( 319 .) 
SI'UM* 
Linnean Class and Order. Penta'ndria f, Digy'nia. 
Nalurul Order. Umuelli'feraj+, Juss. Gen. PI. p. 218. — Sm. 
Gram, of Bot. p. 132. — Lindl. Syn. p. 1 11 ; Introd. to Nat. Syst. 
of Bot. p. 4. — Rich, by Macgilliv. p. 463. — Loud. Hort. Brit. p. 
517. — Don’s Gen. Syst. of Card, and Bot. v. iii. p. 235. — Mack. 
FI. Hibern. p. 113. — Umbellate, Linn. — Rosales; sect. An- 
gelicina:; type, Angelicaceas ; subtype, A ngelichde ; Burn. 
Outl. of Bot. v. ii. pp. 614, 770, 773, & 774. 
Gen. Char. Flowers (figs. 1 & 2.) all uniform, generally per- 
fect. Calyx of 5 small teeth, or obsolete. Corolla (figs. 1 & 2.) 
of 5, inversely heart-shaped petals, with an indexed point. Fila- 
ments (see fig. 2.) 5, thread-shaped, spreading, longer than the 
corolla. Anthers roundish. Germen inferior, roundish egg-shaped, 
striated. Styles (see fig. 6.) 2, cylindrical, more or less spreading, 
moderately swelling at the base, shorter than the petals, permanent. 
Stigmas blunt. Fruit (figs. 5 & 6.) egg-shaped, or globose, com- 
pressed at the sides, or contracted and nearly double, crowned by 
the disk and reflexed styles. Carpels (see fis(. 7.) with 5, rather 
blunt ribs, and many villa in the interstices. Universal Involucrum 
various ; partial of many leaves. 
The 5-toothed calyx; the emarginate petals, with an indexed 
point ; the egg-shaped, or globose fruit, crowned with the depressed 
base of the reflexed styles ; and the carpels with 5 thread-shaped 
ribs, with many vittae in their interstices ; will distinguish this from 
other genera in the same class and order. 
Two species British. 
SI'UM LATIFO'LIUM. Broad-leaved Water-parsnep, Great 
Water-parsnep. 
Spec. Ciiar. Stem upright. Leaves pinnated ; leaflets oblong- 
spear-shaped, equally serrated. Umbels terminal. 
Engl. Bot. t. 204. — Hook. Ft. Lond. t. 1 10. — Jacq. FI. Austr. v. i. p. 42. t. 66. — 
Linn. Sp. PI. p. 361. — Iluds. Ft. Angl. (2nd oil.) p. 118. — Willd. Sp. PI. v. i. pt. It. 
p. 1431. — Sm. FI. Brit. v. i. p. 312. ; Engl. FI. v. ii. p. 56. — With. (7th od. ) v. ii. 
p. 378. — Lindl. Syn. p. 121. — Hook. Brit. FI. p. 125. — Macr. Man. Brit. Bot. p, 
99. — Don’s Gen. Syst. of Gard. and Bot. v. iii. p. 295. — Lightf. FI. Scot. v. ii. 
p. 1095. — Sibth. FI. Oxon. p. 96. — Abbot’s FI. Bedf. p. 62. — Davies’ Welsh Bot. 
p. 28. — Rclh. FI. Cant. (3rd ed. ) p. 118. — Purt. Midi. FI. v. iii. p. 26.— Hook. FI. 
Scot. p. 90. — Grev. FI. Edin. p. 64. — Winch’s FI. of Northumbl. & Durh. p. 18. — 
Walker’s FI. ofOxf. p. 78. — Mack. Catil. of PI. of Ircl. p. 28. ; Fl. Hibern. p. 120. — 
Sium latifolium, foliis variis, Ray’s Syn. p. 211. — Sium majus latifolium, 
Johnson’s Gerardo, p. 256. f. 1. ; also .S', majus anyusti/oUum, ibid. — Drepano- 
phyllum palustre, Gray’s Nat. Arr. v. ii. p. 504. — Coriandrum latifolium, 
Crantz. Austr. p. 219. 
Looai.ities. — In ditches, margins of rivers, and ponds; not uncommon. — 
Oxfordshire ; Common about Oxford. — Berks; Ditches about Badcot Bridge 
near Faringdoiq: Mr. F’ardon. Ditches by ihe Thames above Maidenhead: 
IV. J. YV inch, F.sq. — Beds. Common: Rev. C. Adisot. — Bucks ; Ditches near 
Figs. 1 & 2. A separate Flower.— Fig. 3. A Petal.— Figs. 4, 5, & 0. Fruit.— 
Fig. 7. A transverse section of a Carpel, showing the Vitta:. — Fig. 8. Two leaflets 
of a submersed Leaf. — Figs. 2, 3, 6, & 7, magnified. 
♦ From siu, water, in Celtic ; habitation of most of the species, 
t See folio 18, note +. i See folio 235, a. 
