Oxalis section Alpinae (Oxalidaceae): orbicules diversity and pollen grain morphology

LOPEZ, ALICIA; ROSENFELDT, SONIA

TURKISH JOURNAL OF BOTANY

TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY

Año: 2016 vol. 40 p. 637 - 644

1300-008X

Orbicules characteristics and pollen morphology were studied using light microscopy LM) and scanning electron microscopy (SEM) within thirteen species of Oxalis section Alpinae, endemic to South America. Orbicules are either homogeneous or heterogeneous in size; surface smooth or with punctuations; margin smooth, lobed or wavy; rounded, oblong, or irregular shapes; variable clustering. According to orbicules characteristics, six groups are proposed. Oxalis pollen grain is 3-colpate and the shape is prolate spheroidal, oblate spheroidal or spheroidal; ambit rounded or triangular. Exine microreticulate, semitectate, brochate. Brochi circular, oval, triangular to polygonal. Lumen with or without content. Sporopollenin generally forming groups that may be in rows in the margins or in the center of colpus.