5. Rhynchospora harveyi W. Boott (Harvey’s
Pl. 79 c, d; Map 303
Plants tufted. Aerial
stems 25–65 cm long. Leaves basal and progressively reduced on the aerial
stems, the leaf blade 4–25 cm long, 2.0–3.5 mm wide, flat.
Inflorescences of 1–4 clusters of spikelets, mostly terminal, sometimes 1–2
axillary inflorescences also present. Spikelets 2.5–3.0 mm long, ovate to
broadly elliptic in outline, mostly rounded at the tip, with 1(2) of the
florets fertile. Spikelet scales 1.8–2.1 mm long, ovate to broadly
elliptic with the midrib extended past the rounded tip as a curved, slender
awn, brown. Perianth bristles 5–6, delicate and easily shed, much shorter
than to about as long as the fruits, usually with inconspicuous, upwardly
pointing barbs. Fruits with the tubercle 0.3–0.5 mm long, broadly triangular
or depressed-conical with a distinctive raised basal margin, the main body
1.5–1.8 mm long, broadly ovate to broadly elliptic in outline, relatively
turgid, the surface appearing honeycombed with a fine network of ridges and
pits that are longer than to about as long as wide, reddish brown to black.
Uncommon in the southwestern quarter of Missouri, mostly in the Unglaciated Plains Division; also introduced in Dunklin County (southeastern U.S. west to Texas and Missouri). Sandstone and dolomite glades
and moist areas of upland prairies.