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5151 �C Perianth bristles antrorsely barbellate 6 6 Surface of achene smooth, minutely pitted, or finely striate 7 �C Surface of achene transversely ridged, rugose, or honeycomb-reticulate 8 7 Bristles > 1?2 as long or exceeding the achene body; larger basal leaves 1.3?2.5 mm wide, achene elliptic, 1.1?1.3 mm wide, tubercle triangular?attenuate Rhynchospora distans Fig. ?Fig.5353 �C Bristles virtually non-existent to 1?2 as long as the achene body (rarely > 1?2 as long as the achene body); larger basal leaves 2?4 mm wide; achene suborbicular, 1.2?1.5 CYTH4 mm wide, tubercle triangular [Rhynchospora fascicularis] 8 Achenes biconvex, not flat or concave on one side Rhynchospora nitens Fig. ?Fig.5858 �C Achene faces flat or concave, when one face is concave, the other slightly convex 9 9 Achene click here at least 2�� as long as wide, elliptic?oblong, tubercle subulate, 0.8?1.2 mm long Rhynchospora inexpansa Fig. ?Fig.5454 View it in a separate window Key adapted from Kral (2002a) and Weakley (2012). Note: A voucher (Wilbur 49814, DUKE) for Rhynchospora fascicularis (Michx.) Vahl was collected from the shoreline of Lake Waccamaw; however, this specimen appears referable to R. distans (Michx.) Vahl. Nonetheless, though not otherwise reported from the littoral zone of Carolina bay lakes, R. fascicularis has the potential to occur in these sites and is therefore included in the key below. Achene measurements in this key do not include the tubercle (i.e., the tubercle and achene should be measured as two separate entities). Eriocaulaceae 1 Plant 4?21 cm tall (?100 cm when submersed); receptacle/base of flowers glabrous or sparingly hairy; heads overall appearing dark gray to white, 4?10 mm in diam. when in full flower and fruit; seeds light-brown or red-brown, ovoid to broadly ellipsoid, faintly reticulate, not papillate; Selleckchem KU 55933 of sandy to peaty shorelines, bogs, and streams Eriocaulon aquaticum Fig. ?Fig.6060 �C Plant 20?70 cm tall; receptacle/base of flowers copiously hairy; heads overall appearing white, 10?20 mm in diam. when in full flower or fruit; seeds dark lustrous brown, broadly ovoid to round but asymmetric, minutely spiny papillate; of seasonally floooded depression ponds, savannas, flatwoods, ditches [Eriocaulon compressum] View it in a separate window Key adapted from Kral (2000a) and Weakley (2012). Note: Although the first author has only encountered E. aquaticum in the field, E. compressum was reported from the NCSU Crop Science Department (Rob Richardson and Justin Nawrocki, pers. comm., April 9, 2015) and is therefore included in the key below. Hydrocharitaceae 1 Leaves noticeably rough to the touch, in whorls of (3?) 4?8, 1.