?6 FLORA. 



i. Amphicarpon Amphicarpon (Pursh) Nash. (I. F. f. 238.) Culms 3-4.5 

 dm. tall, slender, glabrous. Sheaths papillose-hirsute; leaves 2.5-15 cm. long, 4-12 

 mm. wide, erect, hirsute and ciliate; panicle linear, 1-1.5 dm. l n g? branches erect; 

 spikelets about 4 mm. long, elliptic; outer scales 5 -nerved, glabrous; subterranean 

 spikelets ovoid in fruit, about 6 mm. long. In moist pine barrens, N. J. to Fla. 

 near the coast. Aug.-Sept. [A. Purshii Kunth.] 



12. ERIOCHLOA, H. B. K. 



Annual or perennial grasses, with flat leaves and short-pedicelled spikelets 

 borne in secund spikes, which form a terminal panicle. Spikelets with an annular 

 callus at the base and articulated to the pedicel. Scales 3, the two outer mem- 

 branous, acute, the inner one shorter, indurated and subtending a palet and a per- 

 fect flower. Stamens 3. Styles distinct. Stigmas plumose. Grain free. [Greek, 

 signifying wool-grass.] 



I. Eriochloa punctata (L.) W. Hamilt. DOTTED MILLET. (I. F. f. 239.) 

 Culms 3-9 dm. tall. Sheaths sometimes pubescent ; leaves 5-^5 cm. long ; spikes 

 4-25, 2.5-5 cm - l n g' sessile or nearly so; rachis pubescent; spikelets about 4 mm. 

 long, ovate-lanceolate, acuminate; outer scales pubescent with appressed silky 

 hairs, the third about 2 mm. long, rounded at the apex and bearing a pubescent 

 awn about I mm. long. Neb. to Tex. and Mex. Widely distributed in trop. Am. 



13. SYNTHERISMA Walt. 



Annual grasses, with flat leaves and spikelets borne in pairs or sometimes in 3*5, 

 in secund spikes which are digitate or approximate at the summit of the culm. 

 Spikes often purplish. Scales of the spikelet 4, sometimes 3 by the suppression of 

 the lowest one; the fourth or innermost scale chartaceous, subtending a palet of simi- 

 lar texture and a perfect flower. Stamens 3. Stigmas plumose. [Greek, crop- 

 making, in allusion to its abundance.] Species about 25, widely distributed in tem- 

 perate and tropical regions. 



Rachis of the racemes with the angles wingless; first scale of the spikelet wanting, or 



sometimes present as an inconspicuous rudiment. 

 Racemes usually short, 2-10 cm. long ; spikelets less than 2 mm. long. 



i. S. filiformis. 

 Racemes usually exceeding 10 cm. long, rarely shorter; spikelets 2.25 mm. or more 



long. 2. S. villosa, 



Rachis of the racemes with the lateral angles broadly winged; first scale of the spikelet 



usually present, generally wanting in Nos. 3 and 4. 

 Pedicels terete or nearly so, sparingly if at all hispidulous. 



Sheaths and leaves strongly pubescent; second scale one-half or less as long as 



the spikelet. 3. S. serotina. 



Sheaths and leaves glabrous; second scale nearly as long as the spikelet. 



4. S. linearis. 

 Pedicels sharply 3-angled, the angles strongly hispidulous. 



Spikelets usually less than 3 mm. long; third scale with the first and second 

 nerves on each side hispid above the middle. 5. S. sanguinalis. 



Spikelets more than 3 mm. long ; third scale with the nerves smooth. 



6. S.fimbriata. 



1. Synth srisma filiformis (L.) Nash. SLENDER FINGER-GRASS. (I. F. f. 242.) 

 Culms 1.5-7 dm. tall. Sheaths hirsute, at least the lower ones; leaves 3-20 cm. 

 long, 1-4 mm. wide; racemes 2-5, 2-10 cm. long, erect or ascending; spikelets 

 about 1.8 mm. long, 0.75 mm. wide, elliptic, acute, in pairs, the first scale want- 

 ing, the second 3-ncrved, the third 7-nerved, the fourth scale deep chestnut-brown 

 at maturity. Dry sandy soil, N. H. to Mich., south to Del., N. C. and the Ind. 

 Terr. July- Sept. \Panicum fi liformc L.] 



2. Syntherisma villosa Walt. SOUTHERN SLENDER FINGER-GRASS. Culms 

 densely tufted, 6-14 dm. tall. Sheaths, at least the lower ones, hirsute; leaves 

 0.7-2.5 dm. long, 3-6 mm. wide; racemes 2-8, commonly more than 5, 4-:o cm. 

 long, generally 12-15 cm., erect or ascending; spikelets 2.5 mm. long, about 0.8 

 mm. wi.le, elliptic, acute, usually in 3*3, the first scale wanting, the second scale 

 3-nerved, the third scale 7-nerved, the fourth scale deep chestnut-brown at matur- 

 ity. Sandy soil, principally along the coast, from Ga. and Fla. to Tex.; also in 

 the Ind. Terr, and 111. June-Oct. 



