£xacum.] Lxxxvii. gentiane.*: (baker and brown). 545 



Teibk II. Chironieae. — Learps- o/)po.si(e. Corul la-lobes contorted, tcifhvuf 

 nectaries. Orarij l-cclle/l, ivitk parietal or much intruded, tmt not connate^ 

 placentas. 



Leaves we'il devrloiunl, j;reen. 



Flowers in termitiHl simple or pauiclecllax or rarelv 

 fastij^iate eyiiM's ; anthers exserted beyond the 

 corolhi-siiuist'-. 

 Calyx-lobt's 4-5 times aslong-i'S the tube, or tube 

 none. 

 Corolhi lar^as its lobes 5-9 lin. lonp; . . 4. CuiKONiA. 



Corolla small, its lobes not more than 2 lin. lon^ 5. EuYTHiii4:A. 

 Calyx-lobes shorter than the ti.be. 



Corolla-txibe shorter than the lobes . . G. Schinziella. 



Corolla-tube Ioniser tban the lol)es. 



Corolla-lobes §-3 lin. lonjr, i-1 lin. broad; 

 anthers usually oidy 1 (or in C. Kirkii 



all) fertile 7. Canscora. 



Corolla-lobes 4 lin. long and broad ; anthers 



all fertile ...... 8. SciiULTESiA. 



Flowers solitary in both axils of the leaf-pairs all 



alouiT the stems ...... 9. NEUiioxuDCA. 



Flowers in dense axillary clusters all along the 

 stems or in dense teinninal clusters or heads. 

 Stamens inserted at the middle of the corolla- 

 tube, included 10. Enicostema. 



Stamens inserted at the mouth o:^ the corolla- 

 tube, exserted. 

 Flowers 8-inerous; sepals very unequal . . 11. PYCXOsniCEKA. 



Flowers 4-mer(ms ; sei^als equal , . . 12. Fakoa. 



Leaves vei*y small or rudimennary, not gi'een ; 



stamens included . . . . . .13. Voykia. 



Tribe III. S^irertleae. — Leaves opposite. Corolla-lobes contorted, icilh l-ii 

 fringed nectaries near their base. Ovary 1-celled, tvith parietal placentas. 

 The only Tropical African genus 14. Swertia. 



Tribe IV. HXenyantbeae. — Leaves all radical or alternate. Corolla lobes 

 induplicate-ralvate. Ovari/ 1-celled, ivith parietal placentas. 



The only Tropical African genus, aquatics . . 15. Limxanthemum. 



1. EXACUM, Linn.; Benth. et Hook. f. Gen. PI. ii. S();J. 



Calyx 4-r)-lobed to the middle or nearly to the base. Corolhi-tubt- 

 campanula te ; segments 4-5, ovate or oblong, contorted in aestivation. 

 Stamens 4-5, exserted from the corolla-tube, inserted below tlu- 

 sinuses of the corolla ; filaments short ; anthers oblong, dehiscing by 

 terminal-pores or longitudinal slits. Ovary globose, 2-celled ; styh- 

 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 ArchiiH.>lago, extend- 

 ing into Socotra and Mad.-gascar. 



