212 GENTIANEJE. XLIII. 
mous ; leaves sessile, ovate, 3-nerved ; flowers quinquefid ; seg- 
ments of calyx acuminated, with simple keels on the back, about 
equal to the segments of corolla in length. (2. G. Native of 
Van Diemen’s Land, and of New South Wales. E’xacum 
ovàtum, Labill. nov. holl. 1. p. 38. t. 52. Corolla red.? 
Ovate-leaved Sebzea. Fl. Aug. Clt. 1820. Pl. 1 foot. 
8 S. ampicua (Cham. in Linnza, 6. p. 346.) stem fastigiately 
cymose, dichotomous ; leaves broad-ovate, rather fleshy ; flowers 
quadrifid ; stamens exserted ; calyx obconical, with diaphanous, 
obtuse, rounded, toothed segments. (2. G. Native of the 
Cape of Good Hope. 
Var. a, grácilis (Cham. l. c.) outer branches of cyme evolute. 
Var. B, crássa (Cham. |. c.) outer branches of cyme con- 
tracted ; flowers glomerate. 
Ambiguous Sebea. Pl. 3 foot. 
9 S. pusitta (Ecklon, mss. Cham. in Linnea, 6. p. 346.) 
flowers quinquefid; stamens inclosed; calyx cylindrical, with 
narrow-lanceolate, keeled, acute segments, which are shorter 
than the tube of the corolla. (2. G. Native of the Cape of 
Good Hope. This species comes nearest to S. ovdta; but dif- 
fers from it in the tube of the corolla, being longer in the in- 
closed stamens, and whole habit. 
Small Sebea. Pl. small. 
Cult. These are elegant plants while in blossom. They 
should be treated like other tender annuals, by being reared on 
a hot bed, and afterwards planted out into a warm, sheltered 
border, about the end of May. 
XLIV. E'XACUM (from ez, out; and ago, to drive; expels 
poison.) Spreng. gen. 1. p. 8.—E'xacum species, Lin. gen. 141. 
Juss. gen. 142.— Centaürium, Plukn. mant. t. 343. f. 3. 
Lin. syst. — Tetrándria, Monoginia. Calyx campanulate, 
4-cleft; segments winged on the back. Corolla salver-shaped, 
or sub-rotate, with a globose or ventricose tube, and a 4-cleft 
limb. Stamens 4, declinate; filaments terete; anthers long, 
somewhat tetragonal, emarginate at the base, erect, dehiscing by 
2 pores at the apex. Style filiform, declinate, flexuous ; stigma 
undivided, clavate, furnished with minutely papillose furrows on 
all sides. Capsule globose, crustaceous, 2-celled, with a septici- 
dal dehiscence; placentas 2, adnate to a double dissepiment, 
thick. Seeds very minute, scrobiculate.—Erect, branched, an- 
nual herbs. Leaves opposite, decussate, sessile, 3-5-nerved. 
Flowers terminal and axillary. 
1 E. se’sstte (Lin. spec. 163.) stem erect, tetragonal, 
simple, dichotomous at top; flowers solitary, from the forks 
of the stem, and tops of the branches; leaves sessile, ovate- 
cordate, obtuse, fleshy; capsule drooping. ©. S. Native of 
the East Indies. Flowers larger than the leaves, 
Sessile-flowered Exacum. PI. 4 foot.? 
2 E. puncra‘tum (Lin. syst. 155. suppl. 124.) leaves nearly 
sessile, oblong, 3-nerved, dotted like Hypéricum; stamens ex- 
serted. ©. S. Native of the East Indies. Corolla bluish. 
Stamens yellow. 
Dotted-leaved Exacum. PI. 4 to 1 foot. 
3 E. mYícoron (Roxb. fl. ind. 1. p. 413.) erect; stem and 
branches tetragonal: angles a little winged; leaves sessile, 
ovate, 5-nerved ; flowers axillary, solitary, on short pedicels ; 
anthers erect. (9. S. Native of Cuttack, in the East Indies. 
Root almost simple. Leaves variable in size ; floral ones small 
and narrow.  Corolias large, white, having the segments tipped 
with blue. 
Two-coloured-flowered Exacum. PI. 1 to 2 feet. 
4 E. reraconum (Roxb. l.c. Wall. pl. rar. asiat. 3. p. 47. t. 
276.) stem simple, erect, tetragonal; leaves sessile, ovate-lan- 
ceolate, 5-nerved ; flowers numerous, terminal; stamens and 
Sepza. XLIV. Exacum. 
style declinate. ©. S. Native of Bengal, where it is called 
Koochuri; Silhet, Nipaul, Kamaon, &e. E. Chulésium, Ham. 
herb. Leaves 2-4 inches long. Flowers large, of a most beau- 
tiful blue colour. Calycine segments dagger-shaped. Segments 
of corolla acute. Anthers linear. This is a most elegant, robust 
lant. 
> Tetragonal-stemmed Exacum. Fl. July, Sept. 
Pl. 3 to 4 feet. 
5 E. styzdsum (Wall. cat. no. 4355.) glabrous; stem tetra- 
gonal; leaves ovate-lanceolate, acute, 3-nerved ; peduncles 
axillary and terminal, corymbose; style longer than the sta- 
mens; segments of corolla obtuse. ©. S. Native of the East 
Indies, about Prome. 
Long-styled Exacum. Pl. 2 to 3 feet. 
6 E. re‘res (Wall. in Roxb. fl. ind. 1. p. 414.) stem and 
branches terete; leaves lanceolate, acuminated, tapering at the 
base, nearly sessile, 3-nerved ; peduncles opposite, 3-flowered, 
forming a terminal corymb ; segments of corolla lanceolate, acu- 
Clt. 1820. 
minated. ©.S. Native of Silhet, and Lower Nipaul. Leaves 
3-4 inches long, and 4 an inch broad in the middle. Flowers 
dark blue, large. Habit of the preceding. 
Terete-stemmed Exacum. PI. 2 feet. 
7 E. ZxvrA'wicuw (Roxb. fl. ind. 1. p. 414.) erect; stem 
and branches tetragonal: angles slightly winged : leaves nearly 
sessile, ovate-lanceolate, acuminated, 3-nerved ; racemes termi- 
nal and axillary, forming an expanded, terminal, corymb-formed 
panicle; flowers pentamerous ; calyx with 5 broad, membranous 
wings, with subulate points. ©. H. Native of Ceylon, and 
the Neelgherries. Chirónia trinérva, Lin. fl. zeyl. p. 90. Willd. 
spec. 1. p. 1065.—Burm. zeyl. p. 145. t. 67. Leaves 1-3 
inches long. Peduncles and pedicels tetragonal. Segments of 
calyx furnished with a broad, membranous wing on the back of 
each. Tube of corolla gibbous. Limb of corolla of 5 obovate, 
mucronate, beautiful, violet-coloured divisions. Anthers linear, 
straight, and hard, with 2 pores at the apex, and also opening 
on the sides. 
Ceylon Exacum. Pl. 1 to 2 feet. 
8 E. cranpiriorum (Wall. cat. no. 4358.) stem tetragonal; 
leaves ovate-lanceolate to lanceolate, acute, 3-5-nerved ; pedun- 
cles axillary and terminal, trichotomous, or 3-flowered, corym- 
bose. ©. S. Native of the East Indies, at Courtallum. 
Flowers large ; segments of corolla ovate-oblong, acute. 
Great-flowered Exacum. PI. 1 to 2 feet. 
9 E. rrpuxcurA' rUM (Lin. spec. 163. Vahl, symb. 1. p. 15.) 
erect ; stem [with 1-2 pairs of opposite branches, then di- 
chotomous, slightly tetragonal; leaves nearly sessile, oblong- 
lanceolate, obtuse, -nerved ; segments of calyx membranously 
winged on the back ; stamens exserted ; style declinate. ©. S. 
Native of Ceylon. E. carinàtum, Roxb. fl. ind. 1. p. 415. Se- 
bae'a carinàta, Spreng. syst. 1. p. 426. Root branched. Flowers 
terminal, numerous, pretty large, yellow, collected in dichoto- 
mous corymbs, with a single, long, pedicellate flower in each 
fork. Filaments inserted on a membranous rim, round the in- 
side of the mouth of the tube.  Anthers erect, opening at the 
sides, yellow. Perhaps a species of Seba. 
Peduncled Exacum. PI. 4 foot. 
10 E. prera’ntuum (Wall. cat. no. 4360.) stem and branches 
tetragonal; leaves elliptic-oblong, tapering to both ends, 3-5- 
nerved ; flowers pedicellate, dichotomously cymose: with a 
flower in each fork; alternate wings of calyx the largest. ©. 
H. Native of Tavoy. 
Wing-flowered Exacum. PI. 1 foot. 
11 E. Hawirróxrt; stem 4-winged; leaves elliptic-oblong, 
acute, 5-nerved ; flowers terminal, corymbose; segments. of 
calyx ovate, acuminated, each furnished with a membranous 
wing on the back. ©.G. Native of Nipaul, where it is called 
