199- GENTIANACEAE 43I 



Corolla without nectaries, but sometimes with scales at the insertion of the 

 stamens. Pollen-grains smooth or dotted 13 



13. Corolla with distinctly unequal segments and imbricate, more rarely 



contorted aestivation, white or red. Stamens 4, inserted at different 

 heights on the corolla-tube, usually one only perfect. Pollen-grains 

 smooth. Stigma 2-lobed. — Species 3. Tropics. Used medicinally. 



Canscora Lam. 

 Corolla with equal or subequal segments and contorted aestivation. . 14 



14. Fertile stamen i, staminodes 3 ; all inserted in the sinuses between the 



corolla-lobes. Pollen-grains smooth. Corolla yellow, with a short 

 tube. Stigma 2-lobed. Stem 4- angled or winged. Leave? v^ry small, 

 decurrent along the stem. Flowers in dense cymes. - Species i. 

 Southern West Africa (Angola). (Under Canscora Lam.) 



Schinziella Gilg 

 Fertile stamens 3 — 8, rarely more 15 



15. Flowers 6 — 8-merous, rarely polymerous. Corolla yellow, with a short 



tube. Pollen-grains smooth. Stigma 2 -parted with deeply notched 

 branches. Flowers in lax cymes. — Species 2. North-west Africa. 



Used as ornamental or medicinal plants Chlora L. 



Flowers 3 — 5-merous. Stigma entire or 2-parted with entire branches. 16 



r6. Flowers 3-merous. Sepals very unequal. Corolla with a long tube, 



usually blue. Stamens inserted at the throat ; filaments with a swelHng 



at the base. Stigma 2-parted. Flowers crowded in heads. — Species 3. 



Southern Central Africa Pycnosphaera Gilg 



Flowers 4 — 5-merous. Sepals not very unequal 17 



17. Flowers 4-merous. Anthers ovate, rarely oblong. Pollen-grains smooth. 



Herbs 18 



Flowers 5-merous. Anthers oblong or linear 21 



rS. Stamens inserted below the middle of the corolla-tube. Calyx 8 — 12- 

 ribbed. Corolla with a narrow tube. Stigma 2-lobed. Dwarf herbs. 

 Flowers solitary or paired in the leaf-axils, sometimes formmg racemes 

 or corymbs. — Species 8. Central Africa. . . Neuro theca Salisb. 

 Stamens inserted at the throat of the corolla. Anthers ovate Flowers 

 small -19 



19. Flowers in dense fascicles. Calyx divided to the middle or below the 



middle. Corolla with 4 scales at the throat. — Species 10. Central 



and South Africa. Some are used medicinally. . . Faroa Welw. 



Flowers in lax cymes. Corolla without scales at the throat. Dwarf 



herbs 20 



20. Stem much branched. Calyx deeply divided. Corolla with a long tube 



and broad lobes. Stigma 2-parted. — Species i. North-west Africa 



(Algeria) Cicendia Adans. 



Stem not or scantily branched. Calyx shortly toothed. Corolla with a 

 rather long tube and narrow segments. Stigma entire or notched. — 

 Species i. North-west Africa. . . . Microcala Link & Hoffmsg 



