Evolutionary relationships and taxonomy of Microtea (Microteaceae), a basal lineage in the core Caryophyllales Author Sukhorukov, Alexander P. Author Sennikov, Alexander N. Author Nilova, Maya V. Author Mazei, Yuri Author Kushunina, Maria Author Marchioretto, Maria Salete Author Hanacek, Pavel text PhytoKeys 2019 115 1 50 http://dx.doi.org/10.3897/phytokeys.115.29041 journal article http://dx.doi.org/10.3897/phytokeys.115.29041 1314-2003-115-1 FFC7960EFFAAFFDC04270C4DBF41FFA8 2542375 Gen. Microtea Sw., Prodr. [O.P.Swartz]: 53 (1788). Microtea debilis Sw. (type species) Schollera Rohr, Skr. Naturhist.-Selsk. 2: 210 (1792), nom. illegit., non Roth (1788). Microtea subgen. Schollera (Rohr) H.Walter, Pflanzenr. (Engler) 39: 127 (1909), nom. inval. (Art. 22.2). Type species: M. debilis Sw. Note: Vahl (1792) established that a new generic name, Schollera was based on the plant that he considered conspecific with Microtea debilis . The type of Schollera Rohr is therefore that of Microtea debilis ( Turland et al. 2018 : Art. 10.2). Ancistrocarpus Kunth, Nov. Gen. Sp. [quarto] 2: 186 (1817). Type species: A. maypurensis Kunth (≡ Microtea maypurensis (Kunth) G.Don). Potamophila Schrank, Pl. Rar. Hort. Monac. 2: tab. 63 (1821) nom. illegit., non R.Br. (1810). Type species: P. parviflora Schrank (= Microtea maypurensis (Kunth) G.Don). Ceratococca Willd. ex Roem. & Schult., Syst. Veg., ed. 15, 6: LXX (1820). Type species: C. maypurensis Humb. & Bonpl. ex Roem. & Schult. (= Microtea maypurensis (Kunth) G.Don). Aphananthe Link, Enum. Hort. Berol. Alt. 1: 383 (1821), nom. rej. Type species: A. celosioides (Spreng.) Link (≡ Microtea celosioides (Spreng.) Moq. ex Sennikov & Sukhor.). Note: The generic name Aphananthe Link is rejected in favour of its later homonym, Aphananthe Planch. ( Cannabaceae ). Description of the genus. Annuals, perennial herbs, rarely dwarf subshrubs; stems angulate, glabrous or papillate; leaves alternate, sessile or pedunculate, entire, filiform to ovate or obovate, cuneate or truncate, apically mostly acuminate, a persistent leaf rosette usually present, cauline leaves resembling the rosulate leaves or much shorter; inflorescence a spike or thyrsoid; pedicel inconspicuous or up to 3 mm long; flowers actinomorphic, bisexual, subtended by a hyaline bract and two similar bracteoles, sometimes bracteoles absent; perianth of (4)5 glabrous segments or lobes, green, white or yellowish; stamens (4)5 in alternisepalous position, or 6-8 (in both antesepalous and alternisepalous positions), anthers 0.15-0.30 mm, introrse, thecae globose, pollen grains pantoporate; ovary roundish; style not present or very short, stigmas 2-5; fruit nut-like, single-seeded, dry; pericarp projections (if present) not evident in flowering condition, pericarp at fruiting stage reticulate, mostly having finger-shaped outgrowths (emergences) that can be plumose (with additional smaller hair-like projections) or hooked at their apices; seeds spherical, black, with rugose or alveolate surface, with annular embryo located vertically and abundant perisperm. Ten species distributed in the (sub)tropics of the Americas; two - M. debilis and M. maypurensis - are considered as aliens in the humid tropics of Africa (Cameroon) and Asia (Indonesia), respectively.