S. vertic'illatum. Whorled Water-parsnep. 



Leaflets in numerous, linear, almost capillary, whorled seg- 

 ments. 



S. verticillatum. Lamarck Ft. v. Z. A&^. Both. Germ. v. 2. 336. 



"DeCand.Fr.v. 4.302." FLBr.3l4. Spreng. Sp. Umb. 101. 

 Sison verticillatum. Linn. Sp. Pl.363. IVilld. v. 1. 1437. Engl. Bat. 



V. 6. t.39b. Huds. 120. Light/. 1096. t.35. Hook. Scot. 90. 

 Daucus pratensis, millefolii palustris folio. Bauh. Pin. 150. 

 D. pratensis. Dalech. Hist. 718. f. 



CEnanthe millefolii palustris folio. Moris, v. 3. 289. sect. 9. t. 7. 

 f. 10. 



In salt marshes. 



Plentiful in the western parts of Scotland and Wales. Huds, Lightf. 

 Near Lane bridge, Killarney ; and between Bantry Bay and 

 the river of Kenmare, Ireland. Mr. J. T. Mackay. 



Perennial. July, August. 



Roots fleshy, spindle-shaped, aggregate. Stem solitary, 12 or 18 

 inches high, erect, round, striated, almost naked ; slightly sub- 

 divided, or corymbose, at the top. Leaves chiefly radical, with 

 short sheathhig footstalks, pinnate, with numerous pairs of ses- 

 sile leaflets, each deeply cut into many narrow linear segments, 

 which spread so as to form a series of whorls. Umbels few, 

 terminal, of many general and partial rays. General Bracteas 

 about six, short, ovate ; partial lanceolate, rather more nume- 

 rous. Fl. copious, white, with purplish anthers. Cal. very small, 

 acute. Pet. inversely heart-shaped, partly pointed. Fruit ovate, 

 crowned with the short rcflexed styles, wliich are tumid at the 



