74 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



kanab, 2146, 2421; borders of the lagoon south of Progreso, March 5, 

 1899, Millspaugh PI. Utowance 1671 (Cyperus densiflorus Field Col. 

 Mus. Bot. 2:28), in deep woods at Chichen Itza, 1637, T 773 (Cyperus 

 densiflorus ibid.). 



Cyperus lentiginosus sp. nov. 



Bracts 6-10, leaf-like, 5-45 cm. long, 2-10 mm. wide, under a lens 

 spotted with dark purple, scabrous on the upper surface and margins 

 at least toward the summit, smooth below. Inflorescence a 10-16- 

 rayed umbel, i or 2 spikes subsessile, rays 2-12 cm. (rarely to 20 

 cm.) long, often compound, when the secondary rachis extends at 

 right angles to the primary one. Spikes russet brown or green, 

 oblong, 2-2.5 cm. wide of 30-75 pectinate spikelets; rachis 1.5-4 cm - 

 long, bractlets linear or setaceous. Spikelets little compressed, lin- 

 ear lanceolate, 1.3-2x10-13 mm., 4-6-fruited; rachilla wings mem- 

 branaceous, clasping the achene nearly its entire length, pale, spotted 

 with purple; rachilla joints 1.3 mm. long. Glumes more than twice 

 the length of the achene, lanceolate-ovate, short mucronate, 9-11- 

 nerved, golden brown with a green keel and conspicuously spotted 

 with dark purple, appressed or somewhat spreading at the tips. 

 Stamens 3. Style longer than the achene, divided y$ its length. 

 Achene brown, obovate-oblong, .6-.J x 1.82 mm. ; in section triangular, 

 facets concave, surface marked by faint hexagonal ridges, the inter- 

 spaces occupied each by a shallow circular pit with a prominent lip. 

 Plant 3-8 dm. high, culms erect from a short rootstock, sharply 

 3-angled, glabrous; sheaths scarious, thickly spotted with chestnut or 

 purple. Leaves equaling or exceeding the culm, .51 cm. wide, flat, 

 scabrous on the upper surface and margins toward the summit. 



Hab. Merida, July 2, 1865, Schott 565 ; common in moist shady 

 places, Chichankanab, Gaumer 1282, 1283, 1284, 1286, 1287, 1290, 

 (the type, Herb. Field Col. Mus. No. 57219,) 1296, '2145, 2331, San 

 Felipe 1402, Izamel 248"]. 



No. 433 Ad. Tonduz, Flora Costaricensis, July, 1892, is a small 

 and immature specimen of this species. 



Cyperus Michauxianus Schultes Syst. Mant., 2:123. 



Cyperus speciosus Vahl? 



Torulinium Michauxianum Clarke. 



Bracts leaf-like, 5-12 cm. long. 

 umbel, 15-20 cm. wide; primary 

 rays 8-10, i n cm. long; secon- 

 dary rays 1-6 cm. long. Spikes ob- 

 long in outline, 1.5-2.5x3-4 cm., 

 composed of 30-50 horizontally 

 spreading spikelets. Spikelets 

 brown, but little compressed, 

 i.5.xio 12 mm., 10-12 -fruited; 

 rachilla wings smaller, en- 

 folding the lower half of the 

 achene. Glumes loose, obliquely 

 spreading, slightly imbricated, 

 reddish-brown with a broad, green, minutely striate dorsal stripe; 



Inflorescence a compound 



