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This taxonomic revision of the recently reconstituted genus Orthocarpus is based on herbarium and field studies, evidence from floral morphology, SEM studies of seed and seed-coat morphology, chromosome numbers, habitat, and geographical distribution. Nine species and five subspecies are recognized. Keys to species and subspecies and a complete synonymy of taxa are provided. Each species and subspecies is illustrated with line drawings showing habit and floral morphology; distribution maps indicate sites of known populations for each taxon. One new sub- species, Orthocarpus tolmiei subsp. holmgreniorum, is described and two new combinations, Orthocarpus cuspidatus subsp. copelandii and subsp. cryptanthus, are proposed. It has been more than 60 years since Keck's 1927 revision of Orthocarpus Nutt., a discerning and useful treatment that was prepared chiefly on the basis of field observation and the her- barium specimens then available. Although Keck's treatment has served admirably, there is now a need for updating his work by reassess- ing intergeneric and infrageneric relationships, and providing a new and comprehensive tax- onomic revision. |
