74 POACEAE 



pairs, 5-9 cm. long : spikelets in pairs, on shorter puberulent pedicels, about 1.8 ram. long 

 and about 1.5 mm. wide, broadly obovate, the 2 outer scales densely pubescent with spread- 

 ing glandular-tipped hairs, the first scale 3-nerved, the second 2-nerved, or the midnerve 

 very rarely present. 



In dry sandy soil, peninsular Florida. Summer. 



20. Paspalum dasyphyllum Ell. Plant yellowish green. Stems tufted, stout, 2-6 

 dm. tall : leaf -sheaths, as well as both surfaces of the blades, densely pubescent with long 

 yellowish spreading hairs ; blades erect or ascending, thick, lanceolate, 2 dm. long or less, 

 usually 1-2 cm. broad, sometimes a little narrower: racemes on the main stem in 2's or 

 3' s, those on the branches single, 4-10 cm. long : spikelets in pairs, on shorter puberulent 

 pedicels, 2-2.2 mm. long and about 1.8 mm. wide, broadly obovate, the first scale usually 

 more or less pubescent with spreading glandular-tipped hairs, 3-nerved, the second scale 

 glabrous, usually 2-nerved or sometimes 3-nerved. 



In dry usually sandy places, South Carolina to Florida ; also in Missouri. Summer. 



21. Paspalum scrobiculatum L. Glabrous. Stems densely tufted, 2-6 dm. tall : 

 leaf-blades erect, flat, 1 dm. long or less, 2 -5 mm. wide, those on the innovations longer : 

 racemes 2-5, erect or nearly so, 2-4 cm. long : spikelets singly disposed, oval, about 2 mm. 

 long and 1.5-1.75 mm. wide, glabrous, the outer scales 5-nerved, the lateral nerves ap- 

 proximate and distant from the midnerve, the third scale deep seal brown when mature, 

 scrobiculate. 



In sandy soil, Florida. Also in tropical countries. Summer and fall. DITCH MILLET. 



22. Paapalum laeve Michx. Stems tufted, 3-6 dm. tall : leaf -sheaths compressed, 

 glabrous ; blades short, those on the stem usually less than 1.5 dm. long, 5-8 mm. wide, 

 pubescent above near the base : racemes 2 or 3, spreading, 4-8 cm. long : spikelets singly 

 disposed, glabrous, oval, 2.5-3 mm. long, 2-2.5 mm. wide, the 2 outer scales 3-nerved. 



In fields, District of Columbia to Kentucky, Georgia, Arkansas and Texas. Summer. 



23. Paspalum angustifollum Le Conte. Stems tufted, 6-12 dm. tall : leaf-sheaths 

 compressed, glabrous ; blades long, the larger 2-4 dm. long, less than 1 cm. wide, gla- 

 brous, or the upper surface sometimes sparingly hirsute near the base : racemes 3-5, spread- 

 ing, usually 6-10 cm. long, sometimes shorter : spikelets singly disposed, oval, 3-3.5 mm. 

 long and about 2.5 mm. wide, glabrous, the 2 outer scales 3-nerved. 



In fields, District of Columbia to northern Florida, Louisiana, Kansas and Missouri. Summer 

 and fall. 



24. Paspalum australe Nash. Stems tufted, 4-7 dm. tall : leaf-sheaths usually hir- 

 sute only on the margins ; blades erect, short, generally 1.5 t dm. long or less, 5-10 mm. 

 wide, strongly ribbed, rather thick, firm, glabrous beneath or nearly so, hirsute above : 

 racemes 2-5, usually 2 or 3, finally spreading, commonly 5 cm. long or less, sometimes 

 longer : spikelets singly disposed, oval, 2.7-3 mm. long and about 2 mm. wide, the 2 outer 

 scales 3-nerved, glabrous. 



On grassy flats and banks, Virginia to Florida and Alabama. Summer and fall. 



25. Paspalum longipilum Nash. Stems tufted, compressed : leaf -sheaths much com- 

 pressed, keeled, the lower ones strongly hirsute with very long hairs : blades erect, firm, 

 stiff, folded when dry, 2 dm. long or less, 6-12 mm. wide, glabrous beneath, densely hir- 

 sute above with very long hairs : racemes 2 or 3, spreading or ascending, usually 4-6 cm. 

 long, sometimes longer : spikelets singly disposed, oval, about 3 mm. long and a little ex- 

 ceeding 2 mm. broad, the 2 outer scales glabrous, 5-nerved, the lateral nerves close together 

 and near the margin. 



In moist or wet soil, peninsular Florida. Spring and summer. 



26. Paspalum praelongum Nash. Stems tufted, 5-10 dm. tall : leaf-sheaths usually 

 hirsute all over ; blades long, usually exceeding 1.5 dm., sometimes 3 dm. long, 5-10 mm. 

 wide, thin, lax, hirsute on both surfaces : racemes 2-4, usually 3 or 4, finally spreading, 

 5-10 cm. long : spikelets singly disposed, oval, 2.5-2.8 mm. long and about 2 mm. wide, 

 the 2 outer scales 3-nerved, glabrous. 



In moist or dry soil, District of Columbia to Georgia, Alabama and Missouri. Summer and fall. 



27. Paspalum circulate Nash. Stems tufted, 4-8 dm. tall : leaf-sheaths hirsute 

 with long hairs, compressed ; blades 2 dm. long or less, 5-8 mm. wide, glabrous beneath 

 or hirsute along the midnerve, the upper surface hirsute with long hairs : racemes 2-4, 

 spreading or ascending, 4-6 cm. long : spikelets singly disposed, glabrous, orbicular, about 

 2.5 mm. in diameter, the 2 outer scales thin, finely but distinctly striate. 



In fields and meadows. New York to North Carolina ; also in Missouri Summer and fall. 



28. Paspalum Simpsonii Nash. Stems tufted, slender, 4-8 dm. tall : basal leaf- 

 sheaths hirsute, the rest glabrous; blades lanceolate, 4-10 cm. long, 3-10 mm. wide, gla- 

 brous on both surfaces, ciliate on the margins below the middle : racemes 3-5, spreading, 



