--Retained publication information from the printed edition: this eBook
is public-domain in the country of publication.
--Corrected a few palpable typographical errors.
--Slightly relocated species images before descriptive text, and flower
color after the descriptive text, where they had been dislocated
because of page layout issues in the printed exemplar.
--In the text versions only, text in italics is delimited by
_underscores_.