Imhof, S., Weber, H. Chr. & Gómez, L. D. (1994):

Ein Beitrag zur Biologie von Voyria tenella Hook. und Voyria truncata (Standley) Standley & Steyermark (Gentianaceae)

Beitr. Biol. Pflanzen 68: 113 - 123.

Abstract:

The chlorophyll lacking Gentianaceae Voyria tenella Hook. and Voyria truncata (Standley) Standley & Steyermark have been observed within their natural habitat, and new results concerning ontogeny and ecology were revealed.

V. tenella is annual. The earliest stage of development found, is a structure of only 2 mm in length and apparently constitutes root material. Proceeding from this stage, a morning star type of root-system is developed. Subsequently, 3 to 4 stems are brought out successively. Within a week, the primarily nodding buds come to flower; anthesis lasts only for some days. After 2 months approximately, the life cycle of an individual is accomplished.

In contrast, the roots of V. truncata are relatively strong, numerous and grow more or less horizontale down to 20 cm under the soil surface. Lateral roots up to the 3rd order could be ascertained. Stems are exclusively root-borne and can be branched subterraneously already. Rhizomes do not occur.

Both species are probably ant-dispersed. The developmental abbreviations of the subterranean organs are discussed with respect to phylogenetic tendencies.

Keywords: Voyria, Gentianaceae, subterranean organs, morphology, ecology.