32 BOTANICAL GAZETTE. 



to ;x striking variety of our Chrysogonum, which grows apparently 

 intermixed with the ordinary form. The low and subcauleseent 

 forms of the two appear to he nearly alike. But in the well devel- 

 oped and taller forms, rising to a foot in height, the difference is 

 that this var. dentatum has the leaves strongly serrate (instead, of 

 crenate), all the upper ovate and acute, the base not cordate, the 

 teeth callous-mucronate, and a very pronounced callous mucro 

 makes a conspicuous point to the involucral bracts. It is found on 

 High Island in the Potomac, Maryland, and was first received from 

 Mr. J. Donnell Smith, who collected it in June, 1881. Specimens 

 from the same locality collected in May and June, 1879 and 1880, 

 by Mr. L. F. Ward and Dr. Vase}', communicated by them, exhibit 

 these characteristics in a less degree, and show that we have to do 

 with only a marked variety. — A. Gray. 



Some New Grasses.— Poa pulchella.— Culms eespitose, de- 

 cumbent at the base, from a much branched rhizome, the base 

 crowded with the short almost filiform leaves which are seldom 

 more than 1 inch long, with somewhat broadened and thickened 

 bases; culms slender, smooth, erect, 4 to 6 inches high, with 1 to 2 

 short leaves, the blade i inch long or less, ligule 1 line long, mem- 

 branaceous, obtuse; panicle 1 to li inches long, 1 inch wide, erect, 

 the lower branches in pairs, spreading, smooth, capillary, each with 

 a single spikelet; spikelets purplish, 3 to 4 lines long, large for the 

 size of the plant, 3 to 5 flowered ; lower glumes about 1 line long, 

 3 nerved, smooth, mostly obtuse or somewhat erosely dentate, 

 broadly scarious margined; flowering glumes about 2 lines long, 3 

 nerved, lanceolate, the upper ones a little acutish, the lower obtuse 

 with scarious apex, finely scabrous on the keel and nerves, but not 

 pubescent nor webbed at the base; lower palet about equaling the 

 fl. glume strongly bidentate, and scabrous on the conspicuous 

 nerves. 



A handsome dwarf Poa, related to P. laxa but distinct, found 

 by Mr. W. N. Suksdorf, on the Columbia river, from near the river 

 bank to the summit of the hills (2,000 ft.). 



Poa Bolanderi. — Culms 1 to li ft. high, erect or somewhat 

 geniculate below, with 3-4 conspicuous rather short and broad 

 leaves (2 to 3 inches by 2 lines); sheaths striate, smooth, loose, lig- 

 ule membanaceous, obtuse; panicle 4 to 6 inches long, the rays 1£ 

 to 2 in., distant, mostly in pairs, frequently with 2 to 3 additional 

 short ones, at first erect and appressed, becoming horizontal or 

 reflexed, the longer ones 2-3 inches long, slender, mostty flowering 

 near the extremities, the bran chiefs appressed and short pedicelled ; 

 rachis and rays smooth, spikelets 1 to 3 flowered, often only 1 

 flowered; outer glumes thin, green, scarious margined, the upper 

 about 1 line long, lance-oblong, 3 nerved, frequently lacerate at the 

 apex, the lower about one-third shorter and acuter; flowering 

 glumes \\ lines long, rather faintly 5 nerved, lanceolate, acute 



