( 376 .) 
MYRIOPHY'LLUM * *. 
Linnean Class and Order. MoNCECiAf, Polya'ndria. 
Natural Order. Halora'geje, Dr. R. Brown. — Lindl. Syn. p. 
110; Introd. to Nat. Syst. of Bot. p. 57. — Loud. Hort. Brit. p. 514. — 
Don. Gen. Syst. of Gard. and Bot. v. ii. p. 700. — Mack. FI. Hibern. 
p. 112. — Hook. Brit. FI. (4th ed.) p.405. — Hygrobieaj, Rich, by 
Macgilliv. p. 521. — Naiades, Juss. Gen. PI. p. 18. — Sm. Gram, 
of Bot. p. 66. — Querneales ; sect. Hippurin^e; Burn. Outl. of 
Bot. v. ii. pp. 523 & 576. — Inundate, Linn. 
Gen. Char. Flowers monoecious, rarely united. Barren Flowers 
(fig. 2). Calyx (fig. 1.) inferior, 4-parted. Corolla (see fig. 2.) of 
4 inversely egg-shaped, fugitive petals. Filaments (see fig. 2.) 4, 
6, or 8, hair-like, flaccid, longer than the calyx. Anthers oblong, 
vertical. Fertile Flowers (see fig. 4.) below the others. Calyx ad- 
hering to the germen (see fig. 4.), with a 4-lobed limb. Corolla 
none. Styles none. Stigmas (see fig. 4.) 4, downy. Fruit (see 
figs. 5 & 6.) separable into 4 hard, 1-seeded, indehiscent nuts. 
Albumen almost absent. 
The 4-parted calyx ; and the 4-petaled corolla, with 4, 6, or 8 
stamens of the sterile flowers ; and the 4 stigmas ; and 4, 1-seeded, 
indehiscent nuts of the fertile flowers ; will distinguish this from 
other genera in the same class and order. 
Three species British. 
MYRIOPHY'LLUM VERTICILLATUM. Whorted Water- 
Milfoil. 
Spec. Char. Leaves finely cut into hair-like opposite segments. 
Flowers in axillary whorls. Floral-leaves all pinnatifid, much longer 
than the flowers, and hardly distinguishable from the other leaves. 
Engl. Bot. t. 218. — FI. Dan. t. 1046. — Linn. Sp. PI. p. 1410. — Hu<la. FI. Angl. 
(2nd ed.) p. 420. — Willd. Sp. PI. v. iv. pt. i. p. 407. — Sm. FI. Brit. v. iii. p. 1082. ; 
Engl. FI. v. iv. p. 143. — With. (7th ed.) v. ii. p. 511. — Gray’s Nat. Arr. v. ii. p. 557. 
— Lindl. Syn. p. 110. — Hook. Brit. FI. p. 406. — Macr. Man. Brit. Bot. p. 80. — 
Sibth. FI. Oxon. p. 132. — Abbot’s FI. Bedf. p. 209. — Davies’ Welsh Bot. p. 89. — 
Belh. FI. Cant. (3rd ed.) p. 393. — Purt. Mid. FI. v. iii. p. 69. — Rev. G. E. Smith’s 
PI. S. Kent, p. 66. — Winch’s FI. Northurabl. and Durh. p. 61. — Don’s Gen. Syst. 
of Gard. and Bot. v. ii. p. 703. — Walker’s FI. of Oxf. p. 279. — Perry’s PI. Varvic. 
Bel. p. 78. — Bab. FI. Bath. Supp. p. 78. — Irv. Lond. FI. p. 200. — Mack. Catal. PI. 
Irel. p. 82.; FI. Hibern. p. 112. — Pentapterophyllon aquaticum Bosculis ad 
foliorum nodos, Ray’s Syn. p. 316. — Deering’s Cat. Stirp. Nott. p. 163. 
Localities. — In ponds and watery ditches; not common. — Oxfordsh. By 
the bridge on the Botley-road, near the lane going to Medley : Dr. Sibthorp. 
Ditches near Port Meadow: W. B. — Berks; Ditches near Bray; and near 
Eton: B. G. — Bed/ordsh. Common: Rev. C. Abbot. — Bucks; Ponds and 
ditches near Eton: B. G.— Cambridgesh. In a ditch on Cambridge Common ; 
Coldham Common, by the foot-path to Teversham ; Quey : Rev. R. Reman. — 
Cheshire; Stockport Little Moor, in ponds: B. G .— Derhysh. Pond near 
Swarkeston Bridge: Rev. A. Bloxam. — Dorset ; Boggy ditch, near Wareham: 
B. G. — Durham; At Polam: Mr. Backhouse. The limit of its range to the 
Figs. 1 St 3. Calyx. — Fig. 2. A Barren Flower. — Fig. 4. A Fertile Flower. — 
Fig. 5. Fruit. — Fig. 6. A transverse section of the Fruit, which separates into 
4 hard nuts. — All, except fig. 5, a little magnified. 
* From myrios, Gr. a myriad; and phyllon, Gr. a leaf ; in reference to the 
numerous divisions of the leaves. Don. t See folio 83, note +. 
