APPENDIX, IO57 



P. 37, after Juniperus Virgianina, insert: 



3a. Juniperus scopulorum Sargent. Western Red Cedar. A tree, 

 resembling the eastern Red Cedar, but with larger fruit, 7-8 mm. in diam- 

 eter, which ripens at the close of the second season and usually contains 

 two seeds. Alberta to W. Tex., Br. Col., Ore., Nev. and Ariz. 



P. 40, before Sparganium simplex, insert: 



2a. Sparganium Americanum Nutt. Simple-stemmed Bur-reed. Sim- 

 ilar to 5". androcladum, but the stem simple, the lower heads of the inflores- 

 cence merely peduncled. Leaves drying green, the upper with more or 

 less sac-like bases and broad hyaline-scarious margins; nutlets slightly 

 angled, each gradually narrowed into a stout conspicuous style. In low 

 grounds or ponds, Ont. to Br. Col., Penn. and the Ind. Terr. Summer. 



P. 40. after Sparganium minimum, add: 



5. Sparganium hyperbdreum Laest. Northern Bur-reed. Stem 2-3 

 dm. high; leaves shorter and narrower than those of S. minimum, 1-3 

 mm. wide; inflorescence 1.5-2.5 cm. long; pistillate heads 1 or 2, sessile, 

 or the lower one short-peduncled; ripe fruiting heads 5-10 mm. in diam- 

 eter; nutlets oblong, obscurely triangular at the summit; stipe very short, 

 stigma oval, oblique, minute, sessile, or nearly so. Lab. and Hudson 

 Bay. Also in northern Europe. Summer. 



P. 49. Additional species and subspecies of Potamogeton have been de- 

 scribed by Arthur Bennett in recent papers published in the " Journal of 

 Botany." 



P. 68, after Erianthus brevibarbis Michx., insert: 



4a. Erianthus contortus Ell. Twisted-awned Plume-grass. Culms 

 1-2 m. tall, the summit and panicle-axis glabrous, or nearly so; leaves 

 1.5-8 dm. long, 5-20 mm. wide; panicle 1.5-3 d m - long, 3-5 cm. wide; 

 spikelets crowded, exceeding the basal hairs and about one-half again as 

 long as the internodes, the outer scales 7-7.5 mm. long, the fourth scale 

 2-toothed at the apex, the awn 1.5-2 cm. long, the included portion often 

 a little spiral at the base, the remainder loosely spiral. In pine woods, 

 Del. to Fla. and Miss. Sept. and Oct. Differs from E. brevibarbis in hav- 

 ing the spikelets smaller and the exserted portion of the awn loosely spiral. 



P. 70, after Andropogon Virginicus L., insert: 



4a. Andropogon tetrastachyus Ell. Four-spiked Beard-grass. Culms 

 tufted, 8-15 dm. tall; sheaths, at least the lower ones, densely villous, with 

 dark hairs; leaves 4 dm. long or less, 2-4 mm. wide, the lower ones villous 

 on both surfaces toward the base; spathes usually 3-4 cm. long, extending 

 beyond the racemes; racemes usually in fours, 3-4 cm. long; sessile spike- 

 let 3-4 mm. long, the awn straight, 1.5-2 cm. long. In dry or moist soil, 

 Va. (according to T. H. Kearney, Jr.) to Fla. and Ala. Sept. and Oct. 

 Differs from A. Virginicus in having the sheaths, at least the lower ones, 

 densely villous all over, and the racemes usually in fours. 



P. 73, after Paspalum laeve Michx., insert: 



5a. Paspalum angustifolium Le Conte. Narrow-leaved Paspalum. 

 Culms tufted. 6-12 dm. tall; sheaths compressed, glabrous; leaves long, 

 the larger 2-4 dm. long, less than 1 cm. wide, glabrous, or the upper sur- 

 face sometimes sparingly hairy near the base; racemes 3-5, spreading, 

 usually 6-10 cm. long; spikelets singly disposed, 3-3.5 mm. long and about 

 2.5 mm. wide, glabrous. In fields, D. C. to Fla., La., Kans. and Mo. 

 June-Sept. Differs from P. laeve in having the leaves elongated and in 

 the more numerous racemes. 



