Koeberlinia spinosa
| Koeberlinia spinosa | ||||||||||||
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Koeberlinia spinosa |
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| Systematics | ||||||||||||
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| Koeberliniaceae | ||||||||||||
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| Koeberlinia | ||||||||||||
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| Koeberlinia spinosa | ||||||||||||
| Zucc. |
Koeberlinia is the only plant of monotypic genus Koeberlinia , the only genus of the family of Koeberliniaceae within the order of Kreuzblütlerartigen (Brassicales). The genus is named after the German priest and botanist Christoph Ludwig Köberlin (1794–1862).
distribution
It is native to the arid regions of the southern USA and Mexico from Lower Rio Grande through Trans-Pecos Texas to southeastern Arizona and south to northern Mexico. There is also proof of Bolivia .
description
Koeberlinia spinosa usually grows as a thorny shrub , rarely as a small tree . It is a xerophyte that has no leaves for most of the year. The green branches take over photosynthesis . The bark is initially greenish and later turns dark gray-brown, rough and scaly. The opposite leaves, which exist only for a short time after the spring rain, are simple, membranous, tiny (1.5 to 2.2 mm) and scale-shaped. Stipules are missing.
The flowers are in racemose inflorescences together with tiny bracts. The hermaphroditic flowers are radially symmetrical and fourfold; they look similar to those of the cruciferous family . The four small, free sepals are cross-opposite to one another. The four free petals are nailed and greenish-white. There are two circles of four free, fertile stamens each. The pollen is tricolporate. Two to five carpels have become a top permanent ovary grown. There are 5 to 50 ovules per ovary compartment .
A fleshy, few-seeded berry is formed that turns shiny black when ripe. The seeds are black and hard.
The number of chromosomes is 2n = 44 or about 88.
Systematics
This genus was previously classified in the Celastraceae family. The closest related are the Bataceae and Salvadoraceae .
There are two subspecies of the species:
- Koeberlinia spinosa Zucc. subsp. spinosa
- Koeberlinia spinosa Zucc. subsp. tenuispina (Kearney & Peebles) AE Murray : It occurs in Arizona, California, Baja California, Baja California Sur and Sonora.
swell
- The family of Koeberliniaceae in APWebsite (Engl.)
- The Koeberliniaceae family at DELTA. (engl.)
- Klaus Kubitzki: Koeberliniaceae in Klaus Kubitzki: The Families and Genera of Vascular Plants. Flowering plants. Dicotyledons. Malvales, Capparales and Non-betalain Caryophyllales. , Springer Verlag, Berlin 2002, Volume V, pp. 218-219. ISBN 3-5404-2873-9
- Data sheet and distribution map from Virginia Tech's College of Natural Resources .
Individual evidence
- ↑ Koeberlinia spinosa at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ^ Gordon C. Tucker: Koeberliniaceae. In: Flora of North America, vol. 7. [1] .
Web links
- Characteristics.
- Hiroshi Tobe & Peter H. Raven: Embryology of Koeberlinia (Koeberliniaceae): Evidence for core-Brassicalean affinities : Abstract Online.