﻿Nash : Genus Svntherisma in North America 295 



Sandy soil along the coast from Georgia and Florida to 

 Texas ; also in the Indian Territory and Illinois, and probably 

 south along the Mississippi River. 



The much longer and more numerous racemes and the larger 



and comparatively narrower spikelets afford characters sufficiently 

 marked, it is believed, to warrant its maintenance as specifically dis- 

 tinct from 5. filifonuis, to which in some of its forms it is closely 

 related. 



3. Svntherisma leucocoma sp. nov. 



Culms 1 meter or less tall, rather slender, erect, smooth and 

 glabrous ; nodes i or 2 : culm leaves about 2 ; sheaths somewhat 

 compressed, keeled, at least toward the apex, coarsely striate, the 

 lower one densely hirsute with nearly appressed hairs, the upper 

 one much elongated, similarly but sparingly pubescent toward the 

 base only ; ligule a membranous ring 2-3 mm. long, externally 

 somewhat pubescent ; blades erect, flat, often involute when dry, 

 glabrous on the lower surface, on the upper surface rough, as are 

 the margins, and sparingly pubescent at the base, 3 mm. or less 

 broad, those on the culm from 1.5-2.5 dm. long, those on the in- 

 novations 1-4 dm. long, frequently narrower and involute : panicle 

 exserted, the axis 4-6 cm. long, smooth, pilose at the base ; racemes 

 2 ~4. 2-2.5 dm. long, erect or nearly so, alternate, the rachis 

 3-angled, the angles hispidulous and not winged, the base some- 

 times branched, the branches 1.5 cm. or less long : spikelets 2.25- 

 2.5 mm. long, .8 mm. wide, elliptic, acute, on hispidulous 3-angled 

 pedicels, usually in 3's, in pairs toward the summit of the racemes ; 

 outer empty scales white, the first wanting, the second about as 

 long as or a trifle shorter than the flowering scale, 3-nerved, the 



margins and interncrves pubescent with very long erect glandular 

 tipped hairs, the third scale a little longer than the fourth, 7-nervcd, 

 he margins and the first and second internerves on each side 

 pubescent with very long appressed grand ular tipped hairs, the 

 fourth scale brown at maturity, striate, apiculate ; palet of equal 

 length and similar texture. 



High pine land, Florida. Collected apparently only by the 

 writer at Lake Ella, Lake Co., July 3, 1894, no. 1 155. 



4- Svntherisma gracillima (Scribn.). 



Panicum fracillimum Scribn. Bull. Torr. Bot. Club, 23: 146. 

 1896. 



Culms tufted, slender, 6-8 dm. tall, smooth and glabrous, th 

 ln " -ations about one-half as long ; node I, deep brown, 1 dm. 



