Amaryllidoideae


Amaryllidoideae is a subfamily of monocot flowering plants in the family Amaryllidaceae, order Asparagales. The most recent APG classification, APG III, takes a broad view of the Amaryllidaceae, which then has three subfamilies, one of which is Amaryllidoideae, and the others are Allioideae and Agapanthoideae. The subfamily consists of about seventy genera, with over eight hundred species, and a worldwide distribution.

Description

The Amaryllidoideae are herbaceous, perennial flowering plants, usually with bulbs. Their fleshy leaves are arranged in two vertical columns, and their flowers are large. Most of them are bulbous geophytes and many have a long history of cultivation as ornamental plants. They are distinguished from the other two Amaryllidaceae subfamilies by their unique alkaloidal chemistry, inferior ovary, and hollow style.

Taxonomy

History

Pre-Darwinian

The name Amaryllis had been applied to a number of plants over the course of history. When Linnaeus formerly described the type genus Amaryllis, from which the family derives its name, in his Species Plantarum in 1753, there were nine species with this name. He placed Amaryllis in a grouping he referred to as Hexandria monogynia containing 51 genera in all in his sexual classification scheme.
These genera have been treated as either liliaceous or amaryllidaceaous over time. In 1763 Adanson placed them in 'Liliaceae' In 1789 de Jussieu placed Amaryllis and related genera within a division of Monocotyledons, using a modified form of Linnaeus' sexual classification but with the respective topography of stamens to carpels rather than just their numbers.
The family Amaryllidaceae was named in 1805, by Jean Henri Jaume Saint-Hilaire. In 1810 Brown proposed that a subgroup of Liliaceae be distinguished on the basis of the position of the ovaries and be referred to as Amaryllideae and in 1813 de Candolle described Liliacées Juss. and Amaryllidées Brown as two quite separate families. Samuel Frederick Gray's A natural arrangement of British plants. grouped together a number of families having in common six equal stamens, a single style and a perianth that was simple and petaloid, within which he separated families by the characteristics of their fruit and seed, such as Amaryllideae, Liliaceae, Asphodeleae and Asparageae.
John Lindley, in his An Introduction to the Natural System of Botany divided the "Monocotyledonous Plants" into two tribes. He then further divided the Petaloidea, into 32 orders, including the Amaryllideae. He defined the latter as "Hexapetaloideous bulbous hexandrous monocotyledons, with an inferior ovarium, a 6-parted perianthium with equitant sepals, and flat spongy seeds" and included Amaryllis, Phycella, Nerine, Vallota, and Calostemma.
By 1846 Lindley had greatly expanded and refined the treatment of the monocots. He placed the Liliaceae within the Liliales, but saw it as a paraphyletic family, being all Liliales not included in the other orders, hoping that the future would reveal some characteristic that would group them better. This kept the Liliaceae. separate from the Amaryllidaceae, which was divided into four tribes, yet both his Amaryllidaceae and Liliaceae contained many genera that would eventually segregate to each other's contemporary orders. The Liliaceae would be reduced to a small 'core' represented by the tribe Tulipeae, while large groups such as Scilleae and Asparagae would become part of Asparagales either as part of the Amaryllidaceae or as separate families. Of the four tribes of the Amaryllidaceae, the Amaryllideae and Narcissea would remain as core amaryllids while the Agaveae would be part of Asparagaceae but the Alstroemeriae would become a family within the Liliales.
Since then seven of Linnaeus' genera have consistently been placed in a common taxonomic unit of amaryllids, based on the inferior position of the ovaries. Thus much of what we now consider Amaryllidoideae remained in Liliaceae because the ovary was superior, till 1926 when John Hutchinson transferred them to Amaryllidaceae.
The number of known genera within these families continued to grow, and by the time of the Bentham and Hooker classification the Amaryllidaceae were divided into four tribes, of which only one still represents the grouping now reflected in Amarylloideae.
In the post-Darwinian era the amaryllids were mainly treated as part of a very large family Liliaceae, although the early twentieth century saw increasing doubts about the inclusion of many of its components, particularly the :wikt:alliaceous|alliaceous elements. Hutchinson also suggested that the elements now included in Amaryllidoideae's parent family could all be placed in one family, although only Cronquist placed all the elements into a very large Liliaceae.

Angiosperm Phylogeny Group

The introduction of molecular methods in the 1990s confirmed the affinity of three major taxa corresponding to Alliaceae, Agapanthaceae and Amaryllidaceae. In 2009 the Angiosperm Phylogeny Group decided to amalgamate the three families, which together form a monophyletic group, into a single family, at first called Alliaceae and then Amaryllidaceae. The three families then became reduced to subfamilies, so that the historical Amaryllidaceae became subfamily Amaryllidoideae. To distinguish this new broader family from the older narrower family it has become customary to refer to Amaryllidaceae sensu APG, or as used by APG, Amaryllidaceae s.l.. as opposed to Amaryllidaceae s.s..
The relationships between the subfamilies within the Amaryllidaceae and the place of Amaryllidoideae is shown in the Cladogram.

Complete resolution of infrafamilial relationships within subfamily Amaryllidoideae has proven difficult. Early studies lacked sufficient resolution for further elucidation of this group. Historically a wide variety of infrafamilial classification systems have been proposed for the Amaryllidaceae s.s.. In the latter twentieth century there were at least six schemes, including Hutchinson, Traub, Dahlgren, Müller-Doblies and Müller-Doblies, Hickey and King and Meerow and Snijman. Hutchinson was an early proponent of the larger Amaryllidaceae, transferring taxa from Liliaceae and had three tribes, Agapantheae, Allieae and Gilliesieae. Traub largely followed Hutchinson, but with four subfamilies, the Amaryllidoideae he then divided further into two "infrafamilies", Amarylloidinae and Pancratioidinae, an arrangement with 23 tribes in total. In Dahlgren's system, a "splitter" who favoured larger numbers of smaller families, he adopted a narrower circumscription than Traub, using only the latter's Amaryllidoideae which he treated as nine tribes. Müller-Doblies described ten tribes. Hickey and King described ten tribes by which the family were divided, such as the Zephyrantheae. Meerow and Snijder considered thirteen tribes, one with two subtribes.
Thus Traub's Amaryllidoideae, which most later authors treated as Amaryllidaceae s.s., became the basis for Amaryllidoideae sensu APGIII. Of the other three subfamilies in Traub's system, Allioideae represents Amaryllidaceae subfamily Allioideae sensu APGIII. Hemerocalloideae was a small subfamily with a single tribe, Hemerocalleae consisting of two genera, Hemerocallis and Leucocrinum. Subsequent research has shown these to be very different taxa, Hemerocallis being placed in the family Xanthorrhoeaceae, while Leucocrinum belongs in Asparagaceae, both part of Asparagales. Finally Ixiolirioideae was another very small subfamily, with two tribes, Gageeae and Ixiolirieae. Gageeae consisted of two genera, Gagea and Giraldiella, which was subsequently merged with Gagea, while Ixiolirieae similarly contained only Ixiolirion and Kolpakowskia belongs in Ixioliriaceae. so only two of his subfamilies now belong in Amaryllidaceae s.l..
Traub 1963
Subfamily: Amarylloideae		Dahlgren 1985Müller-Doblies 1996Meerow 1998Molecular phylogenetics
Infrafamily: Amarylloidinae
Traubieae		HippeastreaeHippeastreae
Traubiinae		HippeastreaeHippeastreae
Traubiinae
ZephyrantheaeHippeastreaeHippeastreae
Zephyranthinae		HippeastreaeHippeastreae
Hippeastrinae
AmarylleaeHippeastreaeAmaryllideae
Amaryllidinae
Hippeastreae
Hippeastrinae		Amaryllideae
Amaryllidinae		Amaryllideae
Amaryllidinae
Griffineae
LycoreaeLycorideaeLycorideaeLycorideaeLycorideae
NarcisseaeNarcisseaeNarcisseae
Narcissinae		NarcisseaeNarcisseae
GalantheaeGalantheaeNarcisseae
Galanthinae
Lapiedrinae		GalantheaeGalantheae
Narcisseae
CrineaeAmaryllideaeAmaryllideae
Crininae
Boophoninae		Amaryllideae
Crininae		Amaryllideae
Crininae
CyrtantheaeHaemantheaeHaemantheae
Cyrtanthinae		CyrtantheaeCyrtantheae
ClivieaeHaemantheaeHaemantheae
Cliviinae		HaemantheaeHaemantheae
Cliviinae
HaemantheaeHaemantheaeHaemantheae
Haemanthinae		HaemantheaeHemantheae
Haemanthinae
GethylleaeHaemantheaeGethyllideaeGethyllideaeHemantheae
Gethyllidinae
StrumarieaeAmaryllideaeAmaryllideae
Strumariinae		Amaryllideae
Amaryllidinae		Amaryllideae
Strumariinae
Infrafamily: Pancratioidinae
Pancratieae		PancratieaePancratieae
Pancratiinae		PancratieaePancratieae
StenomessaeStenomesseaeEustephieae
Stenomessinae
Eustephiinae		StenomesseaeStenomesseae/Eucharideae
Eustephieae
Clinantheae
EuchareaeEucharideaeEucharideae
Eucharidinae
Hymenocallidinae
Hippeastreae
Griffiniinae
Calostemmateae		Eucharideae
Hymenocallideae
Hippeastreae
Stenomesseae/Eucharideae
Griffineae
Hymenocallideae
Calostemmateae
EustephieaeStenomesseaeEustephieae
Stenomessinae
Eustephiinae
Hippeastreae
Hippeastrinae		Stenomesseae
Eustephieae
Hippeastreae		Stenomesseae/Eucharideae
Hippeastreae
Hippeastrinae
Traubiinae
Clinantheae
Eustephieae

The further application of molecular phylogenetics produced a complex picture that only partially related to the tribal structure considered up to that date, which had been based on morphology alone. Rather Amaryllidaceae resolved along biogeographical lines. A predominantly South African clade identified as Amaryllideae was a sister group to the rest of the family. The two other African tribes were Haemantheae and Cyrtantheae, and an Australasian tribe Calostemmateae was also identified, but a large clade could only be described as Eurasian and American, each of which were monophyletic sister clades to each other. The Eurasian clade was poorly resolved with the exception of Lycorideae. The American clade was better resolved identifying both Hippeastreae as a tribe. The American clade also included an Andean clade
Further investigation of the American clade suggested the presence of two groups, the Andean clade and a further "Hippeastroid" clade, in which Griffineae was sister to the rest of the clade. Similarly within the Andean clade four subclades were identified, including Eustephieae which appeared as sister to the remaining clade, including Hymenocallideae. Of the remaining taxa, two subclades emerged that did not correspond to existing tribal structure, namely Eucharideae and Stenomesseae. Rather the taxa segregated on a morphological criterion, namely leaf shape. Stenomesseae was recognised as polyphyletic with two distinct types based on leaf shape, while Eucharideae was petiolate, together with three Stenomesseae genera and a number of species of the type genus Stenomesson. Furthermore, the type species of Stenomesson, Stenomesson flavum is petiolate. The consequent petiolate Eucharideae/Stenomesseae subclade could not be further resolved into distinct monophyletic tribes. Subsequent treatment has been variable. Meerow et al. state here that this subclade should be called Stenomesseae because the type species of Stenomesson was petiolate and thus transferred from the former Stenomesseae into the new petiolate clade. Subsequently, Meerow treated the Andean clade as having four tribes with Eucharis in Stenomesseae.
However, since then the term Eucharideae has been used instead. For example, in a paper presented at Monocot IV, a cladogram published in 2013, and in 2014 only Eucharideae is mentioned while in 2015 Meerow described new species of Stenomesson and Eucharis as being in Eucharideae. The combined clade would include Stenomessaea as the reduced Stenomesson, Rauhia, Phaedranassa, and Eucrosia, together with Eucharideae as Eucharis, Caliphruria, and Urceolina.
Based on the oldest published name for the remaining lorate Stenomesson species, which is Clinanthus, the lorate subclade was designated tribe Clinantheae, and the remaining species transferred. In this redescription, Clinanthus luteus becomes the type species for tribe Clinantheae which includes Pamianthe, Paramongaia and Pucara. Although subsequent analysis resulted in submerging Pucara into Stenomesson, rather than treating it as a separate genus.
The Eurasian clade was also further resolved into four tribes, Pancratieae, Narcisseae, Galantheae and Lycorideae. This positioned Lycorideae as sister to the remaining Mediterranean tribes.
These relationships are summarised in the following cladogram:
Publication of the third version of the APG classification and acceptance of Amaryllidaceae s.l. was accompanied by a listing of accepted subfamily and tribal names, since the change in rank from family to subfamily necessitated a revision of other lower ranks, as follows:
Family: Amaryllidaceae J.St.-Hil., Expos. Fam. Nat. 1: 134. Feb–Apr 1805, nom. cons.
This circumscription differs from the phylogenetic descriptions of Meerow and colleagues in several respects, as described above. Griffineae is recognised as a distinct tribe within the Hippeastroid clade, and Stenomesseae is recognised as polyphyletic with two distinct types based on leaf shape and subsequent creation of Clinanthieae as a separate grouping, the remainder being submerged into Eucharideae.
Additional tribes:
The subfamily includes about 70 genera arranged in tribes and subtribes.

Books

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