

New and noteworthy Northwestern Plants. — V. 



By C. V. Piper 



Arabis Whitedii 



Perennial from a simple or more or less branched caudex, the 

 tap-root rather slender : flowering stems one to several, usually 

 few-branched from the lower part, sparsely and rather coarsely 

 stellate pubescent throughout, but the plant greenish in appear- 

 ance : branches erect, yirgate, in fruit 2-5 dm. long : radical leaves 

 tufted, oblanceolate or spatulate, entire or with a few coarse teeth, 

 mostly obtuse, equally pubescent on each side, 2-6 cm. long, the 

 margined petiole about equaling the blade : cauline leaves several, 

 sessile, not auriculate, 2-4 cm. long, oblanceolate, obtuse, mostly 

 entire : flowers white, at length forming racemes 2-3 dm. long, 

 the pedicels 1 cm. long, spreading : sepals greenish, 3 mm. long : 

 petals white, obovate, oblong, obtuse, usually faintly dentate at 

 apex : filament narrowly triangular, broader than the anthers : 

 stigma bilobed : pods striately erect, stellate, 2-3 cm., long, 1 mm. 

 wide, the style short and stout, the seeds making prominent 

 swellings : perfectly formed mature seeds not seen. 



Type specimens collected at Wenatchee, Wash., by Whited, 



no. 1057, April and May, 1899; also collected by Sandberg & 

 Leiberg, no. 275, at Junction of Crab and Wilson Creeks, Duylos 

 Co., Wash., June 22, 1893. Nearest A. Nuttallii Rob. 



y 



Trifolium arcuatum 



Stems one or several from a stout vertical root, erect or some- 

 what divergent, simple, striate, terete, nearly glabrous or the 

 whole plant weakly hirsute, 2-3 dm. high : cauline leaves two or 

 three, the leaflets elliptic or oblong, obtuse, 1-3 cm. long, 

 usually shorter than the petioles ; leaflets of the radical leaves 

 shorter and broader, sometimes retuse ; all minutely serrulate or 

 the lower nearly or quite entire ; stipules large, 1-3 cm. long, 

 lanceolate, adnate for two thirds their length, entire or nearly so : 

 heads globose, 1-3 cm. in diameter: flowers numerous, ochro- 

 leucous, soon reflexed, 10-12 mm! long, nearly sessile : calyx-tube 

 campanulate, 2 mm. long, the anterior lobe about twice as long, 

 the four others scarcely exceeding the tube, all linear-subulate, 

 more or less strongly curved especially at the tip : corolla about 

 1 2 mm. long, three times as long as the longest calyx-lobe : ovary 



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