192 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. X, NO. 6. 



PLATE VI. 



Fig. 30. Commelina nudiflora L. Epidermis with warts, from dorsal face of leaf. X 480. 



Fig. 31. Commelina hirtella Vahl. Stoma from the leaf. X 360. 



Fig. 32. Same species. Stoina from the leaf. X 360. 



Fig. 33. Same species. Stoma from the stem. X 360. 



Fig. 34. Same species. A secondary root, transverse section; C = the cortex; End. = endodermis; P = pericam- 



bium; PL = proto-leptome; PH = proto-hadrome. X 480. 

 Fig. 35. Same species. Epidermis from the stem, showing stomata and two kinds of hairs. X 360. 

 Fig. 36. Same species. Cells with crystals from the stem (cortex). X 480. 

 Fig. 37. Commelina Virginica L. Epidermis of ventral face of leaf-blade. X 360. 



PLATE VII. 



Fig. 38. Commelina hirtella Vahl. Transverse section of inner portion of stem, showing the pith, with crystals and 



very wide intercellular spaces. X 360. 

 Fig. 39. Commelina Virginica L. Hair from the leaf-sheath. X 360. 

 Fig. 40. Same species. Stomata from the leaf. X 360. 

 Fig. 41. Same species. Transverse section of the root, showing epidermis (Ep. ), exodermis (Ex.), and sterei'ds. 



X 360. 

 Fig. 42. Tradescantia rosea Vent. Transverse section of the root. End. = endodermis; P = pericambium; PH — 



proto-hadrome; PL = proto-leptome. X 480. 

 Fig. 43. Tradescnutin Virginicul^. A cell of exodermis of root, showing the foldings of the wall. X "44. 

 Fig. 44. Tradescantia rosea Vent. Transverse section of fore-leaf, showing epidermis and cuticle. X 840. 

 Fig. 45. Same species. A stoma from the rhizome. X 360. 



PLATE VIII. 



Fig. 46. Tinantia anomala (Tore.) Clarke. Diagram of the shoot. L'-L" = green leaves ; P'-P 3 = fore-leaves; there 

 is one shoot in the axil of L 2 , beginning with the fore-leaf P 1 , and another shoot in the axil of L 3 , 

 beginning with the fore-leaf P 2 . In the axil of P 2 is a third shoot, which begins with the fore-leaf P 3 . 



Fig. 47. Tradescantia Warszewicziana K. et B. Epidermis of leaf, transverse section. X 480. 



Fig. 48. Same species. Epidermis of leaf, viewed en face. X 480. 



Fig. 49. Weldenia Candida Schult. fil. Diagram of the shoot; /'-/ 5 = scale-like leaves of stem underground; L'-L 5 = 

 green leaves; 6-13 = the innermost leaves, which surround the inflorescence. 



Fig. 50. Same species. Transverse section of central-cylinder of root. Letters as above. X 480. 



Fig. 51. Same species. Transverse section of central-cylinder of root. Letters as above. There are two proto-leptome- 

 cells (PL). X 480. 



Fig. 52. Same species. Hair from the leaf. X 360. 



Fig. 53. Same species. Stoma from the leaf. X 360. 



