PENTANDRIA—DIGYNIA. Sium. 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 ojloivers, 

 with 4 or 5 unequal partial hracteas, 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- 

 ceptacle enlarged. Fruit brown, somewhat elliptical, a little 

 compressed. Seeds each with 5 prominent equidistant ribs, with 

 3 slender intermediate ones. 



According to Linnaean 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 hracteas. 



6. S. verticillatum. Whorled Water-parsnep. 



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

 ments. 



S. verticillatum. Lamarck Fr. v. 3. 460. Roth. Germ. v. 2. 336. 



''DeCand.Fr.v. 4.202." Fl. Br. 314. Spreng. Sp. Umb. \0\. 

 Sison verticillatum. Linn. Sp. Pl.363. fVilld. v. I. 1437. Engl. Bot. 



V. 6. ^.395. Huds. 120. Lightf. 1096. ^.35. Hook. Scot. 90. 

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

 D. pratensis. Dalech. Hist. 718./. 

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



/.lO. 



In salt marshes. 



Plentiful in the western parts of Scotland andWales. Huds. Lightf. 

 Near Lane bridge, Killarney -, and between Bantry Bay and 

 the river of Kenmare, Ireland, 3Ir. J. T. Mackay. 



Perennial. July, August. 



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

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

 divided, or corymbose, at the toj). Leaves chiefly radical, with 

 short sheathing /bo/s^r//A".9, 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, (iencral Brartras 

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

 rous, /7.co])ious, white, with j)urj)lish anthers. Cal. very small, 

 acute. Pet. inversely heart-shaped, partly pointed, iV//// ovate, 

 crowned with the short rcflexcd styles, which arc tumid at the 



