North American Cyperacece. 261 
vegetable productions of Massachusetts. In the form and 
structure of its spikes it resembles a Scirpus, but it differs from 
any of the Scirpeae in habit, and is undoubtedly nearly related 
to the Rhynchosporeae. The flowers are frequently affected 
with a species of Uredo, insomuch that during one season Mr. 
Greene was unable to find a single specimen that wa? not dis- 
eased. 
2. PSILOCARYA RHYXCHOSPOROIDES. 
Spikes ovate, 8 — 10-flowered; scales membranaceous, 
roundish-ovate; nut lenticular, suborbicular, strongly rugose 
transversely; tubercle distinct, short, dilated, obtuse. 
Culm about a foot high. Leaves two lines broad, overtopping the 
culm. C_!/7/ie few-flowered. Spikes 2 — 3 lines long, all of them pedun- 
culate. Scales pale brown, one-nerved, mostly very obtuse. Nut a 
little convex on each side, whitish, margined. Tubercle gray, somewhat 
2-lobed at the base, but not decurrent on the sides of the nut. Style 
separating at the summit of the tubercle. 
Hab. Quincy, Gadsden County, Middle Florida, Dr. 
Chapmon ! 
Obs. This species is very distinct from the last, although 
entirely similar in habit. 
3. Psilgcarya Texensis, Torr. ^ Hook. 
Cymes decompound ; spikes ovate, acute, many-flowered ; 
scales roundish-ovate, rather acute and mucronulate, some- 
what coriaceous, with a prominent midrib ; nut suborbicular, 
lenticular, strongly rugose transversely ; tubercle distinct, short, 
dilated, very obtuse. 
Culm 2 feet high, obtusely triangular. Leaves shorter than the culm, 
about 2 lines long, slightly scabrous on the margin. Cymes axillar\' and 
terminal ; the terminal one decompound. Primary' rays about five, 
3 — 4 inches long, nearly erect, with long foliaceous bracts at the base, 
•emiterete ; ultimate divisions bearing 2 — 3 approximated spikes. Spiket 
