( 407 .) . 
SI'SON* * 
Linnean Class and Order. Penta'ndria f, Digy'nia. 
Natural Order. Umbelli'ferasJ, Juss. Gen. PI. p. 218. — Sm. 
Gram, of Bot. p. 132.— Lindl. Syn. p. Ill ; Introd. to Nat. .Syst. 
of Bot. p. 4. — Rich, by Macgilliv. p. 463. — Loud. Hort. Brit. p. 
517. — Don’s Gen. Syst. of Gard. and Bot. v. iii. p. 235. — Mack. 
F!. Hibern. p. 1 13.— Hook. Brit. FI. (4th ed.) p. 408.— Umbellate, 
Linn. — Rosales ; sect. Angelicina: ; type, Angelicaca: ; subty. 
Angelicid e ; Burn. Outl. of Bot. v. ii. pp. 614, 770, 773, & 774. 
Gen. Char. Flowers (see fig. 1.) all uniform, perfect, and 
regular. Calyx an obsolete margin. Corolla (fig. 1.) of 5, round- 
ish, curved, deeply emarginate, indexed petals. Filaments (see 
fig. 1.) 5, thread-shaped, spreading, about as long as the corolla. 
Anthers roundish. Styles (see fig. 1.) very short and thick, each 
with a large, tumid, sometimes depressed base, permanent. Fruit 
(see fig. 2.) egg-shaped, compressed at the sides. Carpels (see fig. 3.) 
with 5, equal, filiform ridges, of which the 2 lateral ones form a 
margin. Channels with 1 short, club-shaped vitta in each. Seed 
very convex, flattish in front. Carpophore (central column to 
which the carpels are attached) 2-parted. Universal and partial 
lnvolucrum of few leaves. Flowers white, or cream-coloured. 
The obsolete calyx ; the roundish, curved, deeply notched, in- 
flexed petals ; the egg-shaped, compressed fruit ; and the carpels 
with 5 filiform, equal ridges, with a single, short, club-shaped vitta 
in each channel ; will distinguish this from other genera in the 
same class and order. 
One species British. 
SI'SON AMO'MUM. Ginger-seeded Stone-parsley. Hedge 
Honewort. Bastard Stone-parsley. 
Spec. Char. Stem upright, round, panicled, very much branch- 
ed. Leaves pinnate ; leaflets of the lower ones egg-shaped, lobed, 
deeply cut, and serrated ; of the upper ones strap-spear-shaped. 
Fruit roundish egg-shaped. 
Engl. Bot. t. 954. — Jacq. Hort. Vind. v. iii. t. 17. — Linn. Sp. PI. p. 362. — Huds. 
El. Angl. (2nded.) p. 119. — Willd. Sp. PI. v. i. pt. n. p. 1436. — Sm. FI. Brit. v. i. 
p. 315. ; Eng. FI. v. ii. p. 60. — With. (7th ed.) v. ii. p 380. — Lind. Syn. p. 122. — 
Hook. Brit. FI. p. 128. — Don's Gen. Syst. of Gard. and Bot. v. iii. p. 286. — Macr. 
Man. Brit. Bot. p. 98. — Sibth. FI. Oxon. p. 97. — Abbot’s FI. Bedf. p. 63. — Purt. 
Midi. FI. v. i. p. 151.— Relh. FI. Cant. (3rded.)p, 119.— FI. Devon, pp. 51 & 167.— 
Wineh’s FI. of Northumb. and Durham, p. 18. — Walker’s FI. of Oxf. p. 79. — Bab. 
FI. Bath. p. 21.; Prim. FI. Sam. p. 42. — Trv. Lond. FI. p. 195. — Luxf. Reig. FI. 
p. 24. — Cow. FI. Guide, p. 48. — Leiglit. FI. of Shropshire, p. 131. — Sison . five 
officinarum Amomum, Bauh. Hist. v. iii. pt. ii. lib. 27. p. 107. — Sison quod 
Amontnm officinis nostras, Bauh. Pin. p. 154. — Sium aromaticum Sison Off. 
Ray’s Syn. p. 211. — Sium aromaticum, Lamarck’s Diet. v. i. p. 405. — Gray’s 
Fig. 1. A Flower. — Fig. 2. A Fruit. — Fig. 3. Transverse section of ditto. — 
All magnified. 
* From sizun, Celtic, a running stream ; some of the plants formerly placed 
in this genus delighting in such situations. Sir W. J. Hooker. Or, from seio, 
seiso, Gr. to shake, as agitated by waters. Dr. Withering. 
f See folio 48, note t. 4 See folio 235, a. 
