128 POWDERED VEGETABLE DRUGS 



.Large reticulate ducts 



Numerous prismatic crystals Glycyrrhiza 



Numerous aggregate crystals. Stillingia 



No large reticulate ducts 



Starch simple 



Large porous ducts (bark) Rubus 



. . . Ducts medium 



Porous Euonymus 



Reticulate Althaea 



Yellow tracheids Hydrastis 



Starch compound 



Bast plentiful, typical Gossypium 



Porous tracheids plentiful , Krameria 



Starch sparingly present or wholly wanting 



Ducts present 



Annular and spiral ducts Triticum 



. Annular ducts wanting 



Large reticulate ducts Gentiana 



Large porous ducts 



Abundant wood fibers Quassia 



Some tracheids. Parenchyma Gelsemium 



Ducts wanting 



Bast cella large, sclerenchymatous Cinchona 



. - . . Bast cells branching 



Large elongated prismatic crystal Quillaja 



. Medium prismatic crystals Viburnum op. 



Aggregate crystals Prunus virg. 



Bast cells not branching, typical 



Crystal bearing fibers present 



Numerous aggregate crystals Salix 



Aggregate crystals few Frangula 



Crystal bearing fibers wanting 



Characteristic twin crystals Ulmus 



Crystals few or wanting. Mezereum 



.... Sclerenchyma cells and bast fibers wanting 



Large thin-walled parenchyma. No wood fibers Colocynth 



...... Wood fibers and tracheids predominating 



Tracheids with bordered pits 



Fibers colorless ". Pinus 



Fibers reddish brown Santalum rubrum 



Simple pores 



Fibers olive green (wood) Guaiacum 



Fibers pale yellow, nearly colorless Quassia 



Wood fibers and tracheids comparatively few 



No starch present 



Inulin present 



Ducts large 



Reticulate . . Taraxacum 



Porous Cichorium 



Ducts medium, reticulate 



