POLTGONAOEOUS GENBBA. 19 



or short-cylindric ; bracts ovate-lanceolate, caudately pointed : 

 flowers at first white, changing in age to lilac-purple. 



In the mountains near Pagosa Peak, southern Colorado, at 

 13,500 feet C. F. Baker, 28 Aug. 1899 ; distributed for Polygonum 

 bistortoides ; resembling B. Hnearifolia and with leaves quite as 

 narrowly linear, but otherwise very different. 



B. CALOPHTLLA. About 2 feet high, the lowest leaves about 

 10 inches long including the 3 -inch petiole, all from a short 

 stout contorted and fiber-bearing root : blades of leaves oblong 

 and elliptical, fiat even to the slightly wavy margin, glabrous 

 throughout, very bright-green above, glaucous beneath, with 

 broad flat striate midvein and obvious though delicate feather- 

 veins : ocrese li^ to 2 inches long, ending in a short scarious rim 

 and a rather large oblong-lanceolate spreading leaf : spik jvoid 

 to subcylindric, 1 to 2 inches long ; lower bracts round-obovate 

 and toothed, the upper narrower and acuminate : flowers milk- 

 white, drying cream-color. 



Subalpine in the mountains of southern Colorado; Baker, 

 Earle and Tracy's 373 from 9,000 feet on Chicken Creek, and 

 Bakers n. 293, from near Pagosa Peak at 10,500 feet are the 

 types; the species noteworthy by its large handsome foliage, 

 and recalling the far northwestern B. glastifolia which has a 

 much firmer foliage reticulate-venulose, and underneath lepidote- 

 puberulent. 



B. LITTOEALIS. Allied to B. vivipara but large, nearly 3 feet 

 high, the rather slender stem and long leaves from a thick hori- 

 zontal bent rootstock : lowest leaves a foot long, the petioles 

 rather longer than the linear or lance-linear blades, these subco- 

 riaceous, abruptly acute at both ends, glabrous on both faces^ 

 very glaucous beneath, the midvein thick but rounded, not fiat 

 and striate : spikes 3 to 4 inches long, bulbilliferous only at and 

 near the base: bracts subreniform-ovate, toothed across the 

 broad summit and with a short subaristiform acumination. 



Shores of Yes Bay, Alaska, 30 July, 1895, Thomas Howell, 

 n. 1048 in my set of his plants. The large very sharply out- 

 lined coriaceous leaf -blades strongly recall the fronds of some 

 simple-fronded ferns, both by outline and the venation. 



B. OPHIOSLOSSA. Stems several, very erect, 4 to 6 inches high 



