Anchusa root TS, darkfield photomicrograph, stained section
The genus Anchusa belongs to the tribe Boragineae of the borage family (Boraginaceae). It includes about 40 species. These species grow in Europe, North Africa, South Africa and Western Asia. They are introduced in the USA. They consist of annual plants, biennial plants and perennial plants with the general characteristics of the borage family. They are generally herbs, covered with bristly hairs. The leaves are simple or undulate, covered with stiff hairs. The small radially symmetrical flowers are sapphire blue and retain their colour a long time. The plants show numerous flowers with 5 sepals, united at their bases, and 5 petals forming a narrow tube facing upwards. The flowers grow in several axillary cymes, simple or branched, or are clustered at the end. The flowers are much frequented by bees. The roots of Anchusa (just like those of Alkanna and Lithospermum) contain anchusin (or alkanet-red ), a red-brown resinoid colouring matter. It is insoluble in water, but soluble in alcohol, chloroform and ether. Anchusa species are used as food plants by the larvae of some Lepidoptera species including Coleophora onosmella.
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Photo credit: © Scenics & Science / Alamy / Afripics
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Keywords: alkanet-red, anchusa, anchusin, darkfield, micrograph, microscope, osmosis, photomicrograph, purple, root, section, stained, ts, violet
