Monographs Details: Sohnreyia
Authority: Stern, William L. & Brizicky, George K. 1960. The morphology and relationships of Diomma, gen. inc. sed. Mem. New York Bot. Gard. 10: 38-57.
Scientific Name:Sohnreyia

The genus Sohnreyia is represented by a single species, S. excelsa, which was described by Krause (1914) from specimens gathered by Ule. Sohnreym like Diomma, is one of those dicotyledons with a palm-like habit. Krause describes this plant as an erect, palm-like tree with a slender unbranched trunk bearing very large pinnate leaves crowded at the apex. Also, like Diomma, Sohnreyia is a species which blooms and fruits but once at the termination of its existence (Krause 1921; Ducke 1930).

Krause (1914) notes that the large, pinnately compound leaves of Sohnreyia are glandular-punctate. Flowers are white, regular, polygamous, 5-merous, and disposed in loose, many-flowered panicles. The free stamens are inserted at the base of a gynophore opposite the sepals. In the female and bisexual flowers, stamens are smaller than in the male flowers. The filaments are provided with a wing-like, bifid appendage in the lower part. The 2-locular ovary is inserted on a thick, subcylindrical gynophore. Ovaries are small, rudimentary, and estigmatose in male flowers, but in female and bisexual flowers the ovaries are larger, somewhat laterally compressed, and in females bear a short style terminated by a fairly large, bilobed, discoid stigma. Ovules are pendulous, anatropons, and solitary in each locule of the ovary. Krause did not see fully developed fruits. However, in 1922, Ducke described the fruits of Sohnreyia as resembling the samaras of certain Combretacrae, e.g., Terminalia argentea. However, he noted that the fruits of Sohnreyia were 2-secded, dry, and with 2 membranous confluent wings which are conspicuously reticulate. According to Ducke and Black (1953), Sohnreyia e.reeha is scattered in Brazil on uplands from Manaus to the lower part of the Trombetas River north of the Amazon River, and south of the Amazon River from Juruti Velho and Maues to the northern part of the Mato Grosso and the Territory of Guapore.

Krause (1914) placed Sohnreyia in the Rutaccac, in an isolated position, mentioning- that it could be related to Dictyoloma, but lacking mature fruits no definite association could be made. Bngler (1931) agreed with Krause regarding the definitely rutaceous nature of Sohnreyia. and erected a special monotypic subtribe Sohnrcyiinac under the tribe Toddalieae of the subfamily ToddaJioidcae to contain this genus.