What does alkanet mean?
The definition of alkanet
Al”ka*net, n.
Etym: [Dim. of Sp. alcana, alhe, in which al is the Ar. article. See Henna, and cf. Orchanet.]

1 (Chem.)
A dyeing matter extracted from the roots of Alkanna tinctoria, which gives a fine deep red color.
2 (Bot.)

(a) A boraginaceous herb (Alkanna tinctoria) yielding the dye; orchanet.
(b) The similar plant Anchusa officinalis; bugloss; also, the American puccoon.