( 415 .) 
HELOSCIA'DIUM* *. 
Linnean Class and Order. Penta'ndria f, Dig y'nia. 
Natural Order. Umbellt'fer.e^, Juss. Gen. PI. p. 218. — Sin. 
Gram, of Bot. p. 132. — Lind]. 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. 
FI. llibern. p. 1 13. — Hook. Brit. FI. (4th ed.) p. 408. — Umbellat.e, 
Linn. — Rosales ; sect. A ngelicin„e ; type.ANGELiCACE.E ; subty. 
Angelicide ; Burn. Outl. of Bot. v. ii. pp. 614, 770, 773, & 774. 
Gen. Char. Flowers all uniform, and generally perfect. Calyx 
(see fig. 2.) a 5-toothed margin, often obsolete. Corolla (see fig. 1.) 
of 5, equal, egg-shaped, entire petals, with more or less of an in- 
flexed point. Filaments (see fig. 1.) 5, thread-shaped, spreading, 
longer than the corolla. Anthers roundish. Germen (fig. 2.) in- 
ferior, roundish-egg-shaped, striated. Styles (see figs. 1 & 2.) 2, 
cylindrical, more or less spreading, moderately swelling at the base, 
short, permanent. Stigmas blunt. Fruit smooth, compressed from 
the sides, egg-shaped, or oblong. Carpels with 5, slender, promi- 
nent, equal ridges , of which the two lateral ones form a margin. 
Interstices ( channels ) with one villa each (see fig. 3) . Seed more 
or less convex, flattish in front. Involucrums various. Flowers 
white. 
The calyx of 5 small teeth, or obsolete ; the egg-shaped, entire 
petals, with a straight or inflexed point ; the egg-shaped or oblong, 
compressed, smooth fruit ; and the carpels with 5, slender, pro- 
minent, equal ridges, with one villa in each channel ; will distin- 
guish this from other genera in the same class and order. 
Three species British. 
HELOSCIA'DIUM NODIFLO'RUM. Knot-flowered Marsh- 
wort. Procumbent Water-Parsnep. Water-Skerret. Fool’s Water- 
Cress. 
Spec. Char. Stem rooting, procumbent. Leaves pinnate; 
leaflets egg-shaped, equally serrated. Umbels opposite the leaves, 
sessile or on short peduncles. 
Helosciadium nodiflorum, Koch. Umb. p. 126. — Lindt. Syn. p. 122. — Hook. 
Brit. FI. (4th ed.) p. 112. — Macr. Man. Brit. Bot. p. 98. — Don’s Gen. Syst. of 
Gard. and Bot. v. iii. p. 281. — Bab, FI. Bath. p. 21. ; Print. FI. Sara. p. 42. — Luxf. 
lleig. FI. p. 24. — Cow. Ft. Guide, p. 48. — Leight. FI. of Shropsli. p. 131 . — Slum 
nodiflorum , Linn. Sp. l’l. p. 361. — Engl. Bot. t. 639. — Woodv. Med. Bot. v. iii. 
p. 494. t. 182.— Huds. Ft. Angl. (2nd ed.) p. 119.— Willd. Sp. PI. v. i. pt. II. p. 
1432. — Sm. FI. Brit. v. i. p. 313. ; Engl. FI. v. ii. p. 57. — With. (7th ed.) v. ii. 
p. 379. — Gray’s Nat. Arr. v. ii. p. 505. — Hook. Brit. FI. p. 125. — Lightf. FI. Scot, 
v. i. p. 161. — Sibth. FI. Oxon. p. 96. — Abbot’s FI. Bedf. p. 62. — Thornt. Fan). 
Herb. p. 296, with a figure. — Davies’ Welsh Bot. p. 28. — Part. Midi. FI. v. i. p. 
143. — Relh. FI. Cant. (3rd ed. ) p. 118. — Hook. FI. Scot. p. 90. — Grev. FI. Edin. 
p. 65. — FI. Devon, pp. 50 & 166. — Jolinst. FI. of Beni;. v. i. p. 69. — Hook. Bot. 
Miseell. v. ii. p. 409. — Winch’s FI. of Northumb. and Durh. p. 18. — Walker’s FL 
Fig. 1. A Flower. — Fig. 2. Germen and Pistils. — Fig. 3. Transverse section of 
the Fruit. — All, more or less, magnified. 
* From elos, Or. a marsh ; and skiadion, Gr. an umbel ; in allusion to the 
place of their growth. 
t See folio 48, note t. 
J See folio 235, a. 
