FEB. 1903. PLANTS YUCATAN/*: MILLSPAUGH & CHASE. 



6 1 



articulated between the florets. Empty glumes 2, floral glumes mem- 

 brahaceous, 3-nerved, bidentate, cuspidate between the teeth. Grain 

 dorsally compressed, free. Stamens 3. 



Triodia eragrostoides Vasey&Scribn. Contr. U.S. Nat. Herb. 1:58. 

 Panicle finally exserted, loose and open, 15-25 cm. long, 10-12 



-cm. wide, branches distant, slender, ascending or spreading at 



maturity, axis and rachis scabrous, 

 at least above. Spikelets 2. 8 x 5-5.5 

 mm., 7-io-flowered, on slender 

 scabrous pedicels, i to many times 

 their own length; joints of the ra- 

 chilla .4-. 5 mm., short pilose; first 

 glume 1.8 mm., lanceolate, acu- 

 minate, strigose, hispid on the keel; 

 second 2.5 mm., broadly ovate, ab- 

 ruptly acuminate, strigose, hispid 

 on the keel; floral glume 2.22.5 

 mm., truncate or emarginate, cus- 

 pidate, ciliolate at, the apex, stri- 

 gose, pubescent on the margins 

 and nerves below; palea 2 mm., 



ciliolate at the truncate apex, pubescent on the nerves. Grain 



dull brown, oblong-obovate, .9x1.3 mm.; in section reniform. 



Hab. Silam, Gaumer f2jp, "A lax form," F. Lamson- 



Scribner. 



ERAGROSTIS Host. Ic. Gram. 4:14. 



Inflorescence paniculate. Spikelets laterally compressed, few to 

 many flowered, perfect; rachilla articulated above the empty glumes 

 and between the florets, but sometimes not breaking up until after 

 the fall of the fruiting glumes. Empty glumes 2, floral glumes mem- 

 branaceous, 3-nerved, awnless. Grain terete or little compressed 

 laterally, free. Stamens 3. 



Spikelets i6-30-flowered amana. 

 Spikelets not more than lo-flqwered: 



Keels of palea hispid Mexicana. 

 Keels of palea long ciliate: 



Grain smooth and shining, panicle dense, contracted ciliaris. 



Grain longitudinally striate, panicle loose and open plumosa, 



Eragrostis plumosa Link Hort. Berol. 1:192. 



Panicle long exserted, loose and open, 713 cm. long, 25 cm. 

 wide, axis and rachis scabrous at least above; branches ascending or 

 somewhat spreading at maturity. Spikelets 2.5 x 3-3. 5 mm. , loosely 

 8-io flowered, grayish green, on slender pedicels ^ to twice their 

 own length; joints of the rachilla 2 mm. articulated, leaving persistent 



