Exacum. | LXXXVII. GENTIANE® (BAKER AND BROWN). 545 
TrisE II. Chironieze.—Leaves opposite. Corolla-lobes contorted, without 
nectaries. Ovary 1-celled, with parietal or much intruded, but not connate, 
placentas. 
Leaves well developed, green. 
Flowers in terminal simple or panicled lax or rarely 
fastigiate cymes ; anthers exserted beyond the 
corolla-sinuses. 
Calyx-lobes 4-5 times as long #s the tube, or tube 
none. 
Corolla large, its lobes 5—9 lin. long : 
Corolla small, its lobes not more than 2 lin. long 
Calyx-lobes shorter than the tube. 
Corolla-tube shorter than the lobes : . 6. SCHINZIELLA. 
Corolla-tube longer than the lobes. 
Corolla-lobes 3-3 lin. long, 3-1 lin. broad ; 
anthers usually only 1 (or in C. Airkii 
. CHIRONIA. 
. ERYTHRA. 
ok 
all) fertile : : : : . 7. CANSCORA. 
Corolla-lobes 4 lin. long and broad ; anthers : 
all fertile. : : 8. SCHULTESIA. 
Flowers solitary in both axils of the leaf-pairs all 
along the stems . : fe : 5 ‘ 
Flowers in dense axillary clusters all along the 
stems or in dense terminal clusters or heads. 
Stamens inserted at the middle of the corolla- 
tube, included . ; $ : : . 10. ENICOSTEMA. 
Stamens inserted at the mouth of the corolla- 
tube, exserted. 
9. NEUROTHECA. 
Flowers 3-merous; sepals very unequal. . 11. PycNosPH@RA. 
Flowers 4-merous; sepals equal . is “12. BAROA: 
Leaves very small or rudimentary, not green; 
stamens included. : c : : - 13: VOYRIA- 
TRIBE Ill. Swertiese.— Leaves opposite. Corolla-lobes contorted, with 1-2 
fringed nectaries near their base. Ovary 1-celled, with parietal placentas. 
The only Tropical African genus. ‘ : . 14, SWERTIA. 
Trine IV. Menyantheve.—Leaves all radical or alternate. Corolla lobes 
induplicate-valvate. Ovary 1-celled, with parietal placentas. 
The only Tropical African genus, aquatics ; . 15. LIMNANTHEMUM. 
1. EXACUM, Linn.; Benth. et Hook. f. Gen. Pl. ii. 803. 
Calyx 4—5-lobed to the middle or nearly to the base. Corolla-tube 
campanulate ; segments 4-5, ovate or oblong, contorted in zestivation. 
Stamens 4-5, exserted from the corolla-tube, inserted below the 
sinuses of the corolla; filaments short; anthers oblong, dehiscing by 
terminal-pores or longitudinal slits. Ovary globose, 2-celled; style 
subulate; stigma capitate; placentas axile ; ovules many in a cell. 
Capsule globose, septicidally 2-valved. Seeds many, minute.— Annual 
or very rarely perennial herbs. Leaves entire. Flowers various in 
colour, arranged in terminal dichotomous cymes. 
Species 20-25, chiefly natives of India, China and the Malay Archipelago, extend- 
ing into Socotra and Madagascar. 
VOL. Iv. 2N 
