96 TETBANDRIA MONOGYNTA. [CL. IT. 



** Flowers of one petal, superior, two-seeded. 



6. RITBIA. 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. Corona 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. Corona tubular, spreading. Stamens short. 



Capsule one-celled, bursting all round. 



**** Flowers of four petals. 



11. EPIME'DIUM. Nectaries four, lying on the petals. Pod 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. IS'NARDIA. Calyx four-cleft, superior. Capsule quadrangu- 



lar, four-celled, crowned by the calyx. 



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

 Stamens 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 Cuscu(a.~) 



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. SAGI'NA. Petals four. Capsule one-celled, four-valved. 



20. MCE'NCHIA. Petals four. Capsule one-celled, one-valved. 

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



21. TILLJE'A. Petals four, three, or five. Capsules several, 



Seeds several. 



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



naked, sessile. 



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



(Cerastium.) 



TETRANDRIA. MONOGYNIA. 



1. DI'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. 



