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 tall, sharply 3-angled, 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; spikelets narrowly cylindric, 

 acute, }{ / -2 / long, less than %' thick, solitary or 

 2-5 together at the ends of the rays of the umbel, 

 the rays 1/-4/ long; scales awned; bristles 2-4, 

 shorter than the grayish-white dull obovate 

 achene, 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 Philippi. 

 Least Duckweed. (Fig. 886a.) 



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



Thallus oblong to elliptic, i // -2 // long, obscurely i-nerved, 

 or nerveless, with a row of papules along the nerve, the 

 lower surface plat, or slightly convex ; 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. 1: p. 367.] 2a. WOLFFIELLA Hegelm. Engler's Bot. Jahrb. 21: 



303- 1895. 

 Thallus thin, unsymmetrical, 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 Woljfta.] 



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. Florida Wolmella. 



(Fig. 889a.) 



Wolffia gladiata var. Floridana J. D. Smith, Bull. Torr. 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, 1]^"-$" 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. 



