= Solution
\b[The required sequence is fresh <flowers>; sliced and dried <bulb>; unexpanded <petals>; <heartwood>; <seeds>; expressed seed <fat>; expressed seed <oil>; and fresh and dried <root (botany)>.] The <plant> organ, its state, and the actual official material must all be specified.
* \b[<Sambucus nigra>: fresh <flowers>.] The official article is \i[Sambuci flores], elder flowers, gathered from the native <plant>. The flower stalks are separated when making elder-flower water; the preparation also allows an equivalent quantity of flowers preserved fresh with common salt. Neither elder berries nor elder bark answers the botanical part asked here.<British Pharmacopoeia by the General Medical Council (1867)>[“Sambuci flores”, p. 274; “Aqua sambuci”, p. 45]{ref}
* \b[<Squill>: the sliced and dried <bulb>.] The historical botanical source is \i[Urginea scilla], also identified there as \i[Scilla maritima]. The medicinal slices consist of the fleshy bulb scales; this is an underground shoot structure, not a <root (botany)>. The official article is \i[Scilla].<British Pharmacopoeia by the General Medical Council (1867)>[“Scilla”, pp. 279–280]{ref}
* \b[<Rosa gallica>: the fresh and dried unexpanded <petals>.] These are \i[Rosæ gallicæ petala], the red-rose material. “Unexpanded” refers to collection before the flower has opened fully. The <petals> must be distinguished from the <rose hip> used for a different official preparation.<British Pharmacopoeia by the General Medical Council (1867)>[“Rosæ gallicæ petala”, red-rose monograph]{ref}
* \b[<Pterocarpus santalinus>: the sliced or rasped <heartwood>.] This is \i[Pterocarpi lignum], red sandalwood. The answer is the wood, rather than <bark> or the exudate known as <kino>. Botanical relationship between two medicinal materials does not make their official definitions interchangeable.<British Pharmacopoeia by the General Medical Council (1867)>[“Pterocarpi lignum”, p. 261]{ref}
* \b[<Physostigma venenosum>: the <seed>.] \i[Physostigmatis faba], the <Calabar bean>, is botanically a <seed>, not the entire pod. Its two large <cotyledons> lie inside a hard seed coat. The official alcoholic extract is made from the powdered <seed>.<British Pharmacopoeia by the General Medical Council (1867)>[“Physostigmatis faba”, pp. 233–234; “Extractum physostigmatis”, p. 126]{ref}
* \b[<Theobroma cacao>: the concrete <oil> obtained by expression and heat from the ground <seeds>.] The official article is \i[Oleum theobromæ], <cocoa butter>. Naming the <seed> gives its source organ, but omits the important fact that the official pharmaceutical material is the separated <fat>. It is distinct from <coconut oil>.<British Pharmacopoeia by the General Medical Council (1867)>[“Oleum theobromæ”, p. 229]{ref}
* \b[<Croton tiglium>: the <oil> expressed from the <seeds>.] The official material is \i[Oleum crotonis], <croton oil>, rather than the whole <plant> or an unspecified <leaf> preparation. The <seeds> are its source; the expressed <oil> is the article used in the official formulations.<British Pharmacopoeia by the General Medical Council (1867)>[“Oleum crotonis”, p. 222]{ref}
* \b[<Taraxacum officinale>: the fresh and dried <root (botany)>.] The official article is \i[Taraxaci radix], dandelion root, called \i[Taraxacum dens leonis] in the 1867 standard, gathered between September and February from British meadows and pastures. The collection season and fresh/dried distinction belong to the historical standard; the answer is not the <leaves> or flowers.<British Pharmacopoeia by the General Medical Council (1867)>[“Taraxaci radix”, p. 317]{ref}
The names in the paper sometimes use the shorter terminology of the first <British Pharmacopoeia>, whereas the 1867 edition explicitly renamed many entries to identify the medicinal organ. Its alteration list, for example, maps \i[Sambucus] to \i[Sambuci flores], \i[Pterocarpus] to \i[Pterocarpi lignum], and \i[Taraxacum] to \i[Taraxaci radix].<British Pharmacopoeia by the General Medical Council (1867)>[“Articles the names of which have been altered”, pp. xix–xxi]{ref} That is a nomenclature change, not permission to choose any part of the named <plant>.
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