96 TETRANDRIA MONOGYNIA. ^CL. IV. 



** Flower t of one petal, superior, two-seeded. 



6. RU'BIA. Corolla bell-shaped. Fruit pulpy. 



5. GA'LIUM. Corolla wheel-shaped. Fruit dry, crowned by the 



calyx. 



4. ASPE'RULA. Corolla tubular. Fruit not crowned. 

 3. SHERA'RDIA. Corolla tubular. Fruit crowned. 



*** Flowers of one petal, inferior. 



7. E'XACUM. Corolla salver-shaped, spreading. Stamens shorter 



than the limb. Capsule two-valved, separating at the top. 



8. PLANTA'GO. Corolla with the segments reflected. Stamens very 



long. Capsule two-celled, bursting all round. 



9. CENTU'NCULUS. Corolla tubular, spreading. Stamen* short. 



Capsule one-celled, bursting all round. 



**** Flowers of four petals. 



11. EPIME'DIUM. Nectaries four, lying on the petals. Pud one- 



celled, many-seeded. Calyx deciduous. 



12. CO'RNUS. Nectaries none. Drupe inferior. Nut two-celled. 



(Cardamine. Senebiera.) 

 ** No petals. 



13. PARIETA'RIA. Calyx four-cleft, inferior. Stamens elastic. Seed 



inclosed in the elongated calyx. Some flowers destitute of stamens. 



14. ISNA'RDIA. Calyx four-cleft, superior. Capsule quadrangular, 



four-celled, crowned by the calyx. 



10. SANGUISO'RBA. Calyx four-cleft, superior, coloured. Stamen* 

 dilated upwards. Capsule quadrangular, one-celled, not bursting. 



15. ALCHEMI'LLA. Calyx eight-cleft, inferior. Fruit one-seeded, 



surrounded by the calyx. 



Order II. DIGYNIA. Two Pistils. 

 (Alchemilla, some species of Gentiana and Cuscuta.) 



Order III. TETRAGYNIA. Four Pistils. 



16. I'LEX. Corolla wheel-shaped, four or five-cleft. Berry round, four- 



seeded, some flowers destitute of pistil. 



19. SAGl'NA. Petals four. Capsule one-celled, four-valved. 



20. M(EN'CHIA. Petals four. Capsule one-celled, one-valved. 

 22. RADIO'LA. Petals four. Capsule eight-celled', eight-valved. 



21. TILL^E'A. Petals four, three or five. Capsules several. Seeds 



several. 



17. POTAMOGE'TON. Petals four. Calyx none. Seeds four, naked. 



sessile. 



18. RU'PPIA. Petafcnone. Calyx none. Seeds four, stalked. 



( Cerastium. ) 



TETRANDRIA. MONOGYNIA. 



1. Dl'PSACUS. TEASEL. 



Involucre many-flowered, of many spreading, permanent leaves. 

 Calyx superior, double, short, undivided. Corolla of one petal, 

 tubular; the limb four-lobed, the outer lobe larger. Filaments 



