ADDITIONS AND CORRECTIONS 1117 



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Racemes 3-6 cm. long; flowers 4-5 mm. long; peduncles in the terrestrial 

 form decidedly glandular and leaf-blades broadly lanceolate, 

 usually more than 3 cm. wide; ochreae never with foliaceous border. 

 Bracts glabrous or in the terrestrial form glandular at base and hispid- 

 ciliate on the margins: leaves in the terrestrial form nearly glab- 

 rous, except the hispidulous veins and margins. 



3. P. coccinea. 

 Bracts in the terrestrial form hirsute or hispidulous all over. 



Leaves in the terrestrial form, equally coarse-pubescent on both 



sides. 3a. P. pratincola. 



Leaves cauescent beneath, with a finer and denser pubescence than 

 above. 3b. P. vestita. 



236 After the key insert, instead of the first three species: 



1. P. psycrophila Greene. TERRESTRIAL FORM: Stem 3-6 dm. high, 

 decumbent at the base, glabrous; ochreae more or less muricate and 

 hirsute, loose, sometimes with a foliaceous spreading margin, hispid- 

 ciliate; petioles stout, 1-2 cm. long, sometimes hispid; leaf -blades lance- 

 oblong, acute at each end, 8-12 cm. long, 2-4 mm. wide; from glabrous 

 to sparingly appressed-setose above and on the margins, and hirsute on 

 the midrib beneath; peduncles terminal, 2-3 cm. long, glabrous; raceme 

 2-4 cm. long, 1518 mm. thick; bracts glabrous (very rare). P. muriculata 

 Greene. PALUDOSE FORM: Similar to the terrestrial one, but leaves and 

 ochreae glabrous, the latter usually without foliaceous border (rare). 

 AQUATIC FORM : Stem floating, 3-20 dm. long; ochreae loose, membranous, 

 usually glabrous, with a spreading membranous rim; petioles 3-4 cm. 

 long; leaf -blades oblong, acutish at each end or obtuse at the base, glabrous 

 and shining, 5-12 cm. long, 2-3.5 cm. wide; spikes as in the terrestrial 

 form, but the peduncles lateral (common). P. psycrophila Greene. P. 

 orcgana Greene. P. coccinea Rydb., mainly, page 236, not (Muhl.) 

 Greene. Water and wet places: Minn. Sask. B. C. Ore. Colo. Je-Au. 



la. P. fluitans (Eaton) Greene. TERRESTRIAL FORM: Stem erect, 

 3-5 dm. high, glabrous, striate; ochreae more or less hirsute and some- 

 what glandular-muricate, closely investing the stem, the lower short, 

 the upper more elongate, and with a spreading, foliaceous, bristly-ciliate 

 border; leaves spreading; petioles usually not exceeding 1 cm. long; blades 

 lance -linear, 8-15 cm. long, 2-3 cm. wide, acute at each end, glabrous or 

 nearly so, except the hispidulous-ciliate margins, and sometimes the 

 hirsute midrib beneath; peduncles 13 cm. long, glabrous or nearly so; 

 raceme oblong, 2-3 cm. long, 10-12 mm. thick; achenes ovate-lenticular, 

 black, shining, 2 mm. long (not common). P. Hariwrightii (A. Gray) 

 Greene. PALUDOSE FORM: Similar, but glabrous, the ochreae usually 

 without foliaceous margins and the leaf -blades shorter, with longer petioles. 

 AQUATIC FORM: Stem floating, 3-10 dm. long, glabrous; ochreae rather 

 loose, short, usually glabrous, wholly membranous; peduncles 3-5 cm. 

 long; leaf-blades oblong, usually acutish at each end, 5-10 cm. long, 2-3 

 cm. wide, dark green, shining, glabrous; inflorescence and fruit as in the 

 terrestrial form (common). Polygonum amphilium Am. auth., not L. 

 P.fluitansE&ton. Water and wet places: N. S. Sask. Minn. N. J. Jl-O. 



2. P. nebraskensis Greene. TERRESTRIAL FORM: Stem erect, 2-5 

 dm. long, glabrous or somewhat hirsute; ochreae usually copiously hirsute, 

 with dilated, foliaceous, hispid-ciliate border; petioles 1 cm. long or less, 

 hirsute; leaf -blades spreading, light green, more or less hirsute on both 

 sides, long-hirsute on the midribs beneath, lance-linear or lance-oblong, 

 5-13 cm. long, 1.5-3 cm. wide; peduncles 2-4 cm. long, glabrous or spar- 

 ingly hirsute; raceme oblong, 2-3 cm. long, 10-12 mm. thick; bracts 

 sparingly hirsute. P. nebrasccnsis, proper. P. ammophila Xieuwl. 

 scarcely Greene, a more robust form. PALUDOSE FORM: Similar but 

 glabrous or nearly so, especially below, where the ochreae are shorter 

 and without foliaceous border. P. nebrascensis Greene, in part. AQUATIC 

 FORM: Stem floating, glabrous; plant closely resembling that of P. 

 fluitans, but the leaves lighter green and rather dull (rare). Water and 

 wet places: N. Y. Ont. Mont, Utah. Ind. Jl-S. 



