Armen Takhtajan

The ferns (Polypodiopsida or Polypodiophyta) are a group of vascular plants (land plants with vascular tissues such as xylem and phloem) that reproduce via spores and have neither seeds nor flowers. They differ from non-vascular plants (mosses, hornworts and liverworts) by having specialized transport bundles that conduct water and nutrients from and to the roots, as well as life cycles in which the branched sporophyte is the dominant phase. Ferns have complex leaves called megaphylls that are more complex than the microphylls of clubmosses. Most ferns are leptosporangiate ferns that produce

Tofieldiaceae is a family of flowering plants in the monocot order Alismatales. The family is divided into four genera, which together comprise 28 known species (Christenhusz & Byng 2016 ). They are small, herbaceous plants, mostly of arctic and subarctic regions, but a few extend further south, and one genus is endemic to northern South America and Florida. Tofieldia pusilla is sometimes grown as an ornamental. William Hudson (1730-1793) named Tofieldia for the British botanist Thomas Tofield (1730–1779). The family Tofieldiaceae was erected by Armen Takhtajan in 1995. Molecular phylogenetic

Argophyllaceae is a family of shrubs or small trees belonging to the order Asterales. The family includes c. 24 species in two genera, Argophyllum and Corokia. Members of the family are native to eastern Australia, New Zealand, Lord Howe Island, New Caledonia, and Rapa Iti.

Berberidopsidaceae is a family of flowering plants. Such a family has only recently been recognized by more than a few taxonomists: the plants involved have often been treated as belonging to family Flacourtiaceae. The APG II system, of 2003 (unchanged from the APG system, of 1998), does recognize this family, unplaced as to order and merely assigned to the clade core eudicots. The family consists of one or two genera, Berberidopsis, with two species (B. beckleri and B. corallina) and Streptothamnus, with a single species (S. moorei). However, APG II mentions the possibility of recognizing an

The family Apodanthaceae comprises about 10 species of endoparasitic herbs. They live in the branches or stems of their hosts (as filaments similar to a fungal mycelium), emerging only to flower and fruit. The plants produce no green parts and do not carry out any photosynthesis (that is, they are holoparasitic). There are two genera: Pilostyles and Apodanthes. A third genus, Berlinianche, was never validly published. The native range of Apodanthes is restricted to Central and tropical South America, while Pilostyles has a much wider though disjointed native range, encompassing many countries

Tapisciaceae is a family of flowering plants. Until recently it had been abandoned by taxonomists, and it was not recognised in the APG II system of 2003. In the APG III system, however, it has been reinstated to encompass the two genera Tapiscia and Huertea, with a total of six known species.

Kirkiaceae is a family of flowering plants in the order Sapindales. It comprises one (or two) genera, Kirkia (and Pleiokirkia now included in Kirkia), totalling six species. These two genera were previously placed in family Simaroubaceae, but were transferred into their own family because they produce neither quassinoids nor limonoids. Kirkia is named for Captain John Kirk (explorer) of the famous Zambesi Expedition. They occur along the east coast of Africa, and in Madagascar.

In plant taxonomy, commelinids (originally commelinoids) is a clade of flowering plants within the monocots, distinguished by having cell walls containing ferulic acid. Well-known commelinids include palms and relatives (order Arecales), dayflowers, spiderworts, kangaroo paws, and water hyacinth (order Commelinales), grasses, bromeliads, pineapples, rushes, and sedges (order Poales), ginger, cardamom, turmeric, galangal, bananas, plantains, and bird of paradise flower (order Zingiberales). The commelinids are the only clade that the APG IV system has informally named within the monocots. The

The Polypodiidae, commonly called leptosporangiate ferns, formerly Leptosporangiatae, are one of four subclasses of ferns, the largest of these being the largest group of living ferns, including some 11,000 species worldwide. The group has also been treated as the class Pteridopsida or Polypodiopsida, although other classifications assign them a different rank. Older names for the group include Filicidae and Filicales, although at least the "water ferns" (now the Salviniales) were then treated separately. The leptosporangiate ferns are one of the four major groups of ferns, with the other

Physena is the sole genus of the flowering plant family Physenaceae. It contains two species of shrubs and small trees which are endemic to Madagascar. The APG II system, of 2003 (unchanged from the APG system, of 1998), does recognize this family and assigns it to the order Caryophyllales in the clade core eudicots.

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Petrosaviaceae is a family of flowering plants belonging to a monotypic order, Petrosaviales. Petrosaviales are monocots, and are grouped within the lilioid monocots. Petrosaviales is a very small order composed of one family, two genera and four species accepted in 2016. Some species are photosynthetic (Japonolirion) and others are rare, leafless, chlorophyllous, mycoheterotrophic plants (Petrosavia). The family is found in low-light montane rainforests in Japan, China, Southeast Asia and Borneo. They are characterised by having bracteate racemes, pedicellate flowers, six persistent tepals,

Epigaea gaultherioides is a species of flowering plant in the Ericaceae family. It is native to Transcaucasia and Turkey.

Hypericum formosissimum is a species of flowering plant in the St John's wort family Hypericaceae. Found in the cracks of limestone rocks, it is a small perennial herb that grows in a pillow-like shape, has yellow flower petals, and blooms in the late summer. The plant is rare and has a limited habitat in Turkey, Armenia, and Azerbaijan. It is threatened by rock collapses, urbanization, and road construction; it is not protected by conservation efforts. The species was first described as Hypericum formosum by Soviet-Armenian botanist Armen Takhtajan and was later excluded from a genus-wide

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Iris spuria subsp. musulmanica is a species of the genus Iris, part of a subgenus known as Limniris and in the series Spuriae. It is a subspecies of Iris spuria and is a rhizomatous perennial plant, from Armenia, Azerbaijan, Iran and Turkey in Asia with flowers in various shades of blue, but there are rare white forms. They have a yellow centre and darker veining. It has the common name of 'Muslim iris'. It is cultivated as an ornamental plant in temperate regions.

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Gymnospermium albertii (syn. Leontice alberti) is a species in the genus Gymnospermium in the family Berberidaceae.

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Pinidae is a subclass of Equisetopsida in the sense used by Mark W. Chase and James L. Reveal in their 2009 article "A phylogenetic classification of the land plants to accompany APG III." This subclass comprises the conifers. The Pinidae subclass is equivalent to the division Pinophyta and class Pinopsida of previous treatments. There are over 600 species of Pinidae all over the world.

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