Milium, CLXI. GRAMINEtE. 603 



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

 pubescent, uppor one very Um*^; api/cc generally solitary, often 2, on a lon^, 

 very slender peduncle, sometimes with another scarcely cxserted I'rom the sheaths; 

 spikelcfs plano-convex, with the Hat side out, }" diam., about 2 on each very 

 short pedicel, appearins^ 2 — 3-ro\ved in the 1-sided spike. — Dry fields, Mass.! to 

 Car. W. to Ky. Aug. 



2. P. i.jKvk (and precox. Mirhx.) 



St. erect, rather firm, 18' — 31' high, glabrous; Ivs. generally smooth, pilose 

 only at the base, broailly linear; lower sheaths sometimes hairy; sjrikcs 2 — 6, 

 alternate, sprcailing, with a Jew long, white hairs at the base; spikcUts in 2 

 rows; rrtrA/.s- tlcxuous, flat on the back ; pedicels undivided, with one spikelet; 

 spikclets twice as large {\\" diam.) as in the preceding; illumes orbicular-ovate, 

 1-veined. — Gras.sy banks of rivers, Pcnn. to Ky. and Ga. Aug. 



3. P. STOI.ONIFERIM. Bosc. 



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

 branched; Ivs. short, subcordate ; spikcsYcvy numerous (30 — 50),subverticillate, 

 spreading, in elongated, terminal and lateral racemes; common rachis 4 — W 

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

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



18. DIGITARIA. Haller. 



Laf. digitii^s, a fiiife'cr; alluding to ttie 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 5 , with 2 cartilaginous, 

 subequal palece ; caryopsis striate. 



1. D. sANGUiNALis. Scop. (Panicum sanguinale. Linn.) Purple Pinger 

 Grass. Crab Grass. — Sis. decumbent at base, radiating and branching at 



the lower joints, 1 — 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 ; spikclets "in pairs, oblong-lanceolate, closely appressed 

 to the flexuous rachis, in 2 rows. — Common in cultivated grounds, N. Eng., 

 W. Ind.! Aug.— Oct. 



2. D. cr.ABRA. 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; 

 gluvie equaling the abortive flower, both hairy. — ® Sandy fields, N. Y., Penn. 

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



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



Rt. creeping; si. 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 slume very minute, the margin ciliate. — N. Y. 



4. D. FitjroRMis. Ell. (Panicum. Wilhl.) 



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

 lanceolate ; hnver sJieaths very hairy, vppcr glabrous ; spikes 2-^, filiform, erect ; 

 r«icAw flexuous ; spikelets in 3s, all pedicellate; o-/?;;^^ solitary, as long as the 

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



19. MILIUM. 



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



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

 involucre or awns : palea3 2, shorter than the glumes, awnless, ob- 

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

 1. M. EFFirsuM. Spreading; Millet Gra.<is. 



St. erect, simple, smooth, 5— 8f high, bearing a compound, difll'use panicle ; 

 Ivs. flat, 8 — 12' bv h — 1'> on smooth, striate sheaths ; branches of the panicle clus- 

 ' 51* 



