PLATE I. 



Fig, 1. Commelina nudiflora L. A seedling, natural size. C=the seed with the apex of the cotyledon inclosed; 



H = the hypocotyl; S=the sheath of the cotyledon ; R=the primary root; r=two lateral roots; P=the 



first stem-internode; L 1 and L a =the first green leaves. 

 Fig. 2. Same species. Basal portion of a flowering specimen, natural size. I'-P=the first three stem-internodes. 

 Fig. 3. Same species. A flower-bearing shoot, natural size. A=internode of main stem; B=internode of axillary 



shoot; L'=leaf borne on main stem; I 1 -I 2 =inflorescences. 

 Fig. 4. Same species. Diagram of the shoot B. For explanation see the text. 

 Fig. 5. Rhizome of Coinimiiini hiiiilln Vaiil, natural size. 

 Fig. 6. Same species; a fore-leaf, seen from the front, natural size. 

 Fig. 7. Same species; a fore-leaf, removed from the branch and seen from the back, natural size. 



PLATE II. 



Fig. 8. Commelina Virginwa L. The rhizome with the base of an aerial shoot, natural size. P 1 -P 2 =fore-leaves; 



A'=continuation of main stem; A 2 =an axillary stem; L 1 -L 2 =scale-like leaves; L 3 =scar of stem-leaf. 

 Fig. 9. Same species. Diagram of the aerial shoot, figured in Fig. 8. For explanation see the text. 

 Fig. 10. Same species. A rhizome, natural size. A =basal stem-internode from the previous year; A 1 =basal portion 



i if aerial stem of this year; P=the fore-leaf; L 1 -L 2 =scale-like leaves. 



Fig. 11. Same species. Diagram of the si t, figured in Fig. 10. For explanation see the text. 



Fig. 12. Tradescantia rosea Vent., a rhizome, natural size. I 1 -l 5 =the intemodes of the rhizome; I 6 =the basal 



internode (above ground) of the main stem; S'-S*=axillary floral shoots; P= fore-leaves; L 1 -L 2 =green 



leaves. 

 Fig. 13. Same species. Diagram of the axillary floral shoot S 3 figured in Fig. 12. For explanation see the text. 



PLATE III. 



Fig. 14. Commelina nudiflora L. A secondary root of the seedling, transverse section. End.=endodermis; P=Peri- 

 cambium; II = hadrome; PH = proto-hadrome; PL=proto-leptome. X 744. 



Fig. 15. Same species. A lateral root of the seedling; letters as above. X 744. 



Fig. 16. Same species. A secondary root of fullgrown specimen, transverse section; letters as above. X 744. 



Fig. 17. Same species. A secondary root of fullgrown specimen, transverse section. Ep. =epidermis; Ex.=exo- 

 dermis. X 480. 



Fig. 18. Same species. A secondary root, transverse section; letters as above. All the proto-hadrorue-vessels are 

 located inside the pericambium. X 744. 



PLATE IV. 



Fig. Id. Commelina nudiflora L. The hypocotyl of the seedling, transverse section. End.=endodermis. X 480. 



Fig. 2o. Same species. The basal internode I 1 , transverse section. End. =endodermis. X 480. 



Fig. 21. Same species; stomata from the stem. X 360. 



Fig. 22. Same species; transverse section of part of stem-leaf. Ep.=epidermis. X 744. 



Fig. 23. Same species; transverse section showing the pneumatic tissue. X 480. 



PLATE V. 



Fig. 24. Same species; stomata of the leaf. X 360. 



Fig. 25. Same species; raphide-rells from the leaf. X 480. 



Fig. 26. Same species; the midrib of the leaf, transverse section; P=parenehyma sheath. y 744. 



Fig. 27. Same species; transverse section of a marginal vein from the leaf, letter ;is above. ■ 744. 



Fig. 28. Commelina hiriella V ahl. A stoma from the stem. X 480. 



Fig. 29. Same species. Tangential section of root, showing a cell of exodermie with foldings. X 480. 



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