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Two new species of Gentianella (Gentianaceae) from Peru

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Abstract

Two new species of Gentianella (Gentianaceae, Gentianeae, Swertiinae), G. grantii and G. wayqecha, are described from Departamento Cusco, Peru. These two species differ from other Peruvian species of Gentianella in a combination of stems 10–100 cm long; no rosette of basal leaves; cauline leaves 10–75 mm long; flowers in thyrses; and corollas 14–26 mm long, campanulate, and adaxially glabrous. The leaves of G. grantii consist of an appressed pseudopetiole and a spreading, narrowly elliptic-oblong to linear blade; the corollas are lavender; and the corolla lobes are 0.6–0.7× as long as the tube. Gentianella grantii is similar to G. lythroides, of Bolivia, but differs in having more closely spaced leaves and less deeply lobed corollas. The leaves of G. wayqecha are sessile, lanceolate to ovate; the corollas are rose-violet; and the corolla lobes are 0.75–1.35× as long as the tube. Gentianella wayqecha is similar to G. rapunculoides, of Colombia and Ecuador, and G. ruizii, of Peru, but differs from both in its adaxially glabrous corollas and from G. rapunculoides in its less deeply lobed corollas. Both G. grantii and G. wayqecha grow in moist habitats near tree line, and are known only from a area northeast of the city of Cusco.

Resumen

Se describen dos nuevas especies de Gentianella (Gentianaceae, Gentianeae, Swertiinae), G. grantii y G. wayqecha, del Departamento Cusco, Perú. Los dos se diferencian de las otras especies peruanas de Gentianella por la combinación de los tallos de 10–100 cm de largo; la roseta de las hojas basales ausente; las hojas del tallo de 10–75 mm de largo; las flores agrupadas en tirsos; y las corolas de 14–26 mm de largo, acampanadas, y dentro glabras. Las hojas de G. grantii consisten en el pseudopecíolo adpreso y la lámina desplegada, angostamente elliptico-oblonga; las corolas son lavandas; y los los lóbulos de la corola son de largo 0.6–0.7× que del tubo. Gentianella grantii se parece a G. lythroides, de Bolivia, pero se diferencia por las hojas espaciadas más densamente y las corolas lobuladas menos profundamente. Las hojas de G. wayqecha son sesiles, lanceoladas a ovadas; las corolas son roseovioladas, y los lóbulos de la corola son de largo 0.6–0.7× que del tubo. Gentianella wayqecha se parece a G. rapunculoides, de Colombia y Ecuador, y G. ruizii, del Perú, pero se diferencia de las dos por la corola dentro glabra y de G. rapunculoides por las corolas lobuladas menos profundamente. Las dos G. grantii y G. wayqecha crecen en hábitats húmedos cerca del nivel de árboles, y se conocen solamente de la región al noroeste de la ciudad Cusco.

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Acknowledgments

We are grateful for the opportunity to study specimens in the herbaria of the Field Museum of Natural History, Harvard University, the Missouri Botanical Garden, and the New York Botanical Garden and literature in the Missouri Botanical Garden library. We are also grateful to Dr. Norma Salinas Revilla for assistance to the second author in procuring plant collection permits and logistical support in Cusco and at the Wayqecha Biological Station. Bobbi Angell prepared the stylish and intricately detailed scientific illustrations. This is Contribution No. 196 from the Royal Botanical Gardens, Hamilton, Ontario, Canada.

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Correspondence to James S. Pringle.

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Pringle, J.S., Grant, J.R. Two new species of Gentianella (Gentianaceae) from Peru. Brittonia 64, 282–288 (2012). https://doi.org/10.1007/s12228-012-9239-z

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