KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 91 



sponds with this species as to the development of buds, usually taking place in the 

 tops of the long branches; but branches in bud-state, too, are rather often trans- 

 formed into such turios. As to shape they almost entirely resemble the buds of P. 

 pusillus. The difference lies in the ligules here being stronger, and in the outer leaves, 

 endowed with a more conspicuous and acute cusp than in P. pusillus. As to size 

 they vary with the plant itself, so that slender forms have slender turios. 



MoRONG calls P. foliosus »a variable species^ (Naj. 1893, 39). This is true, but 

 the variations only concern the magnitudinal conditions and I scarcely understand how 

 to establish a real difference between the two Morongian varieties niagarensis and cali- 

 fornicus. Both are of tall growth and furnished with broad, 3— 5-nerved leaves. The 

 only real difference might be that the former has a little longer stem ()i>2 — 3 feet>) 

 and somewhat longer leaves (^sometimes over 3 in. long»)- The statement on the 

 latter that the stem is a little winged and that the midrib of the leaf is like that 

 of P. obtusifolius is either an erroneous observation or a misprint, perhaps both of 

 these. Instead of P. obtusif. there should stand P. mucronatus. And as to the stem 

 of this species it always has rounded margins. It is only in the plant-press the 

 stem sometimes becomes falsely winged. 



Distribution. N. America, Pine Plains, N. Y., Hoysradt, »ex hb. Robbins» 

 (hb. Stockholm.), In lacu Fresh, Mass., Robbins (hb. Stockholm.), Campden N. Yersey, 

 Parker (hb. Stockholm.), In lacu Molare ad Hubbardston, Mich., Wheeler (hb. 

 Stockholm.), f. calif amicus ; Eastern Mass., Morong (hb. Uppsal.), Nova Scotia, 

 Howe et Lang (hb. Uppsal.), Nov. Angl., Tuckerman (hb. Uppsal.), Niagara, Tucker- 

 man (hb. Uppsal.), i>P. niagarensis TucK.»; West Chester. Penn., W. D. (hb. Lund.), 

 f. niagarensis ; Wisconsin, Lapham (hb. Uppsal.), Washington, 79, Ward (hb. Uppsal.), 

 Wisconsin, Ktjmlien (hb. Uppsal.), f. niagarensis; Englewood, 111., Morong (hb. 

 Uppsal.), Yellostone Park, 88, Knowton (hb. Uppsal.), Colorado, 95, Baker (hb. 

 Stockholm.), San Bernidino, California, 82, Parish (hb. Stockholm.): stem-leaves 

 1,6—2 mm broad, 45 — 55 mm long, spike 4-f lowered; Portorico, Guajataca, Sintenis 

 (hb. Stockholm.), Cuba, 1860 — 64, Wright (hb. Stockholm.), Jamaica, Svv^artz (hb. 

 Stockholm.). — Mexico, Mecapulco, 41, Liebmann (hb. Haun.). — Canada, B. C, 

 Manitoba, Ont. (hb. Haun.). 



P. foliosus Raf. X pusillus L. n. hybr. — P. turionifer Hagstr. 



Caulis filiformis, ramosus uti parentes. Folia quoad formam apicis ut in P. 

 pusillo, quoad nervaturam et structuram iis P. foliosi similia, vel in p quoad formam 

 apicis ut in P. fol., quoad struct, et nerv. ut in P. pusillo. Ligulee fissse biglandulosse. 

 Pedunculus brevissimus (5 — 10 mm), Spica parva sterilis. Hybernacula in apicibus 

 ramorum iis P. pusilli simillima. 



The main-form reminds very much of P. pusillus and should be called a mucro- 

 nulatus n. f. — p tenuis n. f., is a slender form occurring in Cache Lake and Opeongo 

 Lake, Ont. 



Hab. of a: Brigham'sCreek, Ottawa, Ont., Canada, 1. Macoun7» 00 (hb.Hauniense). 



