| 21. | Corolla tube 12 27 mm long and lobes are erect to spreading of about 2.4 4.4 mm in length.
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| 22. | ""'Strophanthus boivinii " "'grows as a deciduous shrub or small tree sometimes up to tall, with a corolla tube.
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| 23. | Its fragrant flowers feature a pink with white turning red corolla tube, white turning yellow with red spots and streaks inside.
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| 24. | The flower itself serves as a biological myiophilous ( fly-pollinated ) pitfall-trap, that traps flies when they descend into the corolla tube.
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| 25. | The cylindrical corolla tube is white, the upper lip pale blue, and the lower lip bright blue, flowering from October to December.
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| 26. | The corolla has five petals, the corolla tube of most species being split nearly to its base, forming two lips or lobes.
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| 27. | Their maxillae are " sharp and wedge-shaped ", allowing them to split the side of corolla tubes externally to access the nectar.
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| 28. | It is distinguished from related species by its corolla tube 7 10 mm long, with obovate lobes 4 6 mm x 2 3 mm.
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| 29. | It appears that the long, narrow corolla tube evolved only once in " Clerodendrum ", and appeared again, among its relatives, in " Ovieda ".
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| 30. | Forms with a straight corolla tube that were previously included within the species were reclassified by Craven in 2002 as " R . viriosum ".
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