FEB. 1903. PLANTVE YUCATAN.*: MILLSPAUGH & CHASE. 



49 



SPOROBOLUS R. Br. Prod. 1:169. 



Inflorescence paniculate; spikelets i-flowered, perfect, rachilla 

 articulated above the empty glumes, not produced beyond the flower. 

 Glumes 3, all thin or membranaceous, rounded on the back or slightly 

 keeled, i-nerved, awnless, the two outer ones empty. Grain laterally 

 compressed, free, the pericarp loosely enclosing the seed, or very 

 thin and evanescent. Stamens 3. 



First glume less than YT, the length of spikelet: 



Spikelet 2 mm., palea emarginate, splitting at maturity Domingensis. 



Spikelet 1.3 mm., palea obtuse, not splitting . minutiflorus. 



First glume ^ the length .of spikelet Virginicus. 



Sporobolus Virginicus (L.) Kunth Rev. Gram. 1:67. 

 Agrostis Virginica L. 

 Panicle usually included at the base, contracted, dense, 4-7 cm. 



long, 5-7 mm. wide; axis and rachis minutely scabrous. Spikelets 



.6-.8x2.5-2.8 mm., pale green, glabrous, 

 on slender scabrous pedicels. First and 

 second glumes ovate, acute, the first 2 mm., 

 the second 2.5 mm. long; floral glume 

 equal to second, ovate, subacute, minutely 

 hispidulous on the nerve above; palea equal 

 in length, ovate, acute, folded in from the 

 back between the two nerves. Grain 

 amber brown, obovoid, .4-.6x.g mm.; in 

 section ovate-oblong with the ventrum 

 slightly concave. The very thin pericarp 

 indistinguishable in the dried state. 



Hab. Covering the south end of 

 Perez Island (Millspaugh PL Utowance 

 I 75>} Pajaros Island, and a small patch 



on the west end of Allison and Chica Islands, Alacran Shoal, March 



8, 1899; San Anselmo, Gaumer 2481. 



Sporobolus minutiflorus (Trin.) Link 

 Hort. Berol. 1:88. 



Vilfa minutiflorus Trin. 



Panicle short-exserted, elongated, 1230 

 cm. long, 2.5-7 cm - wide, axis and rachis 

 glabrous, branches alternate, spreading. 

 Spikelets .5x1.3 mm., brownish, glabrous, 

 on short, slender pedicels. First and sec- 

 ond glumes lanceolate-ovate, the first .4 

 mm., obtuse, the second .6 mm., subacute; 

 floral glume i mm., ovate, subacute; palea 

 equal in length, obtuse, not infolded nor 

 splitting between the two nerves. Grain 

 reddish brown, oblong, .2-. 5x1 mm.; in 

 section oval, with concave ventrum. Peri- 

 carp very thin, loose 



Hab. Izamal, Sept., Gaumer 891, 2328, 2491, Chichankanab/259, 

 1285. 



