A new species and a new record of Liparis sect. Decumbentes (Malaxidinae, Orchidaceae) from Peru

A new species of Liparis sect. Decumbentes, Liparis sessilis Damián, Salazar & Rimarachín, sp. nov is described and illustrated from Amazonas (Perú), including color photographs, a detailed comparison and an identification key to all the species of Liparis sect. Decumbentes. In addition, we report Liparis brachystalix Rchb.f. for the first time for the orchid flora of Peru, and select a lectotype for its synonym, L. commelinoides Schltr.

Nuevas adiciones a la flora del Perú, VIII

New additions to the flora of Peru, VIIIPalabras clave: Biogeografía, flora, páramo, Perú.Key words: Biogeography, flora, paramo, Peru.

An unusual new record of Baccharis (Asteraceae) from the Peruvian Andes and its relation with the northern limit of the dry puna

Background and Aims: The knowledge of the richness and distribution of the flora in the Peruvian Andes is scarce; about 70 taxonomic novelties have been reported for this area in the last decade, a large part belonging to the Asteraceae. The objective of this paper is to contribute to the knowledge of this flora through a new record of Baccharis acaulis. In addition, the distribution pattern of this species is examined.Methods: As part of floristic inventories in the high Andes of Peru, various field trips were carried out, several plant specimens were collected, among them a previously unreported species, which was identified by consulting some specialists and confirmed using taxonomic keys. Furthermore, predicting species distribution based on ecological niche modeling was made use the machine learning algorithm Maxent with the bioclimatic variables of the WorldClim database.Key results: A species of the genus Baccharis was registered for the first time for the flora of Peru. This species is recognized for its unique habit; it is a rhizomatous herb in which the aboveground part consists of small leaf rosettes surrounding a solitary capitulum. The species was collected in the south of the Peruvian Andes. This record extends the known distribution of the species considerably to the north.Conclusions: This record suggests the need to continue studying the Andean flora, as well as the links of their distribution patterns with the phytogeographical regions.

Spiny fruits revealed by nano-CT scanning: Pseudoanacardium peruvianum (Berry) gen. et comb. nov. from the early Oligocene Belén flora of Peru

Fossil fruits formerly described as cashews from the Oligocene of Peru are reinvestigated based on the original specimens and newly collected materials. The recovery of an outer spiny layer, preserved in the sedimentary molds surrounding the locule casts, indicates that these disseminules do not represent Anacardium. Imagery from nano-CT scans of the specimens documents a distinctive morphology which does not resemble any fruits or seeds of Anacardiaceae. We describe the morphology in more detail and reassign the fossils to an extinct genus, Pseudoanacardium gen. nov., of uncertain familial affinity. Pseudoanacardium peruvianum (Berry) comb. nov. was a prominent member of the Belén carpoflora, which also included palms plus Annonaceae, Euphorbiaceae, Humiriaceae, Leeaceae, Icacinaceae, Rutaceae and Vitaceae.

Gentianella canoi S.J.Castillo & J.S.Pringle sp. nov. (Gentianaceae), a new species from Peru

A new species of Gentianella (Gentianaceae) is described from the flora of Peru. Gentianella canoi S.J.Castillo & J.S.Pringle sp. nov., which inhabits high Andean rocky slopes of the Department of Ancash. This new species is related to G. gilgiana (Reimers) Fabris ex J.S.Pringle and G. tristicha (Gilg) J.S.Pringle, with which it shares a caespitose habit, numerous very narrow basal leaves, floriferous stems more than 20 cm high, and widely open corollas. It is differentiated from G. gilgiana mainly by its inflorescences, with 5–11 flowers —vs. 2 or 3—, and corollas 21–28 mm long —vs. 45–55 mm—; from G. tristicha in its opposite leaves —vs. verticillated—; and of both species in their pale yellow corollas —vs. red vermillion in G. gilgiana, lilac in G. tristicha— and in the absence of trichomes in the adaxial surface of the corolla.