( 19 .) 
yETHU'SA* *. 
Linnean Class and Order. Penta'ndria f, Digy'nia. 
Natural Order. UMBELLi'FKrtA?, Juss. Gen. PI. p. 218. — Sm. 
Gram, of But.. p. 132 ; Eng. FI. v. ii. p. 32. — Lind. Syn. p. 11 1 ; 
Introd. to Nat. Syst. of Bot. p. 4. — Hook. Brit. FI. pp. 1 12 — 1 14. — 
Rich, by Macgiiliv. p. 463. — Loud. Hort. Brit. p. 517. 
Gen. Char. Flowers all perfect; the marginal ones a little 
irregular. Calyx superior, very minute, often scarcely discernible. 
Corolla of 5 petals, which are inversely heart-shaped, with a sharp 
indexed point ; the outermost rather the largest. Filaments 5 
(tig. 2.), thread-shaped, horizontal, shorter than the corolla. Anthers 
roundish. Gerrnen (fig. 3.) inferior, roundish, egg-shaped, deeply 
furrowed, rather pointed. Styles 2, short, spreading, tumid and 
egg-shaped at the base ; at length reflexed, scarcely elongated. 
Stigmas blunt. Fruit roundish-egg-shaped. Carpels [seeds, Linn.) 
with 5 elevated, thick, sharply-keeled ridges, the lateral ones mar- 
ginal, a little broader than the other, and bordered by a somewhat 
winged keel. Channels ( interstices ) with 1 vitta (see p. 13,). 
Seed half globose. General Involucrum none. Partial Involu- 
crum (fig. 1.) of 3 unilateral pendulous leaves. 
The roundish egg-shaped fruit, with 10 elevated, thick, sharply 
keeled ridges ; the inversely heart-shaped, deeply lobed petals 
with a sharp inflexed point; the short styles, tumid, and egg- 
shaped at the base ; and the partial involucrum of 3 unilateral 
drooping leaves (see fig. 1.) ; will distinguish this from other genera 
in the same class and order. 
One species British. 
jETHU'SA CYNA'PIUM. Common Fool’s Parsley. Lesser 
Hemlock. 
Spec. Char. Leaves uniform, leaflets wedge-shaped, decurrent 
(running down the leaf-stalk), segments spear-shaped. 
Eng. Bot. t. 1192. — Curt. FI. Lond. t. 18. — Linn. Sp. PI. p. 367. — Huds. FI. 
Ang. (2nd ed.) p. 123 — Sm. FI. Brit. v. i. p 323. — Eng. FI. v. ii. p. 64. — 
With. (7th ed.) v. ii. p. 386. — Lindl. Syn. p. 1 19. — Hook. Brit. FI. p. 122. — 
Ligluf. FI. Scot. v. i. p. 165. — Sibth. PI. Oxon. p. 99. — Abbot’s FI. Bedf. p. 65. — 
Port. Midi. FI. v. i. p. 155. — lfelh. FI. Cant. (3rd ed.) p. 122. — Hook. FI. Scot, 
p. 92. — Grev. FI. Ldin. p.66. — FI. Devon, pp. 52 dc 167. — Johnston’s FI. of 
Berwick, v. i. p. 69. — Curt. Brit. P.ntom. v. i. t. II. — Walk. FI. of Oxf. p. 79. — 
Mack. Catal of PI. of 1 1 el. p. 29. — Bab. FI. Bath, p 20. — JEthusa tenuifolia, 
Gray’s Nat. Arr. y. ii. p. 513. — Cicutdria tenuifolia, Bay’s Syn. p. 215.— John- 
son’s Gerarde, p. 1063. 
Locali iies.— A common weed in gardens and cultivated fields. 
Fig. 1. Partial Involucrum. — Fig. 2. Corolla. — Fig. 3. Germen, Calyx, and 
Styles. — Fig. 4. Fruit. — F’ig. 5. Transverse section of ditto.— I ig. 6. Back of a 
Carpellum. — Fig. 7. Front of ditto. — Figs. 2, 3, 5, 6, & 7, more or less magnified. 
* From ailho, Gr. to burn, on account of its acrid quality. Dr. Hooker, 
in Br. FI. 
f The 5tbclass in the Linnean Artificial System ; it comprehends ail those 
plants which have perfect flowers with 5 distiuct stamens in each. 
