POACEAE 97 



62. Panicum lucidum Ashe. Stems tufted, 2-8 dm. long, slender, glabrous, weak, at 

 first erect or ascending, simple, later prostrate and much branched : leaves 3-5 ; sheaths 

 much shorter than the internodes, ciliate on the margin ; blades thin, glabrous, the primary 

 ones usually erect, 3-6 cm. long, 3-6 mm. wide, those on the branches much smaller, gen- 

 erally 3 cm. long or less and 1.5-3 mm. wide, spreading to erect : primary panicle ovoid, 

 3-7 cm. long, its branches spreading or somewhat ascending : spikelets glabrous, 1.5-2 

 mm. long and 0.6-0.75 mm. wide, elliptic. 



In wet shady places, visually sphagnum swamps, New Jersey and Maryland to Florida and Missis- 

 sippi. Summer and fall. 



63. Panicum curtivaginum Ashe. Stems tufted, 6-8 dm. long, slender, weak, gla- 

 brous, finally branched : leaves 4 or 5 ; sheaths much shorter than the internodes, some- 

 times sparingly ciliate on the margin ; blades erect, glabrous, the primary ones linear, 

 usually 3-6 cm. long, rarely larger, 3-5 mm. wide : panicle 4-8 cm. long, ovoid, its 

 branches ascending : spikelets 2 mm. long and about 1 mm. wide, elliptic, glabrous. 



In sandy soil, Mississippi. Spring and summer. 



64. Panicum curtifolium Nash. A nearly glabrous tufted perennial. Stems 2-3 

 dm. tall, finally much branched : leaves 3 or 4 ; sheaths usually about as long as the in- 

 ternodes, sparsely pubescent with long weak spreading hairs ; blades widely spreading, 

 lanceolate, a few long hairs on the upper surface near the base, the primary blades 1.5-3 cm. 

 long, 3-5 mm. wide : panicle 2-4 cm. long, broadly ovoid, its branches widely spread- 

 ing : spikelets about 1.5 mm. long and about 0.75 mm. wide, elliptic, glabrous. 



In sandy soil, Mississippi. Spring and summer. 



65. Panicum sphagnicola Nash. Grayish green. Stems 6-10 dm. long, at first 

 simple, finally repeatedly and dichotomously branched, the branches very divergent : leaf- 

 blades glabrous, thick, lanceolate, the primary ones 5-8 cm. long, 4-10 mm. wide, those 

 on the branches 2. 5 cm. long or less, 1-3 mm. wide, appressed : primary panicle about 5 

 cm. long, its branches spreading, 1.25-2.5 cm. long, the secondary panicles about 1.25 cm. 

 long, raceme-like : spikelets 2.5 mm. long and 1 mm. wide, few and appressed, glabrous 

 or sparingly pubescent. 



In sphagnum swamps, northern Florida. Summer. 



66. Panicum nudicaule Vasey. Glabrous. Steins 5-6 dm. tall : leaves 3, the lower 

 2 approximate and near the base of the stem, the other distant, above the middle of the 

 stem ; blades erect, firm, lanceolate, 2.5-7 cm. long, 3-8 mm. wide : panicle 4-7 cm. long, 

 broadly ovate, its branches ascending or spreading : spikelets 3 mm. long and 1 mm. wide, 

 elliptic, acute, glabrous. 



In swamps, western Florida. Spring and summer. 



67. Panicum Wrightianum Scribn. Stems tufted, 3-4 dm. long, puberulent, slen- 

 der, at first erect, finally much branched and forming broad mats : leaves 5-7 ; sheaths 

 minutely pubescent with spreading hairs, ciliate on the margins ; blades minutely and softly 

 pubescent on the lower surface, the upper surface pubescent with longer hairs, the primary 

 blades 2-4.5 cm. long, 2-4 mm. wide, those on the branches much smaller : primary panicle 

 3-5 cm. long, ovoid, its branches ascending : spikelets a little less than 1 mm. long and 

 about 0.4 mm. wide, elliptic, pubescent. 



In sandy soil, North Carolina to Florida and Mississippi. Also in Cuba. Summer and fall. 



68. Panicum Baldwinii Nutt. Glabrous or nearly so. Stems densely tufted, slender, 

 1-2 dm. tall, rarely longer, sometimes a little puberulent, erect, finally much branched and 

 ascending or prostrate : leaves on the primary stem 2, or sometimes 3 ; sheaths less than ^ 

 as long as the internodes ; blades erect or ascending, lanceolate, rough on the margins, the 

 primary ones 1-3 cm. long, 1-3 mm. wide : primary panicle 1.5-4 cm. long, broadly 

 ovoid, its branches widely spreading : spikelets 1 mm. long and about 0.7 mm. broad, 

 oval, or somewhat broadly ovoid, glabrous. 



In dry sandy soil, southern Georgia and Florida, Spring and summer. 



69. Panicum ensifolium Baldw. A slender much tufted glabrous perennial. Stems 

 1-3 dm. tall, finally somewhat branched : leaves 2 or 3 ; sheaths very short, several times 

 shorter than the internodes ; blades widely spreading, lanceolate, usually less than 2 cm. 

 long, rarely larger, 1-3 mm. wide, densely puberulent on the lower surface, the basal blades 

 markedly larger and more erect : panicle small, ovate, 1-2 cm. long, occasionally larger, 

 its branches usually ascending : spikelets about 1.3 mm. long and about 0.6 mm. wide, 

 elliptic, pubescent with spreading hairs. [P. nitidum var. ensifolium ( Baldw. ) Chapm. ] 



In sphagnum bogs, North Carolina to Florida and Mississippi. Spring and summer. 



70. Panicum Cuthbe'rtii Ashe. Stems tufted, slender, weak, 2-3 dm. tall, glabrous, 

 finally much branched : primary leaves 3 or 4 ; leaf-sheaths short, ciliate on the margin, 

 much shorter than the internodes ; blades densely pubescent beneath, more sparsely so 



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