Streptosiphon hirsutusLucinda A. McDade and Carrie Kiel
Streptosiphon is a genus of a single species that occurs in Tanzania. This plant is unique among Acantheae in having corollas that are resupinate (i.e., upside down) via twisting of the tube through 180 degrees. Although our molecular data place Streptosiphon as part of the Schlerochiton clade, other characters suggest other affinities. For example, like Crossandrella and some species of Crossandra, these plants have 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. Our molecular data, as well as other morphological characters, strongly suggest that this pollen type has evolved several times in Acantheae.
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Rancho Santa Ana Botanic Garden, Claremont, California, USA
Rancho Santa Ana Botanic Garden
Correspondence regarding this page should be directed to Lucinda A. McDade at and Carrie Kiel at
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- First online 13 September 2006
- Content changed 13 September 2006
Citing this page:
McDade, Lucinda A. and Carrie Kiel. 2006. Streptosiphon. Streptosiphon hirsutus http://tolweb.org/Streptosiphon_hirsutus_/52316/2006.09.13 in The Tree of Life Web Project, http://tolweb.org/. Version 13 September 2006 (under construction).