MIMUM. CLXI. GRAMINE^E. 603 



very remote joints ; Ivs. lance-linear, 3 7' by 2 3", ciliate and hairy ; sheath* 

 pubescent, upper one very long ; spike generally solitary, often 2, on a long, 

 very slender peduncle, sometimes with another scarcely exserted from the sheaths ; 

 spikelets plano-convex, with the flat side out, \" diam., about 2 on each very 

 short pedicel, appearing 2 3-rowed in the 1-sided spike. Dry fields, Mass. ! to 

 Car. W. to Ky. Aug. 



2. P. LJEVE (and precox. Michx.) 



St.- erect, rather firm, 18' 3f high, glabrous ; Ivs. generally smooth, pilose 

 ?nly at the base, broadly linear; lower sheaths sometimes hairy; spikes 2 6, 

 alternate, spreading, with a few long, white hairs at the base ; spikelets in 2 

 rows ; rachis flexuous, flat on the back ; pedicels undivided, with one spikelet ; 

 spikelets twice as large (1J" diam.) as in the preceding; glumes orbicular-ovate, 

 1-veined. Grassy banks of rivers, Penn. to Ky. and Ga. Aug. 



3. P. STOLONIFEBUM. BOSC. 



St. about 2f long, procumbent at base, geniculate, stoloniferous and 

 branched ; Ivs. short, subcordate ; spikes very numerous (30 50), subverticillate, 

 spreading, in elongated, terminal and lateral racemes; common rachis 4 5' 

 long, angular, smooth, partial ones 3 15" long ; spikelets ovate, alternate. Ce- 

 dar swamps, N. J., Pursh. July, Aug. 



18. DIGIT ARIA. Haller. 



Lat. digitus, a finger; alluding to the digitate form of the inflorescence. 



Inflorescence digitate or fasciculate ; spikes linear, unilateral ; 

 spikelets in pairs, on short, bifid pedicels, 2-flowered ; glumes 2, the 

 lower very small, sometimes wanting ; lower flower abortive, with a 

 single, membranaceous palea ; upper flower $ , with 2 cartilaginous, 

 subequal paleae ; caryopsis striate. 



1. D. SANGUINALIS. Scop. (Panicum sanguinale. Linn.') Purple Finger 

 Grass. Crab Grass. Sts. decumbent at base, radiating and branching at 



ihe lower joints, ] 2f long; Ivs. linear-lanceolate, on long, loose sheaths, softly 

 .pilose, the sheaths strigosely hairy ; spikes 3 5' long, fasciculate at the top of 

 the stem, 59 together ; spikelets in pairs, oblong-lanceolate, closely appressed 

 to the flexuous rachis, in 2 rows. (J) Common in cultivated grounds, N. Eng., 

 W. Ind.! Aug. Oct. 



2. D. GLABRA. Roem. & Schultz. (Panicum. Jand.} 



St. generally decumbent, rarely rooting at the joints, a foot long; Ivs. short, 

 flat, nearly glabrous ; spikes digitate, spreading, 3 4 ; spikelets crowded, ovoid ; 

 glume equaling the abortive flower, both hairy. (D Sandy fields, N. Y., Penn. 

 to Ohio ! Spikes rather more slender than in the foregoing. 



3. D. SEROT1NA. Michx. (D. villosa. Ett.) 



Rt. creeping; st. decumbent, 12 18' long, terete, hairy at the joints, form- 

 ing a dense carpet where it grows ; Ivs. linear-lanceolate, thin, and with the 

 sheaths, very pubescent with long hairs; spikes numerous, setaceous, 2 3' long; 

 spikelets all pedicellate ; lower glume very minute, the margin ciliate. N. Y. 



4. D. FILIFORMIS. Ell. (Panicum. WiUd.) 



St. erect, filiform, simple, 12 18' high ; Ivs. short, nearly smooth, narrow- 

 laK^eolate ; lower sheaths very hairy, upper glabrous ; spikes 24, filiform, erect ; 

 rachis flexuous ; spikelets in 3s, all pedicellate; glume solitary, as long as the 

 abortive flower. Dry, gravely soils, N. Y. to Ky. Aug. 



19. MILIUM. 



Celtic mil, a pebble ; alluding to its hard, turgid fruit 



Inflorescence paniculate ; spikelets 1 -flowered ; glumes 2, without 

 involucre or awns ; palese 2, shorter than the glumes, awnless, ob- 

 long, concave, persistent and cartilaginous, coating the caryopsis. 



1. M. EFFUSUM. Spreading Millet Grass. 



St. erect, simple, smooth, 5 8f high, bearing a compound, diffuse panicle ; 

 Ivs. flat, 8 12' by J 1', on smooth, striate sheaths ; branches of the panicle clus. 



