SclerochitonLucinda A. McDade and Carrie Kiel
- Sclerochiton harveyanus Nees
- Sclerochiton ilicifolius Meeuse
- Sclerochiton triacanthus Meeuse
- Sclerochiton vogelii (Nees) T. Anderson
Note: this taxon list is still under construction. It does not yet contain all known Sclerochiton subgroups.The list above includes only taxa that were sampled by McDade et al. (2005). There are other species of Sclerochiton that likely belong to this clade but this needs to be confirmed with further study.
Sclerochiton is a mostly eastern and southern African genus of 18 species (Vollesen 1991). There is support from DNA sequence data for monophyly of this genus, and the plants share a small prickle on the medial ventral surface of the anthers. As described in our discussion of Streptosiphon and Crossandrella, molecular data place these last two genera with Sclerochiton with strong support but morphological evidence is not as clear. Notably, Sclerochiton shared remarkably bony filaments and insertion of the filaments into of thickened flange of the internal corolla surface with Cynarospermum - Acanthus clade; Streptosiphon and Crossandrella lack these androecial traits. On the other hand, Crossandrella shares the remarkable four lobed , "fused, sheathing, reduced" calyx with Cynarospermum - Acanthus clade where Sclerochiton lacks this trait. It will be interesting to see whether more data and/or study of additional characters clarifies these enigmas.
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.
Vollesen, K. 1991. A revision of the African genus Sclerochiton (Acanthaceae: Acantheae). Kew Bulletin 46: 1-50.
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. Sclerochiton. Version 13 September 2006 (under construction). http://tolweb.org/Sclerochiton/52317/2006.09.13 in The Tree of Life Web Project, http://tolweb.org/