152 NORTH AMERICAN FLORA [VOLUME 17 
Paspalum ambiguum DC. Fl. Fr. 3: 16. 1805. 
Syntherisma glabrum Schrad. F]. Germ. 163. 1806. 
Panicum glabrum Gaudin, Agrost. Helv.1: 22. 1811. 
Panicum glabrum mussissippiense Gatt. Tenn. F1. 95, 1887. 
Syntherisma lineare Nash, Bull. Torrey Club 22: 420. 1895. 
Panicum lineare mississippiense Gatt.; Beal, Grasses N. Am. 2: 111. 1896. 
Syntherisma tineare mississippiense Nash, Bull. Torrey Club 25: 300, 1898. 
Syntherisma humifusum Rydb. Mem. N. Y. Bot. Gard. 1: 469. 1900. 
Stems 2-5 dm. tall, slender, at length branched at the base, finally prostrate and forming 
large mats, smooth and glabrous; leaf-sheaths flattened, smooth, glabrous; blades up to 1.5 
dm. long, 2.5-6 mm. wide, flat, erect or nearly so; panicle finally long-exserted, the axis 1-3 
em. long; racemes 2-5, 2-8 cm. long, finally widely spreading; spikelets slightly exceeding 
2 mm. long, elliptic, acutish, on 3-angled pedicels which are sparingly or not at all hispid at 
the apex, usually in pairs, the outer scales usually purplish or purple, the first scale wanting, or 
sometimes present as a scarious rudiment, the second and third scales about equal, pubescent, 
the second 3-nerved, the third 7-nerved, the fruiting scale deep chestnut-brown when mature, 
striate, acute. 
Type Locaviry: Erlangen, Germany. 
DISTRIBUTION : Nova Scotia to Ontario, South Dakota, and Colorado, and south to Florida 
and Texas. Introduced. 
ILLUSTRATIONS: Schrad. Fl. Germ. pl. 3, 7.6; Leers, Fl. Herborn. pl. 2, f. 6; Bull. U. S. Dep. 
Fs Agrost.7: 7.37; Britt. & Brown, Ill. Fl. f. 241; Trin. Ic. pi. 149; Bull. Tenn. Exp. Sta. 7: 
7. Syntherisma badium (Scribn. & Merr.) Chase, Proc. Biol. Soc. 
Wash. 19: 191. 1906. 
Panicum badium Scribn. & Merr. Bull. U. S. Dep. Agr. Agrost. 24: 12. 1901. 
Stems tufted, up to 1 m. tall, glabrous; leaf-sheaths glabrous; blades erect, up to 8 cm. 
long, 3-5 mm. wide, hirsute, especially on the lower surface; racemes 2 or 3, erect, 4-8 cm. 
long; spikelets about 2.5 mm. long, in pairs, the one on a short, the other on a longer pedicel, 
the first scale wanting or rarely present as a mere rudiment, the second and third scales pubes- 
cent with glandular-tipped hairs, the second 5-nerved, about equaling the fruiting scale, the 
third 3-nerved, narrower than the second and shorter than the spikelet, the fruiting scale 
deep-brown, strongly papillose-striate. 
TYPE LOCALITY: Sierra de San Felipe, Oaxaca. 
DISTRIBUTION: Jalisco, Michoacan, and Oaxaca. 
ILLUSTRATION : Bull. U. S. Dep. Agr. Agrost. 24: f. 3. 
8. Syntherisma paniceum (Sw.) Nash. 
Milium paniceum Sw. Prodr. 24. 1788. 
Agrostis jamaicensis Poir. in Lam. Encycl. Suppl. 1: 258. 1810. 
Digitaria violascens Link, Hort. Berol. 1: 229. 1827. 
Panicum violascens Kunth, Rév. Gram. 33. 1829. 
Stems tufted, up to 4.5 dm. tall, smooth and glabrous; leaf-sheaths smooth and glabrous; 
blades erect or ascending, linear, long-acuminate, smooth and glabrous, up to 1 dm. long and 
6 mm. wide; racemes in a terminal whorl of 3-5, rarely fewer, sometimes with 1 or 2 additional 
racemes below, up to 1 dm. long, erect or ascending, the rachis winged, about 0.75 mm. wide; 
spikelets on hispidulous pedicels, commonly in pairs, sometimes in 3’s, about 1.3 mm. long, 
white, acute, elliptic, the first scale wanting, the second and third scales about equal and equal- 
ing or a trifle shorter than the fruiting scale, appressed-pubescent, 3-5-nerved, the fruiting 
scale deep-brown, acute. 
TYPE LOCALITY: Jamaica. . : 
DISTRIBUTION: Colorado; northern Mexico; Bermuda; Jamaica; Trinidad; also in the Old 
World tropics. 
9. Syntherisma Simpsoni (Vasey) Nash, Bull. Torrey 
Club 25: 297. 1898. 
Panicum sanguinale Simpsoni Vasey, Contr. U. 8. Nat. Herb. 3:25. 1892. 
Panicum Simpsoni Beal, Grasses N. Am. 2: 109, 1896. 
Stems 8-12 dm. tall, branching, at first erect, finally prostrate at:the base and rooting 
at the lower nodes; leaf-sheaths loosely embracing the stem, copiously papillose-hirsute, the 
