Sessea
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Sessea is a plant genus of the family of nightshade family (Solanaceae). The species have neotropical distribution. The generic name honors the Spanish military doctor and botanist Martín (de) Sessé y Lacasta (1751 - 1808).
description
The species of Sessea are mostly 2 to 4.5 m high shrubs , but sometimes also trees that can reach a height of 6 to 10 (or less often 25) m. They are usually covered with tree-shaped or candelabra-like branched trichomes . The leaves have a membrane-like or almost leathery surface. They are up to 17 (23) × 5.5 (11) cm long, are lanceolate, elliptical, lanceolate-elliptical or elongated-lanceolate in shape, are sessile or have short (4 to 35 mm) petioles.
The flower stalks are absent or very short at 0.8 to 6 mm. The calyx of the flower is about 1/5 the length of the crown . The five calyx teeth are shaped the same or different. The crown is tubular or slightly funnel-shaped, has a length of (9) 15 to 20 (23) mm and is yellow, greenish-yellow or white-yellowish in color. The five corolla lobes are elongated, have 1/3 to 1/5 (1/8) the length of the corolla tube. The stamens are in the corolla tube, have the same or uneven shape and are fused with the corolla tube at different heights. They are bent to the knee, finely haired and thickened at the point of attachment. The anthers are elliptical, kidney-shaped, spherical or almost spherical. The tip is finely haired. The pollen grains are medium-sized with a diameter of 30 µm. Six to twelve ovules are formed per flower .
The fruits are capsule fruits with few seeds, each (rarely only one) four to eight seeds. The fruits are 9 to 25 mm long and consist of two chambers, each with two columns. The seeds are thin and long, compressed and structured like a roof tile. They have a length of (4) 6 to 8 (13) mm, at both ends there is a clearly defined narrow wing. The embryo is 2 to 3 mm long, the cotyledons are usually shorter and slightly wider than the rest of the embryo.
Occurrence
The genus has a predominantly Neotropical distribution, one species occurs in Haiti . Most of the species are found in the Andes between Colombia and Bolivia , only the range of Sessea corymbiflora extends to Venezuela . In Brazil , with Sessea regenellii , Sessea brasiliensis and Sessea vestioides, three species can be found, the latter also being found in the areas bordering Brazil in Argentina and Paraguay .
Systematics
Internal system
Both in the morphologically based systematics of the nightshade family according to William D'Arcy and Armando Hunziker and in the molecular biological systematics according to Richard Olmstead , the genus is placed in the tribe Cestreae in the subfamily Cestroideae. In addition to the hammer bushes ( Cestrum ), Hunziker only counts the monotypical genus Vestia in this tribe, in which D'Arcy and Olmstead also agree. D'Arcy also places Metternichia , Phrodus and, at that time , Sesseopsis and Olmstead Metternichia , not yet assigned to the Sessea , in this tribe.
External system
Around 27 species are distinguished within the species.
Selection of types:
- Sessea brasiliensis Toledo : It occurs in Brazil.
- Sessea corymbiflora Goudot ex R.Taylor & R.Phillips
- Sessea farinosa (Urb. & Ekman) Francey
- Sessea regnellii Deaf.
- Sessea stipulata Ruiz & Pav.
- Sessea vestioides (Schltdl.) Hunz.
The type species is Sessea stipulata .
Individual evidence
- ↑ Lotte Burkhardt: Directory of eponymous plant names . Extended Edition. Botanic Garden and Botanical Museum Berlin, Free University Berlin Berlin 2018. [1]
- ↑ a b c Armando T. Hunziker: The Genera of Solanaceae. ARG Gantner Verlag KG, Ruggell, Liechtenstein 2001. ISBN 3-904144-77-4 . Pages 36-38.
- ↑ Cf. JAM van Balken: Overview of Solanaceae Species ( Memento of the original from September 29, 2007 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , online.
- ↑ RG Olmstead et al .: Phylogeny and Provisional Classification of the Solanaceae Based on Chloroplast DNA (PDF; 131 kB) . In Solanaceae IV, Advances in Biology and Utilization , editors: M. Nee, DE Symon, JP Jessup, and JG Hawkes, Royal Botanic Gardens, Kew. 1999. Pages 111-137.
- ^ Sessea in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved November 28, 2017.
