Caragana arborescens

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Caragana arborescens
Caragana arborescens.jpg
Shelter break of Caragana arborescens
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Genus: Caragana
Species:
C. arborescens
Binomial name
Caragana arborescens

Caragana arborescens, the Siberian peashrub, [2] Siberian pea-tree, [3] or caragana, is a species of legume native to Siberia and parts of China (Heilongjiang, Xinjiang) and neighboring Mongolia and Kazakhstan. [4] It was taken to the United States by Eurasian immigrants, who used it as a food source while travelling west. In some areas of the United States it is considered an invasive species. Introduced on the Canadian prairies in the 1880's, the hardy caragana provided shelter-belts, wildlife habitat, nitrogen fixation, and wind-breaks to prevent soil erosion and snow drifting.

Contents

Description

It is a perennial shrub or small tree growing 2–6 m (6 ft 7 in – 19 ft 8 in) tall. [4] Typically, it has a moderate to fast growth rate, being able to grow one to three feet during the first year after trimming.

The leaves vary from light green to dark green, and are alternate and compound with many small leaflets. Fragrant yellow flowers bloom in May or June. The fruits are legumes which contain many seeds, and ripen in July. As the seed pods dry they have a tendency to twist and pop open, releasing the seeds. [5]

Uses

Caragana arborescens can be grown as an ornamental plant and bonsai. It has an extensive root system, and can be used in erosion control. The fragrant flowers attract bees.

The seeds are edible, but should be cooked before being eaten. Caragana arborescens contains the non proteinogenic amino acid L-canavanine and may store from nearly 6 to 13% L-canavanine by dry weight. [6] There have been no verified cases of poisoning from consuming the seeds.[ citation needed ] The flowers are also edible, and can be used in salads.

It is recommended for planting in the outer rows of multi-row plantings. It can be used to neutralize soil to prepare for further planting. As a legume, C. arborescens fixes nitrogen. It is suitable for planting in single-row field windbreaks where a dense, short barrier is desired.

C. arborescens is used for nesting by several songbirds. The seeds are occasionally eaten by a few songbirds. The plant is not a preferred food for browsing animals, but its fragrant flowers attract many pollen-consuming animals.

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References

  1. Han, B.; Botanic Gardens Conservation International (BGCI); IUCN SSC Global Tree Specialist Group (2019). "Caragana arborescens". IUCN Red List of Threatened Species . 2019: e.T147642122A147642124. doi: 10.2305/IUCN.UK.2019-2.RLTS.T147642122A147642124.en . Retrieved 6 October 2023.
  2. USDA, NRCS (n.d.). "Caragana arborescens". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 10 January 2016.
  3. BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
  4. 1 2 Yingxin Liu, Chang Zhaoyang & Gennady P. Yakovlev. "Caragana arborescens". Flora of China. Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA. Retrieved 4 July 2012.
  5. Kansas Forest Service: Caragana arborescens Archived February 14, 2015, at the Wayback Machine
  6. [Rosenthal, G.A. (1977). Nitrogen allocation for L-canavanine synthesis and its relationship to chemical defense of the seed. Biochemical Systematics and Ecology 5:219-220.]