Thursday, August 2, 2018

[Botany • 2018] Lysionotus bijantiae (Gesneriaceae) • A New Species of Lysionotus from Northeastern India

Lysionotus bijantiae D. Borah & A. Joe

in Borah & Joe, 2018. 

Lysionotus bijantiae, a new species of Lysionotus is described from Potin, Lower Subansiri District, Arunachal Pradesh, northeastern India. Detailed description, distribution along with color photographs are provided. A comparison chart of related species and a key to the taxa found in northeastern India are also provided.

Keyword: Arunachal Pradesh, Gesneriaceae, India, Lysionotus bijantiae, New species

Fig. 1. Lysionotus bijantiae:
A: Habitat. B: Habit. C: Flowering stem. D: Flowers. E: Bract. F: Calyx. G: Cut corolla inner surface with stamens and staminodes. H: Cut corolla outer surface. I: Stamens and staminodes. J: Stigma, style and a portion of ovary. K: Immature infructescence with persistent calyx.

Lysionotus bijantiae D. Borah & A. Joe, sp. nov. 

Lysionotus bijantiae is morphologically similar to L. gamosepalus but can be easily distinguished by a combination of characters such as erect sub-shrub (vs decumbent sub-shrub), stems pubescent (vs glabrous), leaves pubescent (vs glabrous), peduncles and petioles pubescent (vs glabrous), bracts lanceolate, villous (vs broadly ovate to orbicular, green, glabrous), calyx hairy, (vs glabrous), corolla cream (vs purplish), filaments curved (vs coiled), without connective appendage (vs horn-like connective appendage), pistil cream, pubescent (vs green, glabrous).

Etymology: The species is named after Bijanti Borah, mother of first author for her constant support. 

Distribution and ecology: Lysionotus bijantiae is known only from the type locality. The plant was found growing in wet shady areas. According to the IUCN red list categories and criteria (IUCN, 2012), L. bijantiae should be assessed as Critically Endangered (CR) based on the present situation: restricted geographic range of less than 2 km2 with only one single location (CR:B2a) and an estimated number of mature individuals of about 100.

Dipankar Borah and Alfred Joe. 2018. A New Species of Lysionotus (Gesneriaceae) from Northeastern India.  Taiwania. 63(3); 232-234. DOI: 10.6165/tai.2018.63.232