Orthocarpus purpureoalbus Orthocarpus luteus Orthocarpus tolmiei Orthocarpus holmgreniorum Orthocarpus barbatus Orthocarpus bracteosus Orthocarpus cuspidatus Orthocarpus imbricatus Orthocarpus purpureo-albus Orthocarpus pachystachyus Orthocarpus tenuifolius
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024