DESCRIPTION OF THE PLATES. 333 



Fig. 



5. A flower of Datura fasttiosa, showing a triple corolla. 



6 and 7. A monstrosity of Gentiana purpurea, in which the ovarium is formed of 

 two rows of carpels, all bearing ovules ; the outer row has four, the inner two 

 carpels. 



8, 9, 10, and 11. Different states of the flowers of Phlox amaina from the same plant, 

 showing the different combinations of the petals, from their being nearly per- 

 fectly free, to their usual gamopetalous state. 



PLATE XIX. 

 JEstivations. 



In these figures, j designates the sepal?, p the petals, / the tepals, and b the bracts. 



Fig. 



1. Papaver Rhevas ; petals rumpled, sepals imbricate. 



2. Muliernia pinnata; petals contorted, sepals valvate. 



3. Tradescantia Virginica; petals imbricate, sepals valvato. 



4. Philadelplius coronurius ; petals contorted, sepals valvate. 



5. Cistus albidus; petals contorted, sepals quincunxially imbricate. 



6. Clematis florida ; sepals induplicate; s. one seen from the inner side. 



7. Sparmannia Africana ; petals half induplicate, half imbricate, sepals valvate. 



8. Spartium junceum; petals in vexillary aestivation; v. (vexilla), the standard ; 



a. a. (alae). the wings ; c. (carina), the keel. 



9. Daphne alpina ; peritjone imbricate. 



10. M. Irosideras lanceolata ; sepals and petals quincunxially imbricate. 



11. Plantago media ; tepals imbricate. 



12. ' iota arvensis ; sepals and petals quincunxially imbricate. 



13. Poterium Sanguisorba ; sepals in regular aestivation. 



14. Pancratium maritimum ; the outer row of the perigone formed of curved pieces, 



the inner, of flat and valvate enes. 



15. Hmja carnusa ; petals valvate. 



PLATE XX. 



Structure of Oraries with a central placenta. 



Fig. 



1. Stellaria graminea. 



2. Cerastium arvense. 



3. Arenaria tenuifolia. 



4. Arenaria marina. 



5. Silene, (a species very near .■?. conica.) 



6. Silene nutans. 



7. Claytonia perfoliata. 



8. Telephium Impcrati. 



PLATE XXI. 



Monstrosities. 



Monstrosity of an apple, produced by two (lowers united by their peduncles. Cen- 

 taurea with the peduncles united. 



PLATE XXII. 



Germinations. 



Fig. 



I. Euphorbia Hclioscopia ; a monstrosity with four cotyledons, formed by the. union 

 of two embryos. 



