Part 7 - UNC Herbarium

XYRIDACEAE 949
Xyris elliottii Chapman, Elliott's Yellow-eyed Grass. Cp (GA, SC): margins of drawdown zones of clay-based Carolina
bays, limesinks and flatwoods swales, wet savannas; uncommon. May-June. E. SC south to the Gulf Coastal Plain. [= RAB,
FNA, GW, K, S, X, Z]
Xyris fimbriata Elliott, Giant Yellow-eyed Grass. Cp (GA, NC, SC, VA): in mucky or sandy soils of upland depression
ponds, also along sandhill streams, impoundments and in deep muck of sandhills seepage slopes often just below the zone
occupied by Xyris chapmanii; common (VA Rare). September-October. Se. VA south to c. FL, west (interruptedly) to se. TX;
disjunct in s. NJ, DE, and c. TN. [= RAB, C, F, FNA, G, GW, K, S, X, Z]
Xyris flabelliformis Chapman, Savanna Yellow-eyed Grass. Cp (GA, NC, SC): wet sands of pinelands, especially
seasonally wet, open, white sands of spodosol longleaf pine flatwoods (Leon series soils), margins of Carolina bay sandrims; rare
(NC Rare, SC Rare). May-June. Se. NC south to s. FL, west to se. LA, on the Coastal Plain. [= RAB, FNA, GW, K, S, X, Z]
Xyris floridana (Kral) Bridges & Orzell, Florida Yellow-eyed Grass. Cp (GA, NC, SC): savannas, wet pine flatwoods,
ditches; rare (NC Rare, SC Rare). August. Se. NC south to s. FL, west to se. LA. [= X; = Xyris difformis Chapman var.
floridana Kral – FNA, GW, K, Y, Z]
Xyris iridifolia Chapman, Irisleaf Yellow-eyed Grass. Cp (GA, NC, SC, VA): marshes, upland pond margins, blackwater
river channels, floodplain pools, other wet habitats; uncommon (NC Watch List, VA Rare). July-September. Se. VA south to n.
FL, west to e. TX; disjunct in c. TN. [= RAB, C, GW, S, Z; = X. laxifolia Mart. var. iridifolia (Chapman) Kral – FNA, K, X]
Xyris jupicai L.C. Richard. Cp (GA, NC, SC, VA), Pd (NC), Mt (VA): ditches, various wet habitats; common. July-
September. NJ south to s. FL, west to TN, AR, OK, and TX, and in Latin America. Sometimes weedy and considered by some
to be adventive from further south. At least some populations in our area are native and may additionally be worthy of
taxonomic recognition as distinct from "true" X. jupicai (P. McMillan, pers. comm., 2003). [= RAB, C, FNA, GW, K, W, X, Z;
= F. caroliniana – F, misapplied; > X. elata Chapman – G, S; > X. communis Kunth – S; > X. caroliniana – G, S, misapplied]
Xyris louisianica Bridges & Orzell. Cp (GA): pine savannas, bogs, ditches and disturbed areas; rare. FL Panhandle and
GA west to se. TX. [= K, X; = X. stricta Chapman var. obscura Kral – FNA; < X. ambigua – GW, S, Z]
Xyris platylepis Chapman. Cp (GA, NC, SC, VA): sandhill seeps, savannas, ditches; common (VA Watch List). July-
September. Se. VA south to s. FL, west to se. LA; disjunct in sw. LA and se. TX. [= RAB, C, F, FNA, G, GW, K, S, X, Z]
Xyris scabrifolia Harper, Roughleaf Yellow-eyed Grass. Cp (GA, NC, SC): sandhill seepage bogs and wet pine savannas;
rare (US Species of Concern, NC Rare). Sc. and se. NC south to panhandle FL, west to s. AL and s. MS; disjunct in sw. LA-se.
TX. X. chapmanii is a taxon distinct from X. scabrifolia. [= GW, S, X; < X. scabrifolia – FNA, K, Z (also see X. chapmanii)]
Xyris serotina Chapman. Cp (GA, NC, SC): depression meadows, ultisol savannas (Lynchburg/Rains complex or
Eulonia/Oketee), ditches; rare (NC Rare, SC Rare). September. Se. NC south to c. FL, west to s. MS, in the Coastal Plain.
Reported for our area by Kral (1966b) and relocated by B.A. Sorrie. [= RAB, FNA, GW, K, S, X, Z]
Xyris smalliana Nash, Small's Yellow-eyed Grass. Cp (GA, NC, SC), Mt (SC): pond margins, ditches; uncommon (NC
Watch List). July-August. ME south to FL, west to s. MS; disjunct to se. TX. [= RAB, C, FNA, GW, K, S, W, X, Z; > X.
congdonii Small – F; > X. smalliana – F; > X. smalliana var. smalliana – G; > X. smalliana var. olneyi (Wood) Gleason – G]
Xyris stricta Chapman. Cp (GA, NC, SC): depression ponds, depression meadows, borrow pits, ultisol savannas and
ditches; rare. July-September. SC south to n. FL, west to s. MS and se. LA. Reported for our area by Kral (1966b). P.
McMillan (pers. comm.) reports this species from a number of locations in the outer Coastal Plain of NC and SC. [= GW, K, S,
X, Z; = X. stricta var. stricta – FNA]
Xyris tennesseensis Kral, Tennessee Yellow-eyed Grass. Mt (GA): seepy, fenlike areas over limestone; rare (US
Endangered, GA Endangered). TN, AL, and nw. GA (Jones & Coile 1988). See Kral (1978b). [= FNA, K]
Xyris torta J.M. Smith, Mountain Yellow-eyed Grass. Mt, Pd (GA, NC, SC, VA), Cp (SC, VA): mountain bogs, marshes,
ditches; uncommon (SC Rare). June-August. NH west to WI, south to e. VA, e. NC, w. SC, c. GA, LA, OK, and TX. This is
our only species of Xyris not strongly associated with the Coastal Plain. [= RAB, C, FNA, GW, K, S, W, Z; > X. torta var.
macropoda Fernald – F, G; > X. torta var. torta – F, G]
Xyris isoetifolia Kral. Bogs, savannas, and depression pond margins. FL Panhandle and s. AL. [= FNA, GW, K, X, Z]
Xyris longisepala Kral. Depression pond margins. FL Panhandle and s. AL. [= FNA, GW, K, X, Z]
ZANNICHELLIACEAE Dumortier 1829 (Horned Pondweed Family)
A family of 4 genera and about 10-12 species, aquatic herbs, nearly cosmopolitan. Probably better included in the
Potamogetonaceae (Angiosperm Phylogeny Group 2003). References: Haynes & Hellquist in FNA (2000); Haynes & Holm-
Nielsen (1987)=Z; Haynes, Les, & Holm-Nielsen in Kubitzki (1998b).
Zannichellia Linnaeus 1753 (Horned Pondweed)
A genus of about 5 species, aquatic herbs, nearly cosmopolitan. References: Haynes & Hellquist in FNA (2000); Haynes &
Holm-Nielsen (1987)=Z.
Identification notes: Zannichellia is sometimes confused with other aquatics, such as Ruppia and narrow-leaved Potamogeton.
Potamogeton has at least some leaves alternate; Zannichellia and Ruppia are opposite-leaved. Zannichellia lacks the abruptly