42 THE HISTOLOGICAL DISTRIBUTION [CH. 



Caryophyllaceae. In Alsinoideae always subepidermal ; in Silen- 

 oideae usually epidermal, at least as regards origin. Exceptions are 

 species of Dianthus, and, according to Wulff, Silene acaulis. Also 

 subepidermal in stem of Saponaria. 



Ranunculaceae. Subepidermal nearly all through. Epidermal in 

 Paeonia coriacea, Anemone Hepatica, A. japonica and A. Pulsatilla. 



Berber! daceae and Papaveraceae. Subepidermal. 



Cruciferae. Subepidermal except in Camelina silvestris, Bray a, 

 Draba verna, Alyssum, Farsetia, Malcomia. 



Crassulaceae. Anthocyanin epidermal ; in epidermal idioblasts and 

 in parenchymatous sheaths of vascular bundles. 



Saxifragaceae. Localisation more indefinite in Saxifraga, but 

 appears to start from the epidermis, at least in young leaves. In 

 spring leaves of Ribes, epidermal; in autumnal, subepidermal. 



Rosaceae. In spring leaves in general, anthocyanin in epidermis; 

 in autumnal leaves, anthocyanin in the ground tissue. Subepidermal 

 in spring leaves of Cotoneaster, Cydonia, Pyrus, Photinia, Amelanchier. 



Leguminosae. In general subepidermal but found in the epidermis 

 in Acacia, Mimosa, Cercis, Gymnocladus, Gleditschia, Lupinus, Medicago, 

 Trifolium, Indigofera, Glycyrrhiza, Lourea, Onobrychis. 



Geraniaceae. In young leaves epidermal, in older, subepidermal. 



Tropaeolaceae, Linaceae, Polygalaceae. Subepidermal. 



Euphorbiaceae. Generally subepidermal, epidermal in Croton, 

 Ricinus and some Euphorbia spp. 



Anacardiaceae. In Pistacia and Rhus, anthocyanin epidermal in 

 spring leaves, subepidermal in autumnal leaves. 



Aceraceae. Subepidermal in Acer, but epidermal in the red-leaved 

 variety. 



Vitaceae. Spring leaves epidermal, autumnal subepidermal. 



Tiliaceae. Subepidermal. 



Malvaceae. Epidermal. 



Theaceae, Hypericaceae and Violaceae. Ground tissue. 



Begoniaceae. Epidermal in leaves, and sometimes in certain 

 spongy parenchyma cells. 



Lythraceae and Myrtaceae. Subepidermal. 



Oenotheraceae. In Oenotkera, Epilobium, Godetia, Gaura, Circaea, 

 usually epidermal. Subepidermal in autumnal leaves of Jussieua, 

 Chamaenerium, Fuchsia. 



Umbelliferae. Subepidermal, but epidermal in Eryngium amethys- 

 tinum, and in stem of Chaerophyllum temulum, and Conium maculatum. 



