Muuium. -CLXI. GRAMINEZ. 603 
very remote joints; dvs. 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; 
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.toKy. Aug. 
2. P. Lzve (and precox. Miche.) 
St. erect, rather firm, 18’/—3f high, glabrous ; lws. generally smooth, pilose 
only 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 (13” diam.) as in the preceding; glumes orbicular-ovate, 
1-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 ; dvs. 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. DIGITARIA. 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 pales ; caryopsis striate. 
1. D. saneurnAtis. Scop. (Panicum sanguinale. Linn.) Purple Finger 
Grass. _ Crab Grass.—Sis. decumbent at base, radiating and branching at 
the lower joints, 1—2f long ; dvs. 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; spkelets 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. cuaBra. Roem. & Schultz. (Panicum. Jand.) 
St. generally decumbent, rarely rooting at the joints, a foot long; Jvs. 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. serorina. Michx. (D. villosa. Ei.) 
Rt. creeping; st. decumbent, 12—18’ long, terete, hairy at the joints, form- 
ing a dense carpet where it grows; Js. linear-lanceolate, thin, and with the 
sheaths, very pubescent with long hairs; spikes numerous, setaceous, 2—3’ long; 
spikelets all pedicellate; lower glwme very minute, the margin ciliate——@ N. Y. 
4. D. rinirormis. Ell. (Panicum. Willd.) 
St. erect, filiform, simple, 12—18’ high ; ws. short, nearly smooth, narrow- 
lanceolate ; lower sheaths very hairy, upper glabrous; spikes 2-4, 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 ; palez 2, shorter than the glumes, awnless, ob- 
long, concave, persistent and cartilaginous, coating the caryopsis. 
1. M. errusum. Spreading Millet Grass. , 
St. erect, simple, smooth, 5—8f high, bearing a compound, diffuse panicle; 
lws. flat, 8—12’ by 4—1’, on smooth, striate sheaths ; branches of the panicle clus- 
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