OF ARTS AND SCIENCES. 171 



Eleocharis acicularis, R. Brown. At San Luis Potosi (574 

 Scliaffiier); 914 Parry & Palmer. 



DiCROMEXA LEUCOCEPUALA, Miclix. At Sutherland Springs, 



Texas (1329). 



F1MBRISTYL13 ADTUMNALis, Roem. & Schult. At same locality 



(1327). 



FiiiBRiSTYLis CAPiLLARis, Gray. At San Luis Potosi (557 Schaff- 

 ner) ; 915, 916 Parry & Palmer. 



FiMBRisTYLis ? Apparently undescribed. Culm flattened, 



6 inches high or more, rough-edged above : leaves very rough on the 

 marcrin, 1 or 2 lines wide : spikelets somewhat clustered in a loose 

 compound umbel, narrow and rather few-flowered, 2 or 3 lines long ; 

 scales brown : nutlet triquetrous, white, smooth. — In the San Migue- 

 lito Mountains (558 Scha£fner). 



SciRPDS SUPINUS, Linn. At Penasco, San Luis Potosi (571 

 Schaffner). 



SciRPUS ? Very near S. riparius, Spreng. (S. pygmoeus. 



Gray), but the nutlets somewhat rugulose transversely. At San 

 Luis Potosi (572 Schaffiier). 



SciRPUS HETEROCARPUS. Roots fibrous : culms and leaves filiform, 

 1 to 3 inches long: spikes narrow, 2 to 4 lines long, solitary and naked 

 upon the culm, and also sessile at the base of the leaves ; basal spikes 

 few-flowered, or flowers sometimes solitary in the axils of the leaves : 

 scales of the terminal spike lanceolate, acuminate, chestnut-colored, 

 the lowest often elongated and bract-like, the upper ones sterile and 

 mostly only staminate : stamens 2 ; bristles none : style trifid ; nutlet 

 triangular-obovate, with a short blunt beak, white, obscurely rugulose, 

 those in the basal spikes very much larger (^ line long or more). — 

 At Penasco, San Luis Potosi (573 Schaflfner), and collected also at 

 Orizaba by Botteri (778 in herb. Gray). A very curious species, re- 

 markable for the numerous basal spikes, which seem to be a constant 

 characteristic, the dimorphous nutlets, and the partially staminate ter- 

 minal spikes. 



FuiRENA SQUARROSA, Michx. At Sutherland Springs, Texas 

 (1335), and at Monclova, Coahuila (1336). — Also var. pumila, 

 Torr., at San Rafael, San Luis Potosi (567 Schaffner). 



Hemicarpiia subsquarrosa, Nees. At San Luis Potosi (570 

 Schaffner). 



Rhynchospora ? Perhaps a reduced form of R. Schaff'neri, 



Boeckl. In the San Rafael Mountains (548 Schaffner); 918 Parry 

 & Palmer. 



