SYNOPSIS OF THE GENERA. 



many-leaved involucrum. Involucellum with four sides 

 and eight little excavations, ^alyx cup-shaped, thickly 

 clothed with short rigid hairs. Receptacle with spiny glu- 

 maceous bracteae, shorter than the leaves of the involucrum. 



2. Knau'tia, [Page 176,] Flowers in heads, surrounded by a 



many- leaved involucrum. Involucellum compressed, with 

 four little excavations. Calyx cup-shaped. Fruit placed 

 upon a short stalk. Receptacle bristly. 



3. ScABio'sA, [Page 177.] Floivers in heads, surrounded by a 



many -leaved involucrum. Involucellum nearly cylindrical, 

 with eight little excavations and a membranous plaited 

 limb. Calyx with a limb consisting of about five bristles. 



** Perianth double. Corolla of one piece, superior. Seeds two, 

 Leaves in Whorls. 



4. Galium, [Page 178.] Corolla wheel or bell-shaped, four or 



five cleft. Fruit a dry indehiscent pericarp, with two cells 

 and two seeds, not crowned by the calyx, 



5. Ru BiA, [Page 188.] Corolla rotate or campanulate, with from 



three to five spreading segments. Fruit a succulent, 

 smooth, two-lobed berry. 



6. Sherar'dia, [Page 189.] Corolla funnel-shaped with four 



segments. Fruit crowned with the persistent teeth of the 

 calyx. 



7. AsPER'uLA, [Page 189.] Corolla funnel-shaped, with from 



three to four segments. Fruit not crowned with the calyx. 



*** Perianth double. Corrolla of one piece inferior. Seeds 

 two, or many. 



8. ExACCM, [Page 192.] Calyx of one piece, with a four-cleft 



extremity. Corolla four-cleft salver-shaped, with a globose 

 tube. Anther bursting longitudinally. Stigma capitate, 

 entire. Capsule one-celled, two valved. 



9. Planta'go, [Page 192.] Corolla with four reflexed segments. 



Stamens very long. Capsule of two or four-cells, mem- 

 branous, two or many-seeded, bursting with a transverse 

 incision. 



10. Centuk^cclus, [Pago 196.] Corolla of one piece, the tube 



swelling, limb four-cleft. Stamens short. Capsule of one 

 cell, many-seeded, bursting with a transverse incision. 



