Wakeman—Pigments of Flowering Plants. 841 
sativum, Apium graveolens , and perhaps in other species of urn- 
bellifera. 
Apigenin forms crystals of a pale yellow color which melt 
at 212-215. It is difficultly soluble in water and in ether, more 
readily in alcohol. Alkalies dissolve it with a yellow color. In 
alcoholic solution it yields with lead acetate a yellow precipi¬ 
tate, with ferric chloride a red brown coloration. 
Acacetin, a monomethyl ether of apigenin was named by 
Perkin 1 who first obtained it from the leaves of Robina pseud- 
acacia. 
Acacetin occurs in the leaves of the false acacia, Robina pseud- 
acacia. It forms almost colorless needle like crystals which 
dissolve in alkaline solutions with a pale yellow color. From 
alcoholic solutions it is precipitated by lead acetate. With 
ferric chloride it gives a reddish brown color. It forms a 
diacetyl derivative which crystallizes in colorless needles which 
melt at 195-198. Fused with alkalies, acacetin yields phloro- 
glucin and parahydroxybenzoic acid. 
Galangin, — Trihydroxy — 1, 3, —flavone or 
Dihydroxy-—1, 3—flavonol. 
Galangin was first obtained by Brandes, 1 in 1839, together 
with kaempferid, from Galanga root, Alpinia officinarum. It 
was not, however, recognized by him as a distinct compound, 
and it was not until Jahns, 2 in 1881 showed that the kaempferid 
of Brandes was composed of a mixture of three substances which 
he called kaempferid, galangin, and alpinin, that galangin was 
actually isolated. In a later study (1900) of the colored com¬ 
pounds of Galanga root, Testoni 3 met with nothing correspond- 
1 Proc. Chem. Soc., 16, p. 45; Jr. Chem. Soc., 77, p. 430. 
1 Arch, der Pharm., (2) 19, p. 52. 
2 Ber., 14, p. 2305; 2807; Arch, der Pharm., 220, p. 161. 
3 Gazz. chim. ital., 30, (2) p. 327. 
