620 GRAMINE^E. (GRASS FAMILY). 



(Trachynotia polystachya, Michx. Dactylis cynosuroides, L.l in part, excl. 

 var. ) — Salt or brackish marshes, within tide-water, especially southward. 



3. S. jlincea, Willd. (Rush Salt-Grass.) Culms low (1°- 2° high) and 

 slender; leaves narrow and rush-like, strongly involute, very smooth; spikes 1-5, on 

 very short peduncles ; the rhachis smooth ; glumes acute, the lower scarcely half 

 the length of the upper, not half the length of the lower palet. (Dactylis pa- 

 tens, Ait.) — Salt marshes and sea-beaches. Aug. (Eu.) 



* * Spikelets loosely imbricated, or somewhat remote and alternate, the keels only slightly 

 hairy or roughish under a lens: spikes sessile and erect, soft: leaves, rhachis, Sfc. 

 very smooth : culm rather succulent. 



4. S. Stricta, Roth. (Salt Marsh-Grass.) Culm l°-4° high, leafy 

 to the top ; leaves soon convolute, narrow ; spikes few (2-4), the rhachis slightly 

 projecting at the summit beyond the crowded or imbricated spikelets : glumes 

 acute, very unequal, the larger 1-nerved, a little longer than the palets. — Salt 

 marshes, Pennsylvania, &c. (Muhl.) — Odor strong and rancid. (Eu.) 



Var. glabra. (S. glabra, Muhl., partly.) Culm and leaves longer ; spikes 

 5- 12 (2' -3' long) ; spikelets imbricate-crowded. — Common on the coast. 



Var. alternifl6ra. (S. alterniflora, Loisel. Dactylis cynosuroides, var., 

 L.) Spikes more slender (3' -5' long), and the spikelets remotish, barely over- 

 lapping, the rhachis continued into a more conspicuous bract-like appendage : 

 larger glume indistinctly 5-nerved (not so evidently as in the European and 

 Tropical American plant) : otherwise as in the preceding form, into which it 

 passes. — Common with the last : also Onondaga Lake, J. A. Paine. 



18. CTENIUM, Panzer. Toothache-Grass. (PI. 9.) 



Spikelets densely imbricated in two rows on one side of the flat curved rhachis 

 of the solitary terminal spike. Glumes persistent : the lower one (interior) much 

 smaller ; the other concave below, bearing a stout recurved awn, like a horn, on 

 the middle of the back. Flowers 4-6, all but one neutral ; the one or two lower 

 consisting of empty awned palets : the one or two uppermost of empty awnless 

 palets : the perfect flower intermediate in position ; its palets membranaceous, 

 the lower awned or mucronate below the apex and densely ciliate towards the 

 base, 3-nerved. Squamula: 2. Stamens 3. Stigmas plumose. (Name Kreviov, 

 a small comb, from the pectinate appearance of the spike.) 



1. C. Amerieanum, Spreng. Culm (3° -4° high from a perennial root) 

 simple, pubescent or roughish ; larger glume warty-glandular outside and con- 

 spicuously awned. (Monocera aroniatica, Ell.) — Wet pine barrens, S. Virginia 

 and southward. — Taste very pungent. 



19. BOUTELOUA, Lagasca (1305). Muskit-Grass. (PI. 9.) 



Spikelets crowded and closely sessile in 2 rows on oue side of a flattened 

 rhachis, comprising one perfect flower below and one or more sterile (mostly 

 neutral) <>r rudimentary flowers. Glumes convex-keeled, the lower one shorter. 

 Perfect flower with the 3-ncrved lower palet 3-toothed or cleft at the apex, the 

 2-nerved upper palet 2-toothed ; the teeth, at least of the former, pointed or sub- 



