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SiDA 16(2) 1994 Wabash Crow from and seen Coles ILLS); (1978) included rhese v cos., range of variation ofS. decumbens. — RichardK. Rabeler, University Michigan Herbarium, North University Build- of Ml Ann 48109-1037, Arbor, U.S.A. ing, A Crow, G.E. 1978. taxonomic revision of5tf^/W (Caryophyllaceae) in Norcli America. Rhoclora 80:1-91. Hattaway, R.A. 1987. Arenaria groenlandica (Retz.) Sprang, var. groenlandka in the Midwest. MOHLENBROCK, R.H. Guide 1986. to the vascular flora of Illinois, rev. ed. Southern Illinois & Univ. Carbondale EdwardsviUe. Press, MoHLENBROCK, R.H. and D.M. Ladd. 1978. Distribution of Illinois vascular plants. Southern & Univ. Carbondale EdwardsviUe. Illinois Press, SwiNK, F. and G. Wilhelm. 1979. Plants of the Chicago region, rev. ed. The Morton Arbore- NEW A EMILIA FOSBERGII (ASTERACEAE: SENECIONEAE), INTRO- DUCTION TO TEXAS— Old World Emilia an genus with approximately is 45 species, three of which have become neotropical weeds (Nicolson 1975). Until recently Emilia Nicolson has been reported the United fosbergii in States & weed growing only as a casual in southern Florida (Cronquist 1980; Barkley Cronquist 1978). 40 In the of 1993, a population of approximately individuals of Emilia fall fosbergii was found growing in and around a gravelly path in a south Austin Upon me manager nursery. inquiry the informed that the nursery has suppliers which might in Florida, explain the presence of this weed. TEXAS. Voucher specimen: Travis Co.: City of Austin, A-1 Grass Nursery, two blocks S of Barton Skyway along S Lamar St., growing in gravel of parking lot and planting area, 20 Nov l995,WiUiamss.n.{TEX). Emilia fosbergii distinguished from other Texas genera in the Senecioneae is by the red disk flowers and absent ray flowers. The receptacle to slightly is flat convex, the leaves are alternate. Unwmity TX78713, Texas, Austin, of , REFERENCES Barkley,T.M. and A. Cronquist. 1978. Emiiia. In: N. Amer. Fl., Ser. II, 10:147-150. Cronquist, a. 1980. Vascular flora of the southeastern United States. Vol. Asteraceae. Univ. I. North Carolina Press, Chapel Hill. N1COI.SON, D.H. 1975. Emilia fosbergii, a new species. Phytologia 32:33. NEW COLLECTION RECORDS FOR THE AQUATIC MACROPHYTES AND CERATOPTERIS THALICTROIDES (PARKERIACEAE) TEXAS— LIMNOPHILA SESSILIFLORA (SCROPHULARIACEAE) IN The spring systems that arise along the Balcones fault zone of central Texas support number a diversity of aquatic macrophytes, including a of adventive species that Ramamoorthy have not been reported from elsewhere in the state (Lemke 1989, & & Lemke The Turner 1992, Angerstein 1994). upper San Marcos River in community Hays County, Texas, supports a macrophyte comprising thirty-one species (Lemke 1989), two of which, Ceratoptens thalktroides (L.) Brongn. and Linmophila BL, have not previously been reported elsewhere in Texas sessiltflora & fromLanda (Correll Johnston 1970). Recent collections of aquatic macrophytes damming Comal Lake, a small reservoir formed by the of the headwaters of the New Comal documented River in Braunfels, County, Texas, have the presence two system of these species in this river as well. homosporous aquatic fern Ceratopteris thalktroides a tropical, free-floating, is and that has been introduced into Florida, Louisiana, Texas, California (Lloyd The was reported from Texas by Morton (1967) and 1993). species first its introduction into the San Marcos River by a local aquarium plant supply com- Hannan The pany was documented by (1969). following collection represents only the second county record for the species in Texas: Voucher specimen: TEXAS. Comal Co.: free-floaring along north shore of Landa Lake, Landa New l6Apr \99A,Umke4163 (SWT). Park, City of Braunfels, submersed emergent macrophyte indigenous Linmophila a or to sessiliflora is India and Southeast Asia. resembles the native species Cabomba cawliniana A. It Gray in gross morphology, but can be easily distinguished in the vegetative state by bright green coloration, more compact growth habit, and verticillate its Limnophila reported to be sporadically naturalized in Florida leaves. sessiliflora is and Georgia; the following collection represents only the second county record for the species in Texas: Comal Voucher specimen: Texas. Co.: submerged along north shore of Landa Lake, Landa