FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



a scanous margin. 



Stamens longer than the achene. Style 3-cleft, 



Bristles brown, smooth 

 or minutely denticu- 

 late at the summit, 

 longer than the achene. 

 Achene, including tu- 

 bercle obovoid with ta- 

 pering apex, 1.7x2.8 

 mm. ; tubercle stramin- 

 eous, tipped with 

 black, pyramidal, .8 

 mm. high, i mm. wide 

 at base. Achene 

 proper brown; in sec- 

 tion lenticular - rhom- 

 boidal, the surfaces 

 prominently marked by 



longitudinal rows of laterally elongated hexagonal reticulations. 



Hab. Sisal, Schott sine num.; common, Chichankanab,r<zw;<?r 1447, 



Progreso 2402. 



DICHROMENA Michx. Fl. Bor. Am. 1:37. 



Fertile flowers perfect, glumes numerous, spirally imbricated, 

 the lower and upper empty or infertile, spikelets few-fruited. Peri- 

 anth none. Stamens 2 or 3. Style 2-cleft, its base persistent as a 

 tubercle on the achene. Achene biconvex, transversely wrinkled. 

 Spikelets crowded in a terminal head subtended by long, leaf-like 

 bracts. 



colorata. 



radicans. 



Tubercle truncate at base, head of 8-16 spikelets 

 Tubercle sagittate, head of 1-3 spikelets 



Dichromena colorata (L.) Hitch. PI. Baham. 141. 



Sch&nus coloratus L. 



Dichromena leucocephala Michx. 



Bracts 3-5, deflexed-spreading, 5-10 cm. long, basal portion 

 white. Inflorescence in 

 white, globose heads 10- 

 14 mm. wide, composed 

 of 8-16 ovoid spikelets, 

 3x58 mm., 1-3 -fruited, 

 glumes white with a hyaline 

 border, conoid, subacute, 

 keeled, nearly three times 

 the length of the achene. 

 Stamens 2. Achenes (ex- 

 cluding the beak) dark cin- 

 namon-brown, obovoid, 

 1.2x1.15 mm. Beak 

 broadly -conical, darker 

 than the achene, .5 mm. 

 high. Achene in section lenticular, the angles strongly marked, the 



