( 370 .) 
IMPERATO'RIA* *. 
Linnean Class and Order. Penta'ndria f, Digy'nia. 
Natural Order. Umbelli'fer.e %, Juss. Gen. PI. p. 218. — Sm. 
Gram, of Bot. p. 132. — Lind]. Syn. p. 1 1 1 ; 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. Hibern. p. 113. — Hook. Brit. FI. (4th edit.) p. 408. — Umbel- 
late, Linn. — R osales; sect.ANGELiciNds; type,ANGEL!CACE.E ; 
subtype, Angelicide:; Burn. Outl. of Bot. v. ii. pp. 614, 770, 
773, & 774, 
Gev. Char. Flowers (see fig. 1,) all perfect and prolific, the 
outermost only very slightly irregular. Calyx none. Corolla (fig-1.) 
of 5 inversely heart-shaped petals, with a slender incurved point. 
Filaments (see fig. 1.) 5, thread-shaped, spreading, longer than the 
petals. Anthers almost globular. Germen (see fig. 2.) inferior, 
nearly orbicular, compressed, ribbed. Styles (see fig. 2.) 2, short, 
distant, egg-shaped, and very tumid at the base. Stigmas capitate. 
Floral-receptacle ( slylopodium, Hoffm.y none. Fruit (see figs. 3. 
and 4.) orbicular, crowned with the bases of the styles, having a 
hollow at top and at bottom, and a rounded, dilated, closely com- 
pressed margin. Carpels (see figs. 5 & 6.) convex, with 3 pro- 
minent dorsal ribs, and a broad, Hat, even border, as wide at each 
side as the body of the carpel. Interstices (see fig. 6.) with single 
vittcs. Seed flat on its inner face. Involucrum variable ; involu- 
cellum many-leaved. 
Distinguished from other genera, in the same class and order, by 
the obsolete calyx; the inversely heart-shaped, very slightly irre- 
gular petals, with inflexed points ; the solid, unarmed, transversely 
compressed fruit, with a broad thin margin; the carpels with 3 
prominent dorsal ribs, and 2 nearly obsolete marginal ones, con- 
tiguous to, or combined with the margin ; and the interstices with 
single viltcE. Differs from Peucedanum in the calyx being obsolete. 
One species British. 
IMPERATO'RIA OSTRU'TIIIUM. Sparrow Masterwort. 
Great Masterwort. Broad-leaved Hog’s Fennel. Bastard Pillitory 
of Spain. 
Spec. Char. Lower leaves twice ternate ; upper ones less com- 
pound ; leaflets broad, smooth, rough edged, finely and sharply 
serrated, partly cut or lobed, sometimes 3-cleft. Sheaths of leaves 
dilated. 
Engl. Bot. t. 1380. — Woodv. Med. Bot. v. i. p. 102. t. 35. — Linn. Sp. PI. p. 371. — 
Huds. FI Angl. (2nd ed. ) p. 649. — Willd. Sp. PI. v. i. pt. n. p. 1458. — Sm. FI. Brit, 
v. i. p. 327. ; Engl. FI. v. ii. p. 78. — With. (7th edit.) v. ii. p. 391. — Macr. Man. 
Brit. Bot. p. 103. — Don’s Gen. Syst. of Gard. and Bot. v. iii. p. 335, — Lightf. FI. 
Scot. v. i. p. 168. — Thornt. Fam. Herb, p. 298, with a figure. — Hook. FI. Scot. p. 
94. — Grev. FI. Ediu. p. 67. — Winch’s FI. of Northumbl. and Durh. p. 19. — Burn. 
Fig. 1. A separate Flower. — Fig. 2. Germen and Styles, with a partial flower- 
stalk, and a leaf of the involueellum. — Figs. 3 & 4. The Fruit. — Figs. 5 & 6. Trans- 
verse section of the same. — All, except figs. 2 and 3, more or less magnified. 
* So named from its supposed imperial virtues in medicine. Don. 
t See folio 48, note +. $ See folio 235, a. 
