EXACUM.] 



GENTIANACEJE. 



71 



olusteroi, or solitary, rarely bnnteate. Galyv inferior, persistent, 

 4-7-lobed or -partite ; lobes usually imbricate in bud. Corolla-tube 

 oampanulate, funnel-suap.) I or cylinlric; lobe* 4-7, twisted to the 

 ri^.it or (in Limn tn'hemum) in duplicate- valvate. Stanens 4-7, 

 on the throat or tuoe i»f Oi>roda, altera ite with its lobes, unequal or 

 more or le-n suppressed in anscora anl Soppei ; filaments linear 

 or som 'tunes dil ited below; anthers op'ning longitudinally, rarely by 

 apical pores. Disk annular or of 5 glands or aone. Ovxry of 2 

 carpels, i-2-celled ; style sunole, stign* en'.iie or 2-lobjd ; ovales 

 usually numerous. Fruit us daily a cap3 ile, membranous, dehiscing 

 septicidally by tw > valves, rarely tieshy. Seeds many, small, some- 

 times winged, alouiniums. -Species 5-dOO, chiedy in temperate or in 

 mountainous regions of both hemispheres. 



Terrestrial herbs, leaves opposite, cor.-lobea 

 contorted in bud. 



Ovary 2-celled • •.••• 

 Ovary 1-celled. 



Cor.-lobes eglandular at the base. 

 Cor. regular. 

 Style linear. 



Flowers white, in sessile axillary 

 clusters ..... 



Flowers pink or white, in dichoto- 

 mous cymes ..... 



Style short or none, flowers usually 

 blue ...... 



Cor. irregular. 

 Flowers yellow, stigma subentire 



Flowers pink or white, stigma deeply 

 2-lobed 



Cor. with one or two glandular nectaries at 

 the base of each lobe . . 



Aquatic herbs, leaves alternate, cor.-lobes in- 

 duplicato-valvate in bud .... 



1. ExACUiT. 



2. Enicostema. 



3. Erythr^ia. 



4. Gentian a. 



5. Hop pea. 



6. Canscora. 



7. SWERTIA. 



8. LlMNANTHEMUM. 



1. EXACUM, Linn. ; Fl. Brit. Ind. iv, 95. 



Annual herbs with quadrangular and usually branching stems. 



Leaves opposite, entire. Flowers showy, in terminal an I axillary 



usu illy di.-hotomous cymes. Culyr deeply 4-5-lobed ; lobes keeled, 



winged or flat. Corolla rotate, blue, purple or white, usually persis- 



