Trichome complement of Turnera and Piriqueta (Turneraceae)

Abstract

The indumentum of Piriqueta and Turnera is made up of nine different types of trichomes, which broadly can be divided into glandular and non-glandular. Taking into account foot shape, head size and pedicle size, five variants of glandular trichomes are recognized: microcrapitate, stipitate-capitate, sessile-capitate and setiform. The non-glandular trichomes can be simple (unicellular or pluricellular-uniseriate), stellate or porrect-stellate. The setiform glandular hairs are present in most species of Piriqueta . Simple unicellular hairs are the most widespread type, frequently being found in combination with other trichomes. Stellate trichomes show a restricted distribution in both genera. Within Piriqueta , section Africana has only simple trichomes, whereas section Piriqueta has also porrectstellate trichomes; groups of species can be set up according to the presence and type of glandular trichomes. Within Turnera the stipitate-capitate trichomes are exclusive to series Papilliferae ; sessile-capitate trichomes are found in series Microphyllae , Annulares and in some species of Salicifoliae ; clavate trichomes are found only in series Turnera ; setiform glandular hairs are exclusive to T. collotricha , whereas the microcapitate trichomes are widely distributed.

Phylogeny of the Turneraceae clade (Passifloraceae s.l.): Trans–Atlantic disjunctions and two new genera in Africa

“…Arbo pointed again to the practically free sepals and indumentum of simple hairs of P. capensis, and added the presence of foliar nectaries in P. capensis as a further difference from the American species. The deviating indumentum of P. capensis compared to that of the other species of Piriqueta was stressed also by Gonzalez & Arbo (2004).…”

A preliminary leaf epidermal and pollen morphology of some West African species of <i>Desplatsia</i> Bocq

“…D. subericarpa had the lowest number of stomata. Trichomes have been most employed taxonomically to compare species within a genus (Gonzales & Arbo 2004;Sonibare & Shokefun 2005;Zarre 2003). In this study, two-celled head glandular trichomes are peculiar to species in the genus.…”

Turneraceae (Passifloraceae s.l.) na Região Sul do Brasil

“…As exsicatas foram analisadas através de microscópio estereoscópico e as medidas foram obtidas com a utilização de um paquímetro digital. A terminologia adotada neste trabalho seguiu Stearn (1983), Beentje (2010) e Gonçalves & Lorenzi (2011) para forma, base, ápice e margem das folhas, González & Arbo (2004) e Beentje (2010) para indumento, González (1998González ( , 2001) e González & Ocantos (2006) para a classificação dos coléteres e dos nectários, respectivamente, González (2010) para descrever os frutos, Arbo (1997Arbo ( , 2000Arbo ( , 2005Arbo ( , 2008a e González & Arbo (2013) para as sementes, e Beentje (2010) para os demais conceitos e para a definição das cores. Os dados referentes ao hábitat, à distribuição geográfica e aos períodos de floração e frutificação dos táxons provêm das informações contidas nas etiquetas das exsicatas dos herbários, das observações realizadas no campo e de consulta à bibliografia.…”