Amsonia

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Amsonia
Amsonia tabernaemontana

Amsonia tabernaemontana

Systematics
Euasterids I
Order : Enzianartige (Gentianales)
Family : Dog poison family (Apocynaceae)
Subfamily : Rauvolfioideae
incertae sedis
Genre : Amsonia
Scientific name
Amsonia
Walter

The Amsonia ( Amsonia ) are a genus of plants from the dog venom family (Apocynaceae). The genus was named in honor of the American doctor and botanist Charles Amson , who lived in the 18th century.

features

The species are annual or herbaceous perennials . They grow upright, reach a height of one meter and do not form runners. They form milky juice. The leaves are alternate.

The inflorescences are thyrsen-like or umbrella-shaped cymes . You are at the terminal. The flowers are blue or bluish. The sepals are narrowly pointed and usually glandless. The flowers are plate flowers. The corolla tube is cylindrical, widens over the middle and is shaggy inside. The corolla lobes overlap to the left. The stamens start in the enlarged part of the corolla tube. The anthers are ovate to oblong, and free from the stigma . The carpels are connected by the thread-like stylus . The ovules are numerous. The scar has a basal, membranous appendix.

The seeds are cylindrical.

Amsonia hubrichtii
Amsonia illustris
Oriental squill ( Amsonia orientalis )

distribution

The species are native to North America and Southeast Asia.

Systematics

The genus is usually placed in the tribe Vinceae within the subfamily Rauvolfioideae . However, gene sequence analyzes do not confirm this classification.

Around 20 species are counted to the genus Amsonia. In the following list of recognized species, in addition to the botanical author abbreviation, the publication with the year of publication of the first description is given:

  • Amsonia ciliata Walter , Fl. Carol .: 98 (1788): It occurs in three varieties in the central and southeastern United States.
  • Amsonia elliptica (Thunb.) Roem. & Schult. , Syst. Veg. 4: 432 (1819): It occurs in southeastern China, Japan, and Korea.
  • Amsonia fugatei S.P. McLaughlin , SW Naturalist 30: 563 (1985): It occurs only in New Mexico.
  • Amsonia grandiflora Alexander , Torreya 34: 116 (1934): It occurs in southern Arizona and Mexico.
  • Amsonia hubrichtii Woodson , Rhodora 45: 328 (1943): It is found in Arkansas and Oklahoma.
  • Amsonia illustris Woodson , Ann. Missouri Bot. Gard. 16: 404 (1929): It occurs from Iowa to Texas.
  • Amsonia jonesii Woodson , Ann. Missouri Bot. Gard. 15: 414 (1928): It occurs in southwestern Colorado, southern Utah, Arizona, and New Mexico.
  • Amsonia kearneyana Woodson , Ann. Missouri Bot. Gard. 15: 415 (1928): It occurs only in Arizona.
  • Amsonia longiflora Torr. in WHEmory, Rep. US Mex. Bound. 2 (1): 159 (1858): It occurs in two varieties in Texas, New Mexico, and northeastern Mexico.
  • Amsonia ludoviciana Small , Fl. SEUS: 935 (1903): It occurs from eastern Texas to Georgia.
  • Oriental squill ( Amsonia orientalis Decne. In V. Jacquemont, Voy. Inde: 105 (1843)): It occurs from Greece to only northwestern Turkey.
  • Amsonia palmeri A. Gray , Proc. Amer. Acad. Arts 12: 64 (1877): It occurs from Arizona to Texas and northern Mexico.
  • Amsonia peeblesii Woodson , Bull. Torrey Bot. Club 63: 35 (1936): It is only found in northern Arizona.
  • Amsonia repens Shinners , Field & Lab. 19: 126 (1951): It occurs in Texas.
  • Amsonia rigida Shuttlew. ex Small , Fl. SEUS 1: 93 (1903): It occurs from Louisiana to northern Florida.
  • Amsonia tabernaemontana Walter , Fl. Carol .: 98 (1788): It occurs in two varieties in the central and eastern United States.
  • Amsonia tharpii Woodson < , Ann. Missouri Bot. Gard. 35: 237 (1948): It occurs in New Mexico and Texas.
  • Amsonia tomentosa Torr. & Frém. in JCFrémont, Rep. Exped. Rocky Mts .: 316 (1845): It occurs in two varieties in the southern United States and northeastern Mexico.

use

Some species like Amsonia tabernaemontana are grown as ornamental plants.

supporting documents

Individual evidence

  1. ↑ Lotte Burkhardt: Directory of eponymous plant names . Extended Edition. Botanic Garden and Botanical Museum Berlin, Free University Berlin Berlin 2018. [1]
  2. ↑ Helmut Genaust: Etymological dictionary of botanical plant names. Birkhäuser, Basel / Stuttgart 1976, ISBN 3-7643-0755-2 .
  3. ↑ K. Potgieter, VA Albert: Phylogenetic relationships within Apocynaceae sl based on trn L intron and trn L-F spacer sequences and propagule characters. Ann. Miss. Bot. Gard. 88, 2001, pp. 523-549.
  4. ↑ Rafaël Govaerts (ed.): Amsonia. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved March 27, 2008.
  5. ↑ a b c d e f g h i j k l m n o p q r Rafaël Govaerts (Ed.): Amsonia - World Checklist of Selected Plant Families des Royal Botanic Gardens, Kew. Last accessed on November 19, 2018.
  6. ↑ a b c Flora of Missouri
  7. ↑ Flora of China

Web links

Commons : Amsonia ( Amsonia )  - collection of images, videos and audio files