310 



THE PLANT COVEUIXii <>F OCHACOKE ISLAM). 



a companion cell and a band of four or five eribrile parenchyma 



cells. 1 



Leaf anatomy of salt-ntarah species. 



[The sin" X indicates presence of character; ± its imperfect development.] 





Leaf. 



Epidermis. 





Cuticle. 



m 



Species. 



J 



ffl 



(8 

 U 

 9 



A 

 S 



X 



ffi 



*3 



1" 



M 



o 



3 



a 



u 



A 



t. a 



£ so 



31 



Triif lucbin striata 





X 



X 





X 





Spartina stricta ' 















X 



X 

 X 



X 

 X 









Sesuvium maritiiumu 





X 

 X 





















X 











Ammania koehnei ...... 



± 

 ± 













Vincetoxicum palustre 









X 

 X 



X 

 X 

 X 

 X 

 X 

 X 

 X 







Lippia nodiflora 



± 











X 

 X 



± 



X 

 X 

 X 



± 











Iva frutescens 







X 

 X 

 X 



X 

 X 

 X 

 X 



X 







Solidago sempervirens 



















Baccharia hallmifolia > 





X 

 X 



X 











' 











1 Characters given under species of the "sand strand," page 289. 



1 liorrichia arboresceus (compare Warming, Halofyt-Studier, p. 912) is a very 

 similar but larger plant of the tropical American strand. It differs from B.fruten- 

 cens in the following particulars, the characters being taken from material col- 

 lected in South Florida and Porto Rico: 



Hairs much thicker- walled, entirely disappearing in old (more than 1 year 

 old?) leaves; stomata on both surfaces, with guard cells slightly prominent on the 

 ventral face, less numerous and with guard cells slightly sunken on the dorsal 

 face; epidermal cell walls, especially the outer, thick; palisade interrupted both 

 above and below by extensions of the water-storage tissue, which on the ventral 

 side ultimately disorganize and form large lacunes; hypodermal collenchyma 

 occurring where the palisade is interrupted on the ventral side; collenchyma 

 taking the place of stereome as supports of the veins, especially strong on the lep- 

 tome side. 



From Warming's description and figure of />'. arborexcats my specimens showed 

 important differences: (1) The presence of hairs (elsewhere in the same paper 

 Warming mentions their occurrence in this species); (2) stomata with guard cells 

 slightly prominent on the ventral surface (Warming writes "stomata sunken"); 

 (3) collenchyma present and strongly developed: (4) mestome bundles in three 

 planes (one according to Warming), some small tines being situated near the upper 

 and the lower epidermis, while the midveiii is central in the water-storage tissue. 



