North American Cyperacece. S61 



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 Rhynchosporeas. 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 was not dis- 

 eased. 



2. PsiLOCARYA RHYNCHOSPOROIDES. 



Spikes ovate, S — 10-flowered; scales membranaceous, 

 roundish-ovate; nut lenticular, suborbicular, strongly rugose 

 transversely; tubercle distinct, short, dilated, obtuse. 



Culm about a foot high. Leaves two Hnes broad, overtopping the 

 culm. Cyme 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. 

 Chapman ! 



Obs. This species is very distinct from the last, although 

 entirely similar in habit, 



3. PsiLOCARYA TEXE^'^SIS, Torr. ^ HooJc, 



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 axillary and 

 terminal ; the terminal one decompound. Primary rays about five, 

 3 — 4 inches long, nearly erect, with long foliaceous bracts at the base, 

 sexniterete ; ultimate divisions bearing 2 — 3 approximated spikes. Spikes 



