Mentzelia

Mentzelia laevicaulis

Mentzelia is a plant genus of the family of flowers nettle plants ( Loasaceae ). It contains about 80 species that are native to North, South and Central America. The scientific genus name honors the German physician and botanist Christian Mentzel ( 1622-1701 ).

Description

These are annual or perennial herbaceous plants, subshrubs, shrubs or small trees that are occupied with pungent, but not stinging hairs and grow from a strong taproot. The lower leaves are opposite, the upper alternate, the leaf blades are ovate to triangular- ovate, sometimes pinnate, usually lobed, however, the edge is sharpened to cut.

The inflorescences are complex, terminal, basiton and thyrsenähnlich, occasionally with a long, final monochasium. Before every single bloom frondose two bracteoles. The petals are white, yellow or orange.

The stamens are numerous ( rarely 10), the stamens of equal to strongly unequal size, the outer stamens are occasionally widened or bifurcated at the top, sometimes there are kronblattartige staminodes. The scar is punctiform.

The fruit is a constant under, sessile or stalked capsule and opens the basis of three to seven tabs at the top of the fruit. The seeds are flattened rectangular or sideways. The number of chromosomes is 2n = 9, 10, 11, 14, 18, 27 or 36

Dissemination

The genus is found from Canada to Argentina and radiates down to the Galapagos Islands and the Caribbean. Manifold center is Mexico and the southwestern United States. They settle mostly deserts and semi-deserts, some species but are also found in grasslands and rain forests.

System

Mentzelia was first described in 1753 by Carl Linnaeus. The genus is classified in the subfamily Mentzelioideae. The genus includes about 80 species, including:

  • Mentzelia albescens ( Gillies ex Arn. ) Griseb.
  • Mentzelia albicaulis ( Douglas ) Douglas ex Torr. & A. Gray
  • Mentzelia aspera L.
  • Mentzelia conzattii Greenm.
  • Mentzelia cordifolia Dombey ex Urb. & Gilg
  • Mentzelia crocea Kellogg
  • Zehnblättrige Mentzelie ( Mentzelia decapetala ( Pursh ex Sims ) Urb. & Gilg )
  • Mentzelia densa Greene
  • Mentzelia dispersa S. Watson
  • Mentzelia fendleriana Urb. & Gilg
  • Mentzelia hirsutissima S. Watson
  • Mentzelia involucrata S. Watson
  • Glattstängelige Mentzelie ( Mentzelia laevicaulis ( Douglas ) Torr. & A. Gray )
  • Mentzelia leucophylla Brandegee
  • Lindley- Mentzelie ( Mentzelia lindleyi Torr. & A. Gray )
  • Mentzelia mollis M. Peck
  • Mentzelia multiflora ( Nutt. ) A. Gray
  • Mentzelia nuda ( Pursh ) Torr. & A. Gray
  • Mentzelia oligosperma Nutt.
  • Mentzelia packardiae Glad.
  • Mentzelia parvifolia Urb. & Gilg ex Kurtz
  • Mentzelia pumila ( Nutt. ) Torr. & A. Gray
  • Mentzelia rhizomata Reveal
  • Mentzelia scabra Kunth.

Evidence

  • Maximilian Weigend: Loasaceae. In: Klaus Kubitzki (ed.): The Families and Genera of Vascular Plants. Volume 6: Flowering Plants, Dicotyledons: Celastrales, Oxalidales, Rosales, Cornales, Ericales. Springer, Berlin / Heidelberg / New York 2004, ISBN 3-540-06512-1, pp. 248, doi: 10.1007/978-3-662-07257-8 ( limited preview on Google Book Search ).
  • Maximilian Weigend: Familial and generic classification. Online, accessed on 1 August 2008
Asterids Stigma (botany) Digital Object Identifier
564267
de