Vol.. III.] 



APPENDIX. 



509 



[Vol. I: p. 268.] 19a. Scirpus Novae-Angliae Britton 

 Coast Sedge. (Fig. 627a.) 

 Perennial by rootstocks; culm stout, erect, 

 4°-7° lall, sharply 3-anglcd, the sides flat or 

 nearly so. Leaves long, 4"-6" wide, somewhat 

 roughish on the margins when dry, the lowest 

 reduced to pointed sheaths, those of the invo- 

 lucre 2-5, the longer of them much exceeding 

 the inflorescence; spikelels narrowly cylindric, 

 acute, ^{'-2' lonf;, less than %' thick, solitary or 

 2-5 together at theendsof theraysof the umbel, 

 the rays l'-4' long; scales awued; bristles 2-4, 

 shorter than the grayish-ivhite dull obovate 

 acheue, which is distinctly 3-angled; stamens 3; 

 style 3-cleft. 



In fresh water and brackish marshes, Stratford 

 and Fairfield, Conn. (Dr. Edwin H. Eames), Spuy- 

 ten Duyvil, New York City (E. P. Bicknell). 



New England 



[Vol. I: p. 366.] 2a. Lemna minima Pbilippi. 

 Least Duckweed. (Fig. 886a.) 



Lemna minima Philippi, Linnaea, 33: 239. 1844. 



Thallus oblong to elliptic, i"-2" long, obscurely \-nerved, 

 or >!erveless, with a row of papules along the nerve, the 

 lower surface Jlat, or slightly cojivex ; the apex rounded, 

 rootcap usually short, a little curved, rarely perfectly straight, 

 cylindric, blunt ; spathe open; pistil short-clavate; stigma 

 concave; ovule solitary, obliquely orthotropous; seed oblong, 

 pointed, about 16 ribbed, with many transverse striations. 



Georgia and Florida to Kansas, Wyoming and California. 



[Vol. i: p. 367.] 



2a. WOLFFIELLA Hegelm. Engler's Bot. Jahrb. 21: 

 303- 1895. 



Thallus thin, uusymmetrical, rootless, curved in the form of a segment of a band, punc- 

 tate on both surfaces with numerous brown pigment-cells. Pouch opening as a cleft in the 

 basal margin of the thallus, a stipe attached to its margins. Flowers and fruit unknown. 

 [Diminutive of Wolffia.'] 



About 7 species, mostly of tropical regions. Besides the following, 2 others are known from 

 ■western North America. 



I. "Wolffiella Floridana (J. D. Smith) Thompson. 



(Fig. 889a.) 



Wolffia gladiala var. Floridana J. D. Smith, Bull. Torn Club, 7: 

 64. 1880. 



Wolffia Floridana J. D. Smith; Hegelm. Engler's Bot. Jahrb. 21; 

 305. 1895. 



Wolffiella Floridana Thompson, Ann. Rep, Mo. Bot. Gard. 9: 

 17. 1897. 



Thalli solitary, or commonly coherent for several genera- 

 tions forming densely interwoven masses.strap-shaped, scythe- 

 shaped, or doubly curved, tapering from the rounded oblique 

 base to a long-attenuate apex, lYz"-^" long, 14-21 times as 

 long as wide; basal portion of the long stipe persistent, the 

 pouch elongated-triangular, or the upper angle rounded. 



Georgia and Florida to Missouri, Arkansas and Texas. 



Florida Wolffiella. 



