Dorstenia triseriata
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Machado2014PhytoKeys38, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Machado2014PhytoKeys38">{{Citation See also the citation download page at the journal. |
Ordo: Rosales
Familia: Moraceae
Genus: Dorstenia
Name
Dorstenia triseriata A.F.P.Machado, Fontella & Carauta sp. nov. – Wikispecies link – IPNI link – Pensoft Profile
Type
Brazil. Espírito Santo: Município de Santa Teresa, Parque Natural Municipal São Lourenço, 19°56'09"S, 40°36'00"W. 28 oct 2008. TT Carrijo 1508 & AFP Machado (holotype: R!) Fig. 1A–F; 2A–C. Dorsteniae turnerifoliae similis, sed pedunculo elongato (in vicem brevi), receptaculo rotundato cum una serie bracteis submarginalibus viridibus etiam duabus seriebus bracteis marginalibus violaceis (nec tantum una serie bracteis) et fimbria non distincta (in vicem fimbria distincta) differt.
Herb to subshrub up to 40 cm tall; rhizome short; stem 3–5 mm thick, hirtellous with straight and uncinate hairs, internodes up to 1(-2.0) cm long. Leaves spiraled, lamina oblong to lanceolate, or subovate to subobovate, 3–7(-9) × 1.5(-2.5) cm long, chartaceous, apex acute, base rounded, margin dentate; indumentum rough on both surfaces, of uncinate hairs, plus simple and elongated hairs on veins, lateral veins 5–8 pairs, prominent on the abaxial surface, tertiary venation reticulate; petiole 1–2 cm long, pilose; stipules persistent, subulate, 1–2 mm long, coriaceous, deflexed. Inflorescences greenish, margin purplish; peduncle 1.0–3.5 cm long, pubescent with simple and elongated hairs; receptacle circular, 0.3–0.8 cm in diameter, margin dentate, fringe not distinct; submarginal bracts green in 1 row, ovate, up to 0.5 mm long; marginal bracts purplish in 2 rows; staminate flowers at the periphery of inflorescence, tepals 3, stamens 2, filaments as long as the perianth; pistillate flowers sessile, tepals 2–3, ovary free, stigmas 2 subequal in length; fruit a dehiscent drupe rough, 2 mm.
Etymology
The specific epithet is an allusion to number of marginal bracts rows, arranged in three vertical rows.
Distribution and habitat
Dorstenia triseriata inhabits the states of Espírito Santo, Bahia, and Minas Gerais in Brazil.
Observations
Dorstenia triseriata is closely related to two other species: Dorstenia romaniucii A.F.P.Machado & M.D.M. Vianna and Dorstenia turnerifolia Fisch. & C.A. Mey. From Dorstenia romaniucii both other species are differentiated by the staminate flowers disposed peripherally at the inflorescence. Dorstenia triseriata is distinguished from Dorstenia turnerifolia by its elongated peduncle (vs. short), purplish and circular receptacles (vs. green and angular receptacles), fringe not distinct (vs. fringe distinct) and marginal bracts in three rows 1 green and 2 purplish (vs. 1 row). submarginal bracts green in 1 row, ovate, up to 0.5 mm long; marginal bracts purplish in 2 rows
The circumscription of Dorstenia turnerifolia adopted by Berg and Hijman (1999)[1] and Berg (2001)[2] is too broad and covers many taxa. However, the analysis of classical collections, original description, and the plant material collected by the first author at the type locality allows the recircumscription of Dorstenia turnerifolia (Fig. 2D, E, F and Table 1) and allows us to recognize Dorstenia triseriata as a new species.
| Characters | Leaf blade (cm long) | Lateral veins | Peduncle (cm) | Receptacle | Marginal bracts (rows) | Fringe |
|---|---|---|---|---|---|---|
| Taxa | ||||||
| Dorstenia triseriata | 3–7(–9) | 5–8 pairs | 1.5–3.0 | Rounded (0.3–0.8) | 3 (1 green + 2 purple) | Not distinct |
| Dorstenia romaniucii | 2–13(–17) | 14–16 pairs | 1–1.5 | slightly angular (1–1.3) | 2 (green) | Not distinct |
| Dorstenia turnerifolia | 5–7(–17) | (7–)10–17 pairs | 0.5–1.0 | Orbicular to rounded (1–2) | 1 (green) | Distinct |
Conservation status
According to IUCN (2001)[3] criteria, this species is considered Vulnerable (VU B2a; B2bi, ii, iii). Area of occupancy estimated to be less than 2000 Km² with a decrease in area of occupancy, extension of occurrence, and habitat quality.
Additional specimens examined
Brazil. Espírito Santo. Santa Teresa, 28 May 2008, Machado 937 (R); l.c., Santa Teresa, Parque Natural Municipal São Lourenço, 29 Mar. 2007, Monteiro et al. 368 (R); l.c., Santa Teresa, Parque Natural Municipal São Lourenço, Machado 936, l.c., Santa Teresa, Carrijo, 1507. May 2008 (R). Bahia. Itanhaém, 17°8'17"S, 40°25'34"W. 29 Dec 2004, Amorim et al., 4629 (HUEFS). Minas Gerais. Itabira, Fazenda do Quilombo, 19°37'10"S, 43°13'36"W. 27 Jan. 1943, Magalhães s.n. (HUEFS 118735)
Original Description
- Machado, A; Pereira, J; Carauta, J; 2014: Dorstenia triseriata (Moraceae) a new and endangered species from Brazil PhytoKeys, 38: 31-35. doi
Other References
- ↑ Berg C, Hijman M (1999) The genus Dorstenia (Moraceae). Ilicifolia 2: 1−211.
- ↑ Berg C (2001) Moreae, Artocarpeae and Dorstenia (Moraceae): with introductions to the family and Ficus and with additions and corrections to Flora Neotropica 7, Mon. 83. New York Botanical Garden, New York, 1−346.
- ↑ IUCN (2001) IUCN Red List Categories and Criteria, Version 3.1. www.iucn.org
Images
|
