( 400 .) 
E'XACUM* * 
Linnean Class and Order. Tetra'ndria f, Monogy'nia. 
Natural Order. Gentia'neai:, Dr. R. Brown . — Lindl. Syn. 
p. 177. ; Introd. to Nat. Syst. of Bot. p. 215. — Rich, by Macgilliv. 
p. 444. — Loud. Horr. Brit. p. 526. — Don’s Gen. Syst. of Gard. and 
Bot. v. iv. p. 173. — Mack. FI. Hibern. p. 185. — Hook. Brit. FI. 
(4th ed.) p. 413. — Gentia'nte, Juss. Gen. PI. p. 141. — Sm.Gram. 
of Bot. p. 106. — Syringales; subord. Primulos.e ; sect. Gen- 
tianinve ; type, Gentianacea: ; Burn. Outl. of Bot. v. ii. p. 900, 
958, & 1008. — Rota'ce^e, Linn. 
Gen. Char. Calyx (fig. 1.) inferior, of 1 sepal ; divided about 
half way down into 4 equal, pointed segments, permanent. Corolla 
(see figs. 2 & 3.) of 1 petal, with a swelling tube the length of the 
calyx ; and a 4-parted, spreading limb ; segments equal, imbricate 
in the bud. Filaments (see fig. 3.) 4, from the tube of the corolla, 
between the segments of the limb, and much shorter, thread-shaped, 
nearly equal, upright. Anthers roundish-oblong, of 2 cells. Germen 
(see fig. 4.) oval, superior. Style (see fig. 4.) terminal, thread- 
shaped, a little inclining, as long as the limb. Stigma capitate, 
undivided. Capsule (figs. 6 & 7.) filling the tube of the corolla, 
which gradually enlarges with it, elliptical, compressed, imperfectly 
2-celled. Seeds numerous, small, rough, attached to a fixed, or 
finally separated, double receptacle f placenta J. 
The 4-cleft calyx ; the monopetalous, inferior, salver-shaped, 4-cleft corolla, 
with a swelling tube ; the roundish-oblong anthers of 2 cells, opening longitu- 
dinally ; the entire stigma ; and the imperfectly 2-celled, many-seeded capsule ; 
will distinguish this from other genera in the same class and order. 
One species British. 
E'XACUM FILIFO'RME. Filiform Exacum. Least Gentia- 
nella. Marsh Centory. 
Spec. Char. Stem thread-shaped, forked. Leaves chiefly ra- 
dical, spear-shaped, or spatulate, single-nerved, sessile. Flowers 
on long pedicels. 
Engl. Rot. t. 235. — Hook. FI. Lond. t. 8G. — Sm. FI. Brit. v. i. p. 182.; Engl. 
FI. v. i. p. 212. — Willd. Sp. PI. v. i. pt. I. p. 638. — With. (7th ed.) v. ii. p. 229. — 
Ait. Hort. Kew. (2nded.) v. i. p. 250. — Lindl. Syn. p. 177. — Ilook. Brit. FI. p. 
66. — Maer. Man. Brit. Bot. p. 157. — FI. Devon, p. 28. — Irv. Lond. FI. p. 225. — 
Luxf. lteig. FI. p. 13. — Mack. Catal. PI. of Irel. p. 18. ; FI. Flibern. p. 185. — 
Microcule filifbrme, Link. Don’s Gen. Syst. of Gard. and Bot. v. iv. p. 213. — 
Franquevillia minima, Gray’s Nat. Arr. p. 338. — Gentidna filiformis, Linn. 
Sp. PI. p. 335. — Iluds. FI. Angl. (2nd ed.) p. 103. — FI. Dan. t. 324. — With. 1st ed. 
v. i. p. 142.; 2nd ed. v. i. p. 263. — Cicendia filiformis, Reich. — Bab. Prim. FL 
Sam. p. 61. — Centaurium palustre luteum minimum nostras, Ray’s Syn. 
p. 286. — Y T ai!l. Paris, p. 32. t. 6. f. 3. 
Localities. — O n sandy or turfy bogs .—Cornwall ; Marsh between Penzance 
and Marazion ; and by the cross road to St. Ives; Mr. H. C. Watson, in N.B. G. 
Sandbanks between St. ISlazey Bridge and the Par Sand: Mr Stackhouse. In 
a ditch near the road leading to Bodmin, four miles from St. Michael’s ; Gorse 
Moor and Roche; Rev. J. P. Jones, in Bot. Tour, pp. 36 & 37. Gorse Moor, 
close by the side of the Truro and Bodmin road; August 14, 1840 ; Mr. W. 
Willis.-- Devon ; Here and there in the county: Hudson. More frequent in 
Fig. 1. Calyx. — Figs. 2 & 3. Corolla. — Fig. 4. Germen, Style, and Stigma. — 
Fig. 5. Capsule. — Fig. 6. Capsule with valves separated. — Fig. 7. Transverse sec- 
tion of same. 
* From ex, Or. out ; and ago, Gr. to drive ; from its supposed property of 
ejecting poison from the stomach. f See folio 46, note +. 
