Annales Botanici Fennici
Research on plants and fungi since 1964.

Annales Botanici Fennici volume 63 (2026)

Chen W.-H., Lin Q., Li G.-Y., Zhang J.-G. & Shui Y.-M. 2026: Illicium nymphiiflorum (Schisandraceae), a new cauliflorous species from Yunnan, China. — Ann. Bot. Fennici 63: 43–47. | EPUB

Abstract Illicium nymphiiflorum Q. Lin & Y.M. Shui sp. nova (Schisandraceae) is described from China. It especially resembles I. viridiflorum from South Vietnam in being cauliflorous and in having similar greenish-white flowers and single-seriate stamens. It differs, e.g., in leaf shape (obovate vs. elliptic), apex of the innermost petals (acute vs. obtuse), arrangement of stamens (vertical vs. horizontal) and number of follicles (12–14 vs. 4–8). It also resembles I. stapfii, from which it differs in several floral characters. According to IUCN categories and criteria, I. nymphiiflorum is assessed as Critically Endangered (CR).

Santoso H., Putra F.R. & Felayati T. 2026: Sida conduplicata (Malvaceae), a new species from Java, Indonesia. — Ann. Bot. Fennici 63: 37–41. | EPUB

Abstract Sida conduplicata H.Sant. & Felayati (Malvaceae) is described as a new species from East Java, Indonesia. It is similar to S. rhombifolia var. maderensis in having a single awn on the mericarp, but differs from it by a set of diagnostic morphological characters such as habit, leaf apex and surface of the mericarp. We provide an identification key to the species of Sida known from Java.

Viciani D., Viviani I. & Lastrucci L. 2026: Typification of six names published by Stéphen Sommier from Siberia. — Ann. Bot. Fennici 63: 27–36. | EPUB

Abstract We propose the typification of six names validly published by Stéphen Sommier and based on specimens collected during his trip to Siberia along the Ob River in 1880. The names are Polygonum aviculare var. rostratum Sommier, Pyrola rotundifolia var. marginata Sommier, Stachys palustris var. macrantha Sommier, Stellaria graminea f. diffusa Sommier, Thalictrum flavum var. laxum Sommier and Thalictrum polygynum Sommier. The proposed lectotypes are deposited at FI.

Parthiban A., Rasingam L., Sandhya Deepika D. & Bharathan H.P. 2026: Two new heterotypic synonyms in Rotala (Lythraceae) from India. — Ann. Bot. Fennici 63: 17–25. | EPUB

Abstract Based on morphology, we synonymise Rotala baileyana with R. tulunadensis and R. cheruchakkiensis with R. malampuzhensis. Updated morphological descriptions, photographs and notes on conservation status and phenology, as well as habitat and distribution of the accepted species are provided. A broader range of morphological variation within these species is documented.

Revathy V. & Robi A.J. 2026: Two new species of Litsea (Lauraceae) from the southern Western Ghats of Kerala, India. — Ann. Bot. Fennici 63: 9–16. | EPUB

Abstract Litsea meesapulimalaiana Revathy V. & Robi, and L. idukkiana Robi & Revathy V. (Lauraceae) are described and illustrated as new species from Kerala, India. They morphologically resemble L. gorayana and L. ligustrina, respectively, but there are consistent differences. Detailed descriptions, data on distribution and phenology, illustrations and colour photographs are provided to facilitate identification of the new species, along with a comparison with L. gorayana and L. ligustrina.

Parthiban A., Rasingam L. & Sandhya Deepika D. 2026: Justicia balakrishnaniana (Acanthaceae), a new species from Andaman and Nicobar Islands, India. — Ann. Bot. Fennici 63: 5–8. | EPUB

Abstract Justicia balakrishnaniana Parthiban, Rasingam & D. Sandhya Deepika (Acanthaceae) is described and illustrated as a new species from the Andaman and Nicobar Islands, India. It is morphologically allied to J. ekakusuma due to similarities in the inflorescence and bracteoles, but differs in its decumbent growth habit, stems that root at the lower nodes, 5-lobed calyx, fruits lacking a constriction at the middle and wingless seeds. An identification key to the species of Justicia in the Andaman and Nicobar Islands is provided.

Manikkara R. & Kaliyamurthy K. 2026: Lectotypification and correct authorship of the name Viscum ramosissimum (Santalaceae, tribe Visceae). — Ann. Bot. Fennici 63: 1–4. | EPUB

Abstract This paper addresses a long-standing nomenclatural confusion concerning the authorship of the name Viscum ramosissimum. Through a detailed review of its protologue, author citations and original materials, we conclude that it should be V. ramosissimum Wall. ex Wight & Arn. We also lectotypify the name in accordance with the International Code of Nomenclature for algae, fungi and plants.