FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



with chestnut, strongly 9-11 -nerved. Stamens 3. Style equal to the 

 achene, divided ^ its length. Achene fuscous, obovate-oblong, 

 .7x1.8 mm.; in section triangular, facets convex, the ventral broad- 

 est, the angles with rounded margins; markings of hexagonal ridges, 

 the interspaces convex. 



Hab. Mangrove swamp, Sisal, Nov. 9, 1865, Schott sine num. 



The above description and figure apply only to that form of 

 Cyperus echinatus (Ell.) Wood, with subglobose spikes, umbel of 

 i8 rays, slender culms and small tuber-like corms, not the larger 

 form with ovoid spikes, umbels of 10-13 ravs an< i horizontal root- 

 stocks, and which, under the names Mariscus ovularis Kunth and 

 Cyperus EaldwiniiTortey, are included by authors as synonyms under 

 C. echinatus. The larger " ovularis" form has not been found in 

 Yucatan. 



Cyperus ligularis L. Amoen. Acad., 5:391. 

 Mariscus rufus H. B. K. 

 Mariscus ligularis Urb. 



Bracts 4-7, leaf-like, 3-7 dm. long, minutely sharp serrate. 

 Inflorescence a compound umbel, rays 8-12, 19 cm. long; secondary 



umbels congested, subcorymbose; 

 spikes rufous, sessile or subsessile, 

 the terminal one cylindrical, 2-3 cm. 

 long, i cm. wide, the lateral deflexed, 

 1-2 cm. long. Spikelets reddish- 

 brown, ellipsoid, 1.5x3-5 mm., 

 densely crowded, divergent, 2-4- 

 fruited; rachilla wings small. Glumes 

 reddish-brown with a dull-green mid- 

 rib, ovate, obtuse, striate, keeled, 

 twice the length of the achene. 

 Style longer than the achene, divided 

 to near the base. Achene dull-black when ripe, ellipsoid, .65-.7X 1.4 

 mm., in section sagittate triangular, the dorsal angle sharpest, dorsal 

 facets slightly concave, the ventral deeply so; all marked by faint 

 irregular hexagonal ridges, the interspaces plane and centrally occu- 

 pied by large and prominent semi-globular papillae. 



Hab. Abundant, 3 feet high, San Felipe, Gaunter 1401. 



Cyperus bruneus Sw. Fl. Ind. Occ., 1:116. 



Mariscus bruneus Clarke. 



Bracts 4, leaf-like, .5-2.5 dm. long. Inflorescence a dense 

 umbel, 1.5-4 cm - wide, formed of 2-6 spikes, rays i cm. long. Spikes 

 crimson-lake turning darker with age, subglobose, 14 mm. wide; 

 spikelets about 20, oblong, compressed, divergent, 2x6 mm., 5-7- 

 fruited. Glumes with bright-green keel, crimson-lake turning to dull 

 rusty-brown faintly spotted with red, broadly ovate, obtuse, apiculate v 



