Crossandrella duseniiLucinda A. McDade and Carrie Kiel
Note: this taxon list is still under construction. It does not yet contain all known Crossandrella subgroups.
Crossandrella is a West African genus of two species. These plants are unique among Acantheae in having beaked capsules that crack transversely at maturity. Although our molecular data place Crossandrella as part of the Schlerochiton clade, other characters suggest other affinities. For example, with Cynarospermum, Blepharis, Acanthopsis and the Acanthus clade, plants of Crossandrella share the four-lobed, "fused, sheathing, reduced" calyx. In contrast, with Sclerochiton and some species of Crossandra, plants of Crossandrella share remarkable pollen that is shaped rather like a Toblerone chocolate bar: triangular in polar view, elongate in equatorial view, and with open areas (caveae) at the 'points' of the triangle. In sum, Crossandrella presents a mosaic of characters that do not permiit an entirely satisfactory placement of the genus.
McDade, L. A., T. F. Daniel, C. A. Kiel, and K. Vollesen. 2005. Phylogenetic relatinships among Acantheae (Acanthaceae): Major lineages present contrasting patterns of molecular evolution and morphological differentiation. Systematic Botany 30: 834-862.
Rancho Santa Ana Botanic Garden
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- First online 13 September 2006
- Content changed 13 September 2006
Citing this page:
McDade, Lucinda A. and Carrie Kiel. 2006. Crossandrella. Crossandrella dusenii http://tolweb.org/Crossandrella_dusenii/52315/2006.09.13 in The Tree of Life Web Project, http://tolweb.org/. Version 13 September 2006 (under construction).