29 



NEW SPECIES OF WASHINGTON PLANTS. 



By C. V. Piper. 



Trifolium caurinum. Perennial from tuberous (?) roots; 

 stems solitary, simple, erect, rather slender, striate 1-3 dm. high 

 glabrous below, very sparsely pubescent above with weak whitish 

 hairs; leaves long-petioled ; leaflets three, thin, oval, entire, obtuse 

 at apex, with or without a short mucro, obtuse, usually cuneate y 

 so, at base, glabrous above, sparsely hirsute beneath especially 

 along the midrib, very shortly petiolate, 3 cm. or less long; veins 

 conspicuous; stipules entire, the lower lanceolate, acute adnata 

 to the petiole except at the tip, the upper ovate, acute, adnata for 

 only half their length: peduncle well exceeding the leaves; heads 

 2-3 cm. long, subglobose, 25-40 flowered, not involucrate ; flowers 

 whitish, on pedicels 2 mm. long, somewhat deflexed in age: calyx 

 hirsute with white hairs, the tube oblique campanulate about 2 mm. 

 Ion., 10-nerved ; teeth narrowly linear, acuminate, the three anterior 

 8-8* mm. long, the posterior two 2 mm. long, not longer than the 

 tube • corolla about 10 mm. long, much exceeding the calyx, glab- 

 rous the wing and keel petals united at base; pod stipitata con- 

 taining when immature 3-5 ovules, of which probably only one 

 develops into a seed; style glabrous. 



Big Creek Prairie, alt. 2,500 ft., Chehalis County, Washington, 

 August 1, 1897, F. H. Lamb, 1395. A species related to T. 

 eriocephalum Nutt., and T. longipes Nutt. but very distinct from 



b °Peucedanum confusum. Stems 8-12 cm. long from a deep- 

 seated globose tuber, which is more or less covered with clusters 

 of rootlets* leaves all radical, once or twice ternate, the segments 

 all more or less lobed, the final divisions linear and usually short; 

 petioles all dilated: umbel very unequally 2-5 rayed, the rays 

 short, in fruit 2 cm. or less long; involucels of 2-5, minute, linear 

 white margined bracts; flowers white with purple anthers, 10-20 

 in each umbellet: fruit oblong, puberulent, 6 mm. long by 3-% 

 mm wide, on short pedicels ; wings.nearly as broad as the body ; oil 

 tubes frequently wanting and when present minute or rudimentary; 

 Erythea, Vol. VI, No; 4 [10 April, 1898]. 



