Neviusia
| Neviusia | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Neviusia alabamensis |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Neviusia | ||||||||||||
| A.Gray |
The neviusia are a plant kind from the family of the rose family (Rosaceae).
description
Neviusia are unpringed, deciduous shrubs . Their leaves are simple, the non-grown stipules are small.
The inflorescence is a short, terminal cluster , the hermaphroditic, five-fold, attractive flowers stand on long pedicels , petals are missing or are greatly reduced, the sepals lie on top of each other in scales, are long and leaf-like, green to greenish-white and incised on the edge, an outer calyx is missing. The flower cup is saucer-shaped to cup-shaped.
The numerous stamens are white. A discus cannot be seen. There are two to five ungrown pistils . The scars are linear and attached to one side of the terminal stylodium . There is only one ovule , the fruit is an achenes with a thin, fleshy mesocarp , the endocarp is crusty, there is only one seed, the endosperm of which is very thin.
distribution
The genus is found in the western and southeastern USA, on slopes and river banks, there it grows in shady to open locations, often on limestone soils.
Systematics
The genus was first described by Asa Gray in 1858 . It is classified in the tribe Kerriae, Supertribus Kerriodae of the subfamily Spiraeoideae . There are two types. Both types have chromosome number 2n = 18.
- Neviusia alabamensis A. Gray , widespread in southeastern North America
- Neviusia cliftonii Shevock, Ertter & DW Taylor , endemic to Mount Shasta in Northern California.
The genus has been known for fossil records since the Eocene , Neviusia dunthornei from the Okanogan Highlands of British Columbia is very similar to Neviusia cliftonii .
proof
- C. Kalkman: Rosaceae. In: Klaus Kubitzki (Ed.): The Families and Genera of Vascular Plants - Volume VI - Flowering Plants - Dicotyledons - Celastrales, Oxalidales, Rosales, Cornales, Ericales. Springer-Verlag , Berlin 2004, p. 359, ISBN 978-3-540-06512-8
Individual evidence
- ^ Neviusia at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ ML de Vore, KB Pigg: A brief review of the fossil history of the family Rosaceae with a focus on the Eocene Okanogan Highlands of eastern Washington State, USA, and British Columbia, Canada. Plant Systematics and Evolution, Volume 266, 2007, pp. 45-57. doi : 10.1007 / s00606-007-0540-3
