Thymelaeaceae
The Thymelaeaceae are a cosmopolitan family of flowering plants composed of 50 genera and 898 species. It was established in 1789 by Antoine Laurent de Jussieu. The Thymelaeaceae are mostly trees and shrubs, with a few vines and herbaceous plants, the latter including some annual species.
Description
Several conspicuous or unusual traits are characteristic of the family. The bark is usually shiny and fibrous, with strips of bark peeling down the side of broken stems. The number of stamens is usually once or twice the number of calyx lobes; when twice, they often occur in two well separated series. Exceptions include Gonystylus, which may have up to 100 stamens, and Pimelea, which has only 1 or 2.Thymelaeaceae are often difficult to identify because of equivocal interpretation of the flower parts. Sepals, petals, and staminodes are hard to distinguish, and many keys are ambiguous about whether staminodes should be counted as stamens. Moreover, in Wikstroemia, individual plants often produce anomalous flowers.
Taxonomy
The family is named from the genus Thymelaea, the name of which is a combination of the Greek name for the herb thyme θύμος and that for the olive ἐλαία —in reference to its thyme-like foliage and olive-like fruit.Classification
The Thymelaeaceae are in the order Malvales. Except for a sister relationship with Tepuianthaceae, little is known for sure about their relationships with the other families in the order.Unlike most recent authors, who accept four subfamilies, B. E. Herber has divided Thymelaeaceae into two subfamilies. He has retained the subfamily Gonostyloideae, but renamed it Octolepidoideae. The other three traditional subfamilies were combined into a Thymelaeoideae s.l., and reduced to tribal rank, as Synandrodaphneae, Aquilarieae, and Daphneae, respectively. No tribes were designated in subfamily Octolepidoideae, but it was provisionally divided into two informal groups, the Octolepis group and the Gonystylus group. Likewise, no subtribes were designated in the tribe Daphneae, but it was informally divided into four groups: the Linostoma group, the Daphne group, the Phaleria group, and the Gnidia group. The 45 genera accepted by Herber are grouped as follows. Three genera in Daphneae were placed incertae sedis.
Phylogeny
The first molecular phylogeny for Thymelaeaceae was published in 2002. It was based on two regions of chloroplast DNA. These were the rbcL gene and the intergenic spacer between the transfer RNA genes trnL and trnF. Forty one species in the family were sampled. In 2008, Marline Rautenbach performed a phylogenetic study in which 143 species in the family were sampled. The sampling in this study was concentrated in the Gnidia group, but the sampling in the rest of the family was as extensive as in the previous study, or more so. In addition to rbcL and trnL-F data, sequences of the ITS region of nrDNA were used. All of the clades that were strongly supported in the previous study were recovered with even stronger statistical support.The tree below is an excerpt from the Rautenbach phylogeny. The species of Gnidia were chosen from among the most common or well known species in a way that shows which clades contain species of Gnidia.
Defining the genera
The circumscription of genera in Thymelaeaceae has always been difficult, and is to some degree artificial. For example, the difficulty of distinguishing Daphne from Wikstroemia has been commented upon by Rautenbach and Herber. Several small genera are probably embedded in Daphne or Wikstroemia, or if Daphne and Wikstroemia are intermingled, these small genera might be embedded in both simultaneously. Stellera, for example, is nested within Wikstroemia, at least.A recent comparison of DNA sequences has established the monophyly of Thymelaea and the polyphyly of Diarthron, but there was not sufficient sampling in Wikstroemia and Daphne to exclude the possibility that Thymelaea, Diarthron, and others might be embedded in them.
The large genus Gnidia is polyphyletic and its species fall into four separate clades, each of which contains other genera of the family. The type species for Gnidia is Gnidia pinifolia. If Gnidia is divided into four or more separate genera, the segregate genus which contains G. pinifolia will retain the name Gnidia. Zachary S. Rogers published a revision of the Gnidia of Madagascar in 2009 in Annals of the Missouri Botanical Garden.
Some of the older treatments of Thymelaeaceae treat Lasiosiphon as a separate genus from Gnidia. This distinction was later shown to be artificial. However, Van der Bank et al. suggested that Lasiosiphon might be resurrected if redefined. The type species for Lasiosiphon is Gnidia glauca, formerly known as Lasiosiphon glaucus.
Open questions
Rautenbach used different names from Herber for some of the groups and placed some of the groups at different taxonomic rank, but her phylogeny supports Herber's classification with the few exceptions noted below. The only strongly supported difference for a clade consisting of the Gnidia group with Stephanodaphne and Peddiea. Again, more extensive sampling will be required to resolve this question. Two of the three genera placed incertae sedis by Herber have not yet been sampled and their relationships to other genera remain obscure.Genera
Herber accepts 45 genera, excluding Tepuianthus from the family, sinking Atemnosiphon and Englerodaphne into Gnidia, Eriosolena into Daphne, and Thecanthes into Pimelea. The largest genera and the approximate number of species in each are Gnidia, Pimelea, Daphne, Wikstroemia, Daphnopsis, Struthiola, Lachnaea, Thymelaea, Phaleria, and Gonystylus., Plants of [the World Online] accepts 52 genera.
In the past, different authors have defined Thymelaeaceae in different ways. For example, John Hutchinson excluded Gonystylus and its close relatives, as well as Aquilaria and its close relatives from the family, forming two segregate families, Gonystylaceae and Aquilariaceae. But today, the only controversy that still remains over the circumscription of the family is the question of whether Tepuianthus should be included, or segregated as a separate, monogeneric family. Stevens includes Tepuianthus, but Kubitzki treats Tepuianthaceae as a separate family.