Part 3, 1915] POAC3AE) 



253 



overlapping, ciliate on the margin, glabrous, or the lower sparsely pubescent; blades erect, or 

 in laxer forms spreading, sparsely ciliate at 'the rounded base, otherwise glabrous, 6-12 cm. 

 long, 7-12 mm. wide; panicles loosely rather few-flowered, 5-10 cm. long, hardly as wide, the 

 branches ascending or spreading; spikelets 2-2.2 mm. long, 1 mm. wide, elliptic, subacute, 

 pubescent; first glume one third as long as the spikelet or less; second glume and sterile lemma 

 subequal, the glume scarcely as long as the fruit at maturity; fruit 1.9 mm. long, 1 mm. wide, 

 elliptic, subacute. 



Autumnal phase erect, sparingly branched from all the nodes in late summer, the branches 

 erect, the leaves and panicles not greatly reduced. 



Type locality : Cairo, New York . 



Distribution: Newfoundland to New Jersey, and west to Minnesota. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 7: /. 58; Contr. U. S. Nat. Herb. 15: /. 189: 

 Britt. & Brown, 111. Fl. /. 261; ed. 2. /. 350. 



121. Panicum dichotomum L. Sp. PI. 58. 1753. 



Panicum an gusti folium I>Conte; Torr. Cat. PI. N. Y. 91. 1819. Not P. angustifolium Ell. 1816. 



Panicum Iremulum Spreng. Neue Entdeck. 2: 103. 1821. 



Panicum dichotomum viride Vasey, Bull. U. S. Dep. Agr. Bot. 8: 30. 1889. 



Panicum dichotomum divaricatum Vasey, Bull. U. S. Dep. Agr. Bot. 8: 30. 1889. 



Panicum nitidum -paucifiorum Britton, Trans. N. Y. Acad. Sci. 9: 14. 1889. 



Panicum nitidum viride Britton, Trans. N. Y. Acad. Sci. 9: 14. 1889. 



Panicum dichotomum commune Wats. & Coult. in A. Gray, Man. ed. 6. 633. 1890. 



Panicum ramulosum viride Porter, Bull. Torrey Club 20: 194. 1893. 



Chasea dichotoma Nieuwl. Am. Midi. Nat. 2: 64. 1911. 



Vernal phase often purplish; culms 30-50 cm. high, erect, from a knotted crown, the nodes 

 naked or the lower with a few spreading hairs; leaf-sheaths less than half the length of the 

 internodes, sometimes ciliate on the margin, otherwise glabrous, or the lowermost rarely 

 sparingly pubescent; blades spreading, 5-11 cm. long, 4-8 mm. wide, acuminate, slightly 

 narrowed toward the base, glabrous on both surfaces, sometimes with a few long hairs on the 

 margin at the base, the basal blades lanceolate- ovate, long-ciliate on the margin near the base; 

 panicles long-exserted, 4—9 cm. long, the axis and spreading branches flexuous, spikelet-bearing 

 toward the ends; spikelets 2 mm. long, 0.9 mm. wide, elliptic, glabrous or rarely pubescent; 

 first glume one third length of spikelet, subacute; seocnd glume and sterile lemma rather faintly 

 nerved, the glume shorter than the fruit at maturity; fruit 1.8 mm. long, 0.9 mm. wide, elliptic. 



Autumnal culms much branched at the middle nodes, the lower portion usually erect and 

 devoid of blades, thus giving the plants the appearance of diminutive trees as described by 

 Gronovius and Linnaeus; blades much reduced and very numerous, often involute. 



Type locality: Virginia. 



Distribution: New Brunswick to Michigan, and south to Florida and eastern Texas. 

 Illustrations: Bull. U. S. Dep. Agr. Agrost. 17: /. 366; Contr. U. S. Nat. Herb. 15: /. 191; 

 Britt. & Brown, 111. Fl. /. 264; ed. 2. /. 345. 



122. Panicum barbulatum Michx. Fl. Bor. Am. 1: 49. 1803. 



Panicum dichotomum barbulatum Wood, Class-Book ed. 1861. 786. 1861. 

 Panicum pubescens barbulatum Britton, Cat. PL N. J. 280. 1890. 

 Panicum nitidum barbulatum Chapm. Fl. S. U. S. ed. 3. 586. 1897. 

 Panicum gravius Hitchc & Chase; Hitchc. Rhodora 8: 205. 1906. 



Vernal phase in large tufts; culms slender, 50-80 cm. high, erect, or spreading at the sum- 

 mit; lower nodes usually bearded; leaf-sheaths glabrous except a puberulent ring at the summit, 

 the lower usually softly pubescent; blades spreading, 6-10 cm. long, 6-10 mm. wide (the lower 

 shorter), acuminate, rounded at the base, glabrous, the lower rarely puberulent; panicles long- 

 exserted, 6-11 cm. long, as wide or wider, the slender, flexuous branches fascicled, the lower 

 spreading or drooping at maturity, spikelet-bearing at the ends; spikelets oval, 2 mm. long, 1 

 mm. wide, glabrous; first glume one fourth to one third as long as the spikelet, acute; second 

 glume and sterile lemma equal, covering the fruit at maturity; fruit elliptic, 1.8 mm. long, 1 



mm. wide, obscurely apiculate. 



Autumnal phase diffusely branched, forming very large, topheavy reclining bunches, the 

 slender branchlets recurved, the numerous flat blades horizontally spreading. 



Type locality: Carolina. 



Distribution: Massachusetts to Michigan, and south to Georgia and eastern Texas. 



Illustration: Contr. U. S. Nat. Herb. 15: /. 193. 



