48 TETRANDRIA. 



4. ASPERULA. Cor. funnel-shaped. Fruit not crowned with 



the cal. 



3. SHERARDIA. Cor. funnel-shaped. Fruit crowned with the cal. 

 ftf Flowers of 1 petal, 2- or many-seeded, inferior. 



6. PLANTAGO. Cor. 4-cleft, the segments reflexed. Stam. very 

 long. Caps, of 2 cells, 2- or many-seeded, bursting all round 

 transversely. 



7. CENTUNCUUJS. Cor. tubular, 4-cleft. Slam, short. Caps. 

 of I cell, many-seeded, bursting all round transversely. 



"H'tt Flowers of 4 petals. 



9. EPIMEDIUM. Cal. of 4 leaves, caducous. Pet. inferior, with 

 an inflated nectary on the upper side. Pod of I cell, 2 valves, 

 many seeds. 



10. CORNUS. Cal. of 4 teeth. Petals without a nectary, su- 

 perior. Nut of the drupe with 2 cells and 2 seeds. 



"** Perianth single. 



11. PARTETARIA. Perianth 4 -fid., inferior. Filaments at first 

 incurved, then expanding with an elastic force. Fr?/z/ 1 -seed- 

 ed, inclosed in the enlarged perianth. (One or more of the 

 central florets destitute of stamens.) 



12. ALCHEMIJLLA. Perianth inferior, 8-cleft, 4 alternate and 

 outer segments the smallest. Fruit 1 -seeded, surrounded by 

 the perianth. 



8. SANGUISORBA. Perianth 4-lobed, superior, coloured, at the 

 base having 4 scales or bracteas. Fruit 1 2-seeded, sur- 

 rounded by the persistent base only of the perianth. 



2. DIGYNIA. 

 (Cuscuta, PENT. DIG.) 

 3. TETRAGYNIA. 



13. ILEX. Cal. 4 5 -toothed. Cor. rotate, 4 5-cleft. Stigmas 

 4, sessile. Berry spherical. Nuts 4, 1 -seeded. (Some 

 flowers destitute of pistil.) 



16. SAGINA. Cal. of 4 leaves. Petals 4 (shorter than the cal.) . 

 Caps, of 1 cell, 4 valves. 



17. MCENCHIA. Cal. of 4 leaves. Petals 4 (as long as the 

 cal.). Caps, of 1 cell, opening with several teeth at the ex- 

 tremity. 



18. RADIOLA. Cal, many-cleft. Petals 4. Caps, superior, 

 8-valved, 8-celled. Seed solitary (Sm.). 



14. POTAMOGETON. Perianth single, of 4 leaves. Anthers 

 sessile, alternating with the dvisions of the perianth. Nuts 4, 

 1 -seeded, sessile. (Flowers numerous, on a spadix, and spa- 

 thaceous.) 



15. RUPPIA. Perianth 0. Drupes 4, pedicellate, their nut* 1- 



