EXACUM.] GENTIANACE&. 71 



clustered, or solitary, rarely braoteafce. Calyx inferior, persistent, 

 4-7-lobed or -pmrtite ; lobes usually imbricate in bad. Corolla-tube 

 oatnpanulate, funnel-shap3l or oyliniric ; lobes 4-7, twisted to the 

 right or (in Limnan^kemum) induplicate-valvate. Sta>nens 4-7, 

 on the throat or tune of o^ro.la, alt^rnite with its lobes, unequal or 

 more or less suppressed in anscora and ELoppea ; filaments linear 

 or sometimes dilated below; amhers opening longitudinally, rarely by 

 apical pores. Dish annular >r of 5 glands or aone. Ovary of 2 

 carpels, i-2-oelled ; style sunjle, stign* end re or 2-lob3d ; ovules 

 usually numerous. Fruit usaally a caps ile, membranous, dehiscing 

 septicidally by tw valves, rarely deshy. Seeds inaay, small, some- 

 times winged, aloumin ns. -Species o-o'OO, chiedy in temperate or in 

 mountainoas regions of both hemispheres. 



Terrestrial herbs, leaves opposite, cor. -lobes 

 contorted in bad. 



Ovary 2-celled '} . . .1. BxAOUM. 



Ovary 1-celled. 



Cor.-lobes eglandular at the base. 

 Cor. regular. 

 Style linear. 

 Flowers white, in sesaile axillary 



clusters 2. ENICOSTEMA. 



Flowers pink or white, in dichoto- 



mous cymea 3. EBTTHB^JA. 



Style short or none, flowers usually 



blue 4. GENTIANA. 



Cor. irregular. 



Flowers yellow, stigma subentire . 5. HOP PEA.. 

 Flowers pink or white, stigma deeply 



2-lobed 6. CANSCORA. 



Cor. with one or two glandular nectaries at 



the base of each lobe . . . .7. SWEBTIA. 

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

 duplicate. val vat e in bud . . . .8. LIMNANTHEMUM. 



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



Annual herbs with quadrangular and usually branching atems. 

 Leaves opposite, entire. Flowers showy, in terminal an 1 axillary 

 usually diohotomous cymes. Calyx deeply 4-5-lobed ; lobes keeled, 

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



