Table 1.

Histochemical reactions of Lamium album subsp. album corolla trichomes.

Target Compounds	Stain Reagent	Reaction Color	Trichomes			Papillae	Epidermis Cells
			Peltate	Capitate	Non-Glandular
General phenolic compounds	FeCl3	black, brown	+	+	nd	+	+
	Toluidine blue O	green or blue	+	+	+	+	+
Tannins	Potassium dichromate	brown	+	+	nd	+	-
	Toluidine blue O	deep blue	+	+	+	+	+
Phenolic acids	Autofluorescence UV	light blue	+	+	-	+	+
Flavonoids	AlCl3 under UV	yellow	+	+	+	+	+
Pectins	Toluidine blue O	purple or pink	+	+	+	+	-

+ present, —absent, nd not determined.