Graduate Thesis Or Dissertation
 

A revision of Juncus subgenus genuini (Juncaceae) in the Pacific states

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  • A study was made of the subgenus Genuini of the genus Juncus in the Pacific States, California, Oregon and Washington. Extensive morphological comparisons, geographical distributions, habitat differences and observations of apparent presence or absence of natural hybrids provided the major data sources. Cytological studies were made, but were inconclusive. Eleven species and nine subspecies are recognized, comprising four species complexes. The Juncus effusus complex includes three broadly sympatric species and five subspecies, J. effusus subsp. pacificus, subsp pugetensi and subsp. austrocalifornicus; J. exiguus subs. exiguus and subsp. gracilis; and J. hesperius. The J. balticus complex including J. breweri, J. lescurii, J. textilis and four subspecies of J. halticus, forms an extensive syngameon of intergrading populations. The widely distriudzed J. Lalticus subsp. mexicanus apparently hybridizes naturally with each of the other species and subspecies in the complex, except the coastal J. balticus subsp. occidentalis which hybridizes with J. breweri. Juncus balticus subsp. cascadensis and subsp. vallicola are mostly montane and interior taxa, the latter reaching the coast in the San Francisco Bay and Puget Sound regions. Juncus lescurii of the San Francisco Bay region is considered to be a probable hybrid between the coastal dune species, J. breweri, and one or more subspecies of J. balticus. A third complex, J. filiformis and J. patens appears to be distinctive and presents no taxonomic problems. Juncus drummondii and J. parryi, which comprise a fourth complex, are usually considered to be part of subgenus Genuini, although they differ from the other species in several important characters. No comprehensive observations were made of these two distinctive species, their inclusion in this study being limited to taxonomic considerations.
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