HI,; ADDITIONS AND CORRECTIONS 



Page 



finely villous beneath, 715 cm. long; involucre of 2, broad, laciniate, 

 nearly distinct bracts, downy and glandular-bristly; nut compressed, 

 12mm. high, light brown. Thickets: Me. Sask. S. D. (Black Hills) 

 Kans. Fla. Austral Boreal. Mr-Ap. 



JOT I'mler C. rugulosa add the synonym Celtis reticulata vestita Sarg. 



Jd7 After ('. rtticulata insert: 



4a. Celtis villosula Rydl)erg, sp. nov. Shrub or small tree; branches 

 light brown, conspicuously villous when young; petioles 3-5 mm. long, 

 villous; leaf-blades broadly and obliquely ovate, 3-4 cm. long, 1.5-2.5 cm. 

 wide, dark and grayish green and pustulate hispidulous above, pale and 

 short-hirsute on the veins beneath, acute, subentire, more or less corclate 

 :it the base; peduncles about 8 mm. long, villous; fruit (unripe) 

 5-6 mm. long, subglobose, yellowish-green; style-branches 4 mm. long. 

 I'tah (without definite locality), M. E. Jones. 



'2'2 1 In the 5th line of the description of E. nebraskense for "2-3 cm." read 

 "2-3 mm." 



232 After 16 R. i/K.ciranus insert: 



16a. Rumex Britannica L. Perennial; stem 1-2 high; leaves oblong- 

 lanceolate, erose-crenate on the margins, the lower petioled, acute at 

 each end, 3-6 dm. long, the middle ones truncate or cordate at the base; 

 whorls of flowers crowded, in a large panicle; outer perianth lobes in 

 fruit orbicular or round-ovate, obtuse, finely reticulate, all three tubercle- 

 bearing. Wet places: Newf. Minn. Kans. N. J.; Utah; adv. or nat. 

 from Eur. Jl-Au. 



234 Before P. buxiforme insert: 



2a. Polygonum achoreum Blake. Annual; stem ascending, much 

 branched, 1.5-4 dm. long, striate, glabrous; ochreae scarious, whitish 

 with a brown base, soon lacerate, 4-9 mm. long; leaves crowded, elliptic, 

 oval, or obovate, rounded at the apex, 7-22 mm. long, 4-10 mm. wide, 

 bluish-green; perianth bluish-green, in fruit 3.5-4 mm. long, the outer lobes 

 with or without a narrow pale margin, the inner white- or pink-margined; 

 achenes included, obscurely punctate, dull, 2.5 mm. long. Waste places 

 and sandy soil: Que. Vt. Sask. Mont. Kans. Mo. Jl-Au. 



236 Instead of the first part of the Key insert: 



Racemes spikelike, terminal only, solitary or 2, rarely 3 or 4; plant perennial 



usually with both terrestrial and aquatic forms. 



Racemes broadly oblong, rounded at the apex; leaf-blades in the terrestrial 

 form lance-linear or lance-oblong; in the aqiiatic form oblong, glabrous, 

 broadest at the middle, scarcely ever subcordate at the base; ochreae 

 of the upper leaves in the terrestrial form usually with foliaceous 

 dilated margins. 



Peduncles glabrous or in the terrestrial form sometimes sparingly hirsute; 

 leaves dark green and especially in the aquatic form shining above. 

 Racemes 15-18 mm. thick; leaf-blades in the terrestrial form lance- 

 oblong; in the aquatic form broadly oblong, usually ^3-^2 as broad 

 as long, truncate or abmptly contracted at the base, and obtuse 

 at the apex, rarely acute at each end, glabrous; upper ochreae in the 

 aquatic form infla'ted, membranous. 1. P. psycrophila. 



Racemes 10-15 mm. thick; leaf -blades in the terrestrial form lance- 

 oblong; in the aquatic form narrowly oblong, M~M as broad as long, 

 acute or acutish at each end; peduncles in the terrestrial form often 

 with a few hairs; ochreae in the aquatic form not dilated. 



la. P. fluitans. 



Peduncles in the terrestrial form distinctly hirsutulous ; leaf-blades light 

 green, in the terrestrial form lance-oblong, pubescent on both sides; 

 in the aquatic form glabrous and dull above; flowering raceme 10-15 

 mm. thick. 2. P. n^braskensis. 



Racemes linear, tapering to the apex; peduncles in the terrestrial form 

 pubescent or glandular, in the aquatic form sometimes slightly so; 

 leaf-blades broadest near the base, in the terrestrial form of a lanceo- 

 late type, acuminate, in the aquatic form ovate, acute at the apex, 

 often cordate or subcordate at the base. 



ilaceme about 3 cm. long or less; flowers 3-4 mm. long; peduncles in the 

 terrestrial form hispidulous, scarcely glandular; leaf-blades in this form 

 linear-lanceolate, usually 3 cm. wide; ochreae sometimes with a folia- 

 ceous border. 2a. P. mesochora. 



