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, leajiets ,- the immersed ones twice or thrice compound, 

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

 as long, each bearing a pair ot" stalked distant tonie/s, oiojlowers, 

 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 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 hracteas. 



6. S. vert'ic'iUatum. Whorled Water-parsnep. 



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

 ments. 



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

 " DeCand. Fr. t'.4.302." Fl. Br. 3 14. Spreng. Sp. Umh. 101. 



Sison verticillatum. Linn. Sp. Pl.363. Willd.v.\.\437. Engl.Bot. 

 V. 6. t. 395. Huds. 120. Lig/iff. 1096. t. 35. Hook. Scot. 90, 



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



D. pratensis. Dalevh. Hist. 7 ^S-f- 



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

 /. 10. 



In salt marshes. 



Plentiful in the western parts of Scotland and Wales. Huds. Light/. 

 Near Lane bridge, Killarney ; and between Bantry Bay and 

 the river of Kenmare, Ireland, il/r. 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 sheathing/oo^s/a^/«, pinnate, with numerous pairs of ses- 

 sile leajiets, 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 reflexed styles, which are tumid at the 



