POACEAE 147 
Panicle open, usually less than 2.5 dm. long, its branches spreading or ascending : spike- 
lets not crowded. 
Spikelets 1.5 mm. wide or less: palets remaining attached to the continuous rachis for 
some time after the flowering scales have fallen. 
Flowering scales thin, usually bright purplish, the lateral 
nerves faint or wanting: spikelets about 1 mm. wide. 5. E. pilosa. 
Flowering scales firm, usually dull purple or green, the lateral 
nerves very prominent: spikelets about 1.5 mm. wide. 6. E. Purshii. 
Spikelets more than 2 mm. wide: palets falling with the flowering 
scales and the internodes of the rachis. 7. E. major. 
** Perennials. 
Spikelets scattered on long branches. 
Branches of the open panicle spreading or ascending, rather stiff. 
Lateral nerves of the flowering scales faint. 8. E. lugens. 
Lateral nerves of the flowering scale very prominent. 
Spikelets short-pedicelled, the pedicel 1 mm. long or less. 9. E. curtipedicellata, 
Spikelets on pedicels which are often as long as or much ex- 
ceeding the spikelet. 
Pedicels usually less than twice as long as the spikelet. 
Margins of the flowering scales convex above the middle, 
the scales hence merely acute. 10. E. pectinacea. 
Margins of the flowering scales straight or concave above 
the middle, the scales hence acuminate. 11. E. refracta. 
Pedicels many times longer than the spikelets. 12. E. Ellioitii. 
Branches of the narrow and elongated panicle long and flexuous, 
erect or nearly so. 13. E. trichodes. 
Spikelets crowded and clustered on short branches : 
Linear-lanceolate, 2 mm. wide or less. 14. E. simplex. 
Oblong to oval, exceeding 3 mm. in width. 
Flowering scales 3-4 mm. long, acute, firm. 15. E. secundiflora. 
Flowering scales 5 mm. long, acuminate, thin and papery. 16. E. Beyrichii. 
b. es of the spikelets beautifully and conspicuously ciliate with long 
airs. 
Panicle contracted, spike-like, the branches short and appressed. l7. E. ciliaris. 
Panicle open, its branches spreading. 18. E. plumosa. 
B. Stems creeping, rooting at the nodes. 3 
Flowering scales less than 2 mm. long, glabrous. 19. E. hypnoides. 
Flowering scales 3-4 mm. long, pubescent. 20. E. capitata. 
1 Eragrostis Frankii Steud. Stems 1.5-4 dm. tall, tufted, erect, often decumbent at 
the base, branching : leaf-blades 5-13 cm. long, 2-4 mm. wide, rough above: panicle 5-15 
cm. long, open, its branches ascending: spikelets ovate, 2-3 mm. long, 3-5-flowered, the 
flowering scales acute, the lower ones 1.5 mm. long, their lateral nerves obscure. 
In moist places, Connecticut to Minnesota, Mississippi, Louisiana and Kansas. Fall. 
2. Eragrostis capillàris (L.) Nees. Stems 2-5 dm. tall, slender, erect, finally 
branching at the base: leaf-blades 7-25 cm. long, 2-4 mm. wide: panicle diffuse, 1-4 dm. 
long, its capillary branches spreading or ascending: spikelets ovate, 2-3 mm. long, 2-4- 
flowered, the flowering scales acute, 1.5 mm. long, their lateral nerves obscure. 
In dry places, Rhode Island and New York to Missouri, Georgia and Texas. Summer and fall, 
3. Eragrostis hirsüta (Michx.) Nash. Stems densely tufted, rather stout, 7-13 dm. 
tall: leaf-sheaths, at least the lower ones, strongly papillose-hispid, each with a tuft of hairs 
at the apex ; blades, the lower leaves, 4-6 dm. long, less than 1 cm. wide, long-acuminate, 
flat : panicle 5-8 dm. long, diffuse, its long branches finally widely spreading: spikelets 
3-5-flowered, 3-4 mm. long, the flowering scales 2-2.5 mm. long. 
In dry fields, thickets and woodlands, South Carolina to Florida, the Indian Territory and Texas. 
Summer and fall. 
4. Eragrostis glomeràta (Walt.) L. H. Dewey. Stems erect, rather stout, 2.5-8 
dm. tall: leaf-sheaths glabrous ; blades rough, 2 dm. long or less, less than 1 cm. wide, 
long-acuminate: panicle narrow, contracted, 1-5 dm. long, its branches erect or nearly so : 
spikelets 5-10-flowered, 2.5-3.5 mm. long, the flowering scales about 1 mm. long. [£. 
conferta Trin. ] 
In damp or wet places, South Carolina to Florida, Louisiana, Arkansas and Texas. Alsoin Mexico. 
Summer and fall. 
5. Eragrostis pildsa (L.) Beauv. Stems tufted, 1.5-5 dm. tall, erect, slender, 
branched : jeaf-blades 2-13 cm. long, 2 mm. wide or less: panicle 5-15 cm. long, its 
branches finally spreading, often hairy in the axils : spikelets 5-12-flowered, 3-6 mm. long, 
about 1 mm. wide, the flowering scales acute, the lower ones 1.5 mm. long, thin, the lateral 
nerves faint or wanting. 
In eultivated ground or waste placés, southern New England to Illinois, Kansas, Florida and 
Texas. Naturalized from Europe. Summer and fall. 
6. Eragrostis Pürshii Schrad. Stems 1.5-5 dm. tall, tufted, finally much-branched : 
leaf-blades 3-9 cm. long, 2 mm. wide or less: panicle 7-20 cm. long, open, its branches 
spreading, naked in the axils: spikelets 5-15-flowered, 3-8 mm. long, about 1.5 mm. wide, 
the flowering scales acute, firm, the lower ones 1.5 mm. long, the lateral nerves prominent. 
In dry places, throughout the United States and extending into Ontario. Summer and fall. 
