Euruellia cladeErin Tripp
- Ruellia brittoniana Leonard
- Ruellia ciliatiflora Hook.
- Ruellia coerulea Morong
- Ruellia drummondiana (Nees) A. Gray
- Ruellia edwardsae Tharp & F. A. Barkley
- Ruellia hygrophila Mart.
- Ruellia jimulcensis
- Ruellia lactea Cav.
- Ruellia macrosolen Lillo ex. C. Ezcurra
- Ruellia malaca Leonard
- Ruellia metzae Tharp
- Ruellia morongii Britton
- Ruellia nudiflora (Englem & A. Gray) Urb.
- Ruellia runyonii Tharp & F. A. Barkley
- Ruellia tuberosa L.
Note: this taxon list is still under construction. It does not yet contain all known Euruellia clade subgroups.
Like Physiruellia, species in the Euruellia clade are characterized by having dichasial, highly branched inflorescences with flowers that are generally long-pedunculate. In contrast to Physiruellia, fruits of species in this group are ellipitical in shape (with seeds borne nearly all the way to the base), and seeds have hygroscopic trichomes that cover their entire surface. Fruits contain many ovules, generally 14-28.
Most although not all species in Euruellia have purple, actinomorphic corollas (functionally zygomorphic) with well-developed landing platforms, suggestive of bee pollination. Species in this group often inhabit open areas and display somewhat of a disjunct distribution: most occur in either temperate to subtropical areas of southern South America or in the USA and central Mexico.
Euruellia contains a difficult species complex centered around Ruellia nudiflora (which is a non-monophyletic species based on Tripp, in press). It also contains the type species of Ruellia, R. tuberosa.
Ezcurra, C. 1993. Systematics of Ruellia (Acanthaceae) in southern South America. Ann. Mo. Bot. Gard. 80: 787-845.
Tripp, E. A. Evolutionary relationships within the species-rich genus Ruellia (Acanthaceae). Systematic Botany, in press.
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- First online 10 April 2007
- Content changed 10 April 2007
Citing this page:
Tripp, Erin. 2007. Euruellia clade. Version 10 April 2007 (under construction). http://tolweb.org/Euruellia_clade/96993/2007.04.10 in The Tree of Life Web Project, http://tolweb.org/