Glands of the Plumhagineae . 255 
remarkable coincidence that they affect maritime situations 
and are mucilaginous in character. The Tamariscineae have 
close affinity with the Frankeniaceae and ‘prefer sea-shores, the 
margins of brackish lakes, the banks of rivers and torrents, in 
sandy or clayey soils/ The colleters on the ochreae of 
Polygoneae ] and the capitate hairs of Plantagineae 1 2 are 
worthy of remark, both orders being associated with Plumba- 
gineae. The mucilaginous condition of the former recalls the 
similar appearance of herbaceous Statices, and the leaves of 
many of the latter simulate in form the same organs in certain 
Armerias and Statices to a remarkable degree. 
I am deeply indebted to Prof. Bayley Balfour, Prof. MTntosh, 
Dr. Cleghorn, the authorities of the Royal Gardens, Kew, and 
of the Jardin Botanique de l’Ftat, Brussels, for material, and 
for opportunity of consulting books of reference. My thanks 
are especially due to Prof. Bayley Balfour for personal en- 
couragement during the early part of the work in Edinburgh, 
and to Prof. MTntosh for many kind offices during the 
continuance of it in St. Andrews, and the elaboration of the 
results as a thesis. Mr. Daydon Jackson has kindly given 
me the authorities for some species. 
1 Hanstein, Ueber die Organe der Harz- und Schleimabsonderung in den 
Laubknospen, Bot. Zeit., 1868. 
2 Vesque, Caracteres des Gamopetales, Ann. Sci. Nat., ser. 7, tome I, 1885, p. 
349 - 
