The Flowering Plants: Flowering Rush to Rushes

Species Excluded

Species Excluded Calla palustl'is L. Brendel first reported the water arum from Illinois in 1859, and McDougall, in 1936, reported that the species occurred in cold bogs in Lake and McHenry counties. I have been unable to find any specimens of this species preserved from Illinois. The natural range is slightly to the north and east of Illinois. Eriocaulon septangulare With. Although the pipewort is found in Wisconsin and Indiana, there are no specimens known from Illinois despite Muenscher's report of it from this state in 1944. Juncus brevicaudatus (Engelm.) Fern. Despite Fernald's report of this species from Illinois in 1950, the specimen on which his report is based is J. canadensis J. Gay ex Laharpe. Orontium aquaticum L. The golden club, an aquatic eastern perennial known as far west as West Virginia and Kentucky, was reported by Vasey from Illinois in 1861 but, as no specimens have been discovered from Illinois, I assume Vasey's report was in error. Potamogeton capillaceus Poir. Kibbe reported this essentially Coastal Plain species from Hancock County in 1952, but the specimen on which this identification was based is P. diversifolius Raf. Potamogeton compressus L. Patterson (1876) misunderstood this species when he reported it from Illinois, confusing it with P. f1'iesii Rupr. Potamogeton dimol'phus Raf. Pepoon's reference (1927) to this species from Illinois is actually meant for P. diversifolius Raf., since these two species were frequently confused early in the twentieth century. Potamogeton fluitans Roth. Mead, who first recorded this binomial from Illinois in 1846, and other Illinois botanists were actually misidentifying specimens of P. nodosus Poir. Potamogeton hete1'Ophyllus Schreb. Schreber's binomial has frequently been misapplied to Illinois specimens of P. gramineus L., but actually it refers to an entirely different species unknown from the eastern United States. Potamogeton hybridus Petagna. Lapham (1857) first re249 250 / R U S H TOR U SHE S corded this species from Illinois, and was followed by both Patterson (1874) and Brendel (1887). The material on which their identifications were made is really P. divel'sifolius Raf. Potamogeton intel'1'Uptus Kitaibel in Schultes. Specimens on which the report, in 1927 by Pepoon, of this species from Illinois was based were collected by E. J. Hill in 1881 in South Chicago. Since the specimens are sterile, it is not possible to identify them positively, but they probably represent P. pectinatus L., a species with which P. intel'l'uptus often is combined. Potamogeton lonchites Tuckerm. The various reports of this species from Illinois by Patterson (1876), Schneck (1876), and Brendel (1887) would have been for P. nodosus PoiI'. Potamogeton lucens L. There has been much confusion regarding this binomial which refers to a species generally restricted to the Old World. The Illinois specimens which have been called this are P. illinoensis Morong. Potamogeton pel'foliatus L. This species, restricted to boreal North America and the Old World, has been confused by Patterson (1876) for P. l'ichal'dsonii (Benn.) Rydb. Potamogeton spil'illus Tuckerm. Reported by both Patterson (1876) and Brendel (1887), this is one of several species confused with P. divel'sifolius Raf. and erroneously attributed to Illinois. It should be pOinted out, however, that the range of P. spil'illus includes Illinois and it may well be that this species occurs somewhere in the state. ' Potarnogeton zostel'ifolius Schum. Until Fernald (1932) pointed out that P. zosterifolius was entirely different from our American material, this binomial was used for what is now P. zostel'ifol'mis Fern. Spal'ganium angustifolium Michx. This species was originally attributed to Illinois in 1944 by Muenscher and later recorded by Fernald (1950) from Illinois. I have not been able to locate any Illinois specimens of this species. Spal'ganium natans L. Vasey's report in 1861 of this species from Illinois is apparently in error. Vallisnel'ia spimlis L. In earlier days, distinction was not made between Linnaeus' V. spimlis and the specimens of Vallisneria found in eastern North America. It is now clear that the American plants are distinct and should be known as V. americana Michx. WolfJia brasiliensis Wedd. This species does not occur in Illinois, although attributed to this state by Patterson (1876), Species Excluded I 251 Brendel (1887), and Hegelmaier (1896). Since there is morphological similarity between this species and W. punctata, the references must have been intended for W. punctata. Xyris flexuosa Muh!. ex Ell...