﻿294 Nash : Genus Syxtherisma ix North America 



blades 3-20 cm. long, 1-4 mm. wide, flat, erect, usually glabrous 

 on the lower surface, excepting sometimes in the lowermost leaves, 

 the upper surface, as well as the margins, rough, papillose-hirsute 

 at the base, and sometimes sparingly so a little further up : pani- 

 cle long-exserted, the axis 1-3 cm. long, smooth and glabrous ; 

 racemes 2-5, 2-10 cm. long, erect or ascending, alternate, the 



rachis 3-angled, the angles hispidulous and not winged : spikelets 

 about 1.8 mm. long, .75 mm. wide, elliptic, acute, on hispidulous 

 3-angled pedicels, in pairs ; outer empty scales white or purplish, 

 the first scale wanting, the second 'three-fourths to seven-eighth 

 as long as the spikelet, 3 -nerved, the margins and the internerves 

 pubescent with long appressed glandular tipped hairs, the third 

 scale slightly shorter than the fourth, 7-nerved, the margins and 

 the first and second internerves on each side pubescent with long 

 appressed glandular tipped hairs, the fourth scale deep chestnut 

 brown at maturity, striate, obtusely apiculate ; palet of equal 

 length and similar texture. 



Dry sandy soil, Massachusetts to Michigan, south to Dela- 



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ware, North Carolina and the Indian Territory. 



2. Syxtherisma viixosa Walt. IT. Car. jj. 1788. 



Culms densely tufted, 6-14 dm. tall, slender, erect, simple or 

 somewhat branched, smooth or glabrous ; nodes 3-5 : culm leaves 

 3-5 ; sheaths flattened, keeled, at least toward the apex, the lower 

 densely papillose-hirsute, the uppermost one sparingly so or gla- 

 brous ; ligule an irregularly toothed scarious ring 1-2 mm. Ion 

 blades .7-2.5 dm. long, 3-6 mm. wide, flat, erect or nearly so, 

 smooth beneath, rough above, the lower more or less papillose- 

 hirsute, particularly on the upper surface near the base, the upper 

 leaves glabrous : panicle long-exserted, the axis 3-9 cm. long, 

 usually exceeding 5 cm., smooth and glabrous ; racemes 2-8, com- 

 monly more than 5, 4-20 cm. long, generally 12-15 cm., erect °' 

 ascending, rarely spreading, alternate, the rachis triangular, the 

 angles hispidulous and not winged : spikelets 2.5 mm. long, about 

 .8 mm. wide, elliptic, acute, on 3-angled sparingly hispidulous ped- 

 icels, usually in 3's, in pairs toward the apex of the racemes ; 

 first scale wanting, the second and third scales pubescent with long 

 appressed glandular tipped hairs, the second scale 3 -nerved, a 

 little shorter than the third, the pubescence on the margins and in- 

 ternerves, the third scale slightly shorter than the fourth, 7-nerved, 

 the pubescence on the margins and on the second and usually also 

 the first internerves on each side, the fourth scale deep chestnut 

 brown when mature, elliptic to elliptic-lanceolate, striate, apiculate ; 

 palet of equal length and similar texture. 



