Milium. CLXI. GRAMINE^. 603 



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

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

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

 spikekts 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. L^VE (and precox. Michx.) 



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

 Dnly 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 

 roM-s ; rachis flexuous, flat on the back ; pedicels undivided, with one spikelet ; 

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

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



3. P. STOLONIFERUM. BOSC. 



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

 branched ; Ics. 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. Jul)'-, 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 palese ; caryopsis striate. 



1. D. sANGUiNALis. Scop. (Pauicum sanguinale. Linn.) Purple Finger 

 Grass. Crab Grass. — Sis. 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, 5 — 9 together ; spikelets in pairs, oblong-lanceolate, closely appressed 

 to the flexuous rachis, in 2 rows. — Q Common in cultivated grounds, JN'. 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 ; 

 glmm equaling the abortive flower, both hairy. — Q) Sandy fields, N. Y., Penn. 

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



3. D. sEROTlNA. Michx. (D. villosa. Ell.) 



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, ver)' pubescent with long hairs ; spikes numerous, setaceous, 2 — 3' long ; 

 spikelets all pedicellate; lower glume veiy minute, the margin ciliate. — Q) N. Y. 



4. D. FiLiFORMis. Ell. (Panicum. Willd.) 



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

 lanceolate ; lawer sheaths very hairy, -upper glabrous; 'spikes 2 — '1, filiform, erect ; 

 ?-«cAt5 flexuous ; spikelets in 3s, all pedicellate; glume so\ita.Ty, as long as the 

 abortive flower. — (i) Dry, gravely soils, N. Y. to Ky. Aug. 



19. MILIUM. 



Celtic 7nil, a pebble ; alluding to its hard, turgid fniit. 



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

 involucre or awns ; palefe 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, difiuse panicle; 

 Ivs. flat, 8 — 12' by *^1', on smooth, striate sheaths; branelies of the panicle clus< 

 51* 



