Amsonia

Amsonia tabernaemontana

The Amsonien ( Amsonia ) are a genus of the family of the dogbane family ( Apocynaceae ). The genus was named in honor of the American botanist Charles Amson.

Features

The species are annual or perennial herbaceous plants. They grow upright, are reaching a meter high and do not form spurs. They make milk juice. The leaves are alternate.

The inflorescences are thyrsenartige or umbrella-shaped Zyme. They are terminal. The flowers are blue or bluish. The sepals are narrow pointed, and usually drüsenlos. The flowers are stem plate flowers. The corolla tube is cylindrical, extended over the center and inside is shaggy. The corolla lobes overlapping to the left. The stamens are recognized in the extended part of the corolla tube. The anthers are ovate to oblong, and free from the scar. The carpels are connected by the thread-like stylus. The ovules are numerous. The scar has a basal membranous attachment.

The seeds are cylindrical.

Dissemination

The species are native to North America and Southeast Asia.

System

The genus is found mostly in the tribe Vinceae within the subfamily Rauvolfioideae. Gene sequences not confirm this arrangement, however.

The genus of about 20 species Amsonien be counted. The following list of recognized species next to the botanical author abbreviation is indicated by the publication year of publication of the first description:

  • Amsonia ciliata Walter, Fl. Carol: . 98 ( 1788). In North America
  • Amsonia elliptica ( Thunb. ) Roem. & Schult., Syst. Veg. 4: 432 ( 1819). In East Asia
  • Amsonia fugatei SPMcLaughlin, SW Naturalist 30: 563 (1985).
  • Amsonia grandiflora Alexander, Torreya 34: 116 (1934 ).
  • Amsonia hubrichtii Woodson, Rhodora 45: 328 ( 1943).
  • Amsonia illustris Woodson, Ann. Missouri Bot Gard. 16: 404 ( 1929). In North America
  • Amsonia jonesii Woodson, Ann. Missouri Bot Gard. 15: 414 ( 1928).
  • Amsonia kearneyana Woodson, Ann. Missouri Bot Gard. 15: 415 (1928).
  • Amsonia longiflora Torr. in W.H.Emory, Rep. U.S. Mex. Bound. 2 (1): 159 (1858 ).
  • Amsonia ludoviciana Small, Fl. S. E. U.S.: 935 (1903 ).
  • Amsonia orientalis Decne. in V.Jacquemont, Voy. Inde: 105 (1843 ).
  • Amsonia palmeri A. Gray, Proc. Amer. Acad. Arts 12: 64 (1877 ).
  • Amsonia peeblesii Woodson, Bull Torrey Bot Club 63: 35 (1936).
  • Amsonia repens Shinners, Field & Lab. 19: 126 ( 1951).
  • Amsonia rigida Shuttlew. ex Small, Fl. S. E. U.S. 1: 93 (1903 ).
  • Amsonia tabernaemontana Walter, Fl. Carol: . 98 ( 1788). In North America
  • Amsonia tharpii Woodson, Ann. Missouri Bot Gard. 35: 237 (1948 ).
  • Amsonia tomentosa Torr. & Frem. in J.C.Frémont, Rep. Exped. Rocky Mts. 316 ( 1845).

Use

Some species such as Amsonia tabernaemontana be planted as ornamentals.

Documents

  • Flora of China, Volume 16, pp. 156
Gentianales Thomas Walter (botanist) Perennial plant Stigma (botany)
58871
de