Hayes, John L. (John Lord), 1812-1887 · Boston : Press of John Wilson and Son · leaf 19
9 NOTES UPON INDIGO. … The principal source of the indigo of commerce is the Indigo- fera tinctoria. The accompanying figure is a correct represen- tation of the plant, and we may dispense with a description of its botanical characters, observing only that the plant has a half woody stem, and rises to the height of from…
Indigo · Dyes and dyeing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Omnia D. And. Alciati Emblemata : ad qvae singula praeter concinnas acutásque inscriptiones, lepidas & expressas imagines, ac caetera omnia, quae prioribus nostris editionibus cùm ad eorum distinctionem, tum ad ornatum & correctionem adhibita continebantur, : nunc primùm perelegantia persubtiliaq́ [ue] (1564)](https://img.insideoutlibrary.com/img/200/ia-omniadandalciati00alci-240-245.webp)
