Part 2, 1912] POACEAE 151 
glandular-tipped hairs, the second 3-nerved, the third 7-nerved, the fruiting scale deep chestnut- 
brown when mature, elliptic to elliptic-lanceolate, striate, apiculate. 
TYPE LOCALITY: South Carolina. 
DISTRIBUTION : Virginia to Missouri, and es to Florida and Mexico ; Cuba, 
ILLUSTRATION: Ell. Bot. S. C. & Ga. pL7,f. 4 
3. Syntherisma leucocomum Nash, Bull. Torrey Club 25: 295. Je 1898. 
Panicum phaeothrix Scrib. Bull. U. S. Dep. Agr. Agrost. 7: 58. 1898. Not P. phacothrix Trin. 1827. 
Panicum leucocomum Scribn. Bull. U. S. Dep. Agr. Agrost.7: ed. 2. 58. J1 1898. 
Stems 1 m. or less. tall, rather slender, erect; leaf-sheaths somewhat compressed, keeled, 
. at least toward the apex, coarsely striate, the lower densely hirsute with nearly appressed hairs; 
blades erect, flat, often involute when dry, glabrous on thé lower surface, on the upper surface 
rough and sparingly pubescent at the base, 3 mm. or less broad, those on the stem 1.5—-2.5 dm. 
long, those on the innovations 1-4 dm. long; panicle exserted, the axis 4-6 cm. long; racemes 
2-4, 2-2.5 dm. long, erect or nearly so, the rachis 3-angled; spikelets 2.25-2.5 mm. long, elliptic, 
acute, on hispidulous 3-angled pedicels, usually in 3’s, the first scale wanting, the second and 
third scales white, pubescent with long glandular-tipped hairs, the second 3-nerved, the third 
7-nerved, the fruiting scale brown at maturity, striate, apiculate. 
TYPE LOCALITY: High pine land, Lake Ella, Florida, 
DISTRIBUTION: Florida and Cuba. 
ILLUSTRATION: Bull. U. S. Dep. Agr. Agrost.7: f. 40. 
4. Syntherisma gracillimum (Scribn.) Nash, Bull. Torrey 
Club 25: 295. 1898. 
Panicum'gracillimum Scribn. Bull. Torrey Club 23: 146. 1896. 
Stems tufted, slender, 6~8 dm. tall; leaf-sheaths loosely embracing the stem, the lower, 
as well as those on the innovations, somewhat hirsute with ascending-appressed hairs; blades 
2 mm. wide or less, smooth on the lower surface, rough on the upper and more or less hairy 
at the very base, those on the innovations 3-4 dm. long, those on the stem 1.5 dm. or less; 
panicle long-exserted, the axis 3-6 cm. long; racemes 2, or rarely 3, about 3 dm. long, erect, 
the rachis 3-angled; spikelets slightly exceeding 2 mm. long, elliptic, acute, in 2’s—4’s, irregu- 
larly scattered, on hispidulous 3-angled pedicels, the first scale wanting, the second and third 
scales glabrous, white, the second 3-nerved, half as long as the spikelet or less, rounded or 
truncate at the apex, the third 5-nerved, acute, slightly shorter than the spikelet, the fruiting 
scale deep seal-brown when mature, conspicuously longitudinally striate, the apex apiculate. 
TYPE LOCALITY: High pine land, Eustis, Florida. 
DISTRIBUTION : Florida. 
ILLUSTRATION: Bull. U. S. Dep. Agr. Agrost. 7: f. 39. 
5. Syntherisma Bakeri Nash, Bull. Torrey Club 25: 296. 1898. 
Stems tufted, 1 m. tall or less, simple, erect; leaf-sheaths somewhat compressed, densely 
hirsute with ascending hairs; blades 2 mm. wide or less, involute when dry, smooth on both 
surfaces, glabrous beneath, also above except at the very base where they are densely 
pubescent with long hairs, those on the innovations 2-4 dm. long, on the stems 1-2.5 dm.; 
panicle long-exserted, the axis 4-7 cm. long; racemes usually 3, sometimes 2, commonly some- 
what branched at the base, 14-22 cm. long, the rachis 3-angled, the angles not winged but 
strongly hispidulous; spikelets about 2.25 mm. long, elliptic, usually in 3’s, on successively 
longer pedicels which are 3-angled, the angles strongly hispidulous, the first scale wanting, the 
second about four fifths as long as the spikelet, acute or acutish, sparsely pilose at the apex, 
otherwise glabrous, 3-nerved, the third a little shorter than the fruiting scale, 7-nerved, gla- 
brous, the fruiting scale deep chestnut-brown when mature, elliptic, obtusely apiculate, rather 
faintly striate. 
TYPE LOCALITY: Grasmere, Florida. 
DISTRIBUTION : Florida. 
6. Syntherisma Ischaemum (Schreb.) Nash. 
Panicum lineare Krock. Fl. Sil. 1: 95. 1787. Not P. ineare L,. 1762. 
Panicum Ischaemum Schreb.; Schweigger, Spec. Fl. Erlang. 16. 1804. 
Digitaria humifusa Pers, Syn. Pl, 1: 85. 1805. 
