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 porrect-stellate 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.
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