222 NORTH AMERICAN FLORA [VoLUME 34 
2.5-3 mm. long; disk-flowers 20 or more; corollas cream-colored, 3 mm. long; achenes 2 mm. 
long, slightly margined. 
TYPE LocaLity: Sandhills at the upper end of Bodega Bay, Sonoma County, California. 
DISTRIBUTION: Coast and islands of California; apparently also in subalpine situations, Nevada 
County, California, and on Vancouver Island. 
7. Achillea subalpina Greene, Leaflets 1: 145. 1905. 
Achillea lanulosa alpicola Rydb. Mem. N. Y. Bot. Gard. 1: 426. 1900. 
Achillea alpicola Rydb. Bull. Torrey Club 33: 157. 1906. 
Achillea Millefolium alpicola Garrett, Spring Fl. Wasatch Reg. 101. 1911. 
A low perennial, with a creeping rootstock; stem 1-3 dm. high, striate, sparingly villous, 
simple; leaves 5-10 cm. long, 4-10 mm. wide, bipinnatifid, sparingly villous, the lower linear, 
oblanceolate in outline and petioled, the upper sessile and linear; primary divisions ovate 
in outline, short, usually ascending and crowded, the ultimate ones lanceolate or lance-linear, 
spinulose-mucronate; heads not numerous, in small congested, round-topped corymbs with 
short branches; involucre campanulate, 3.5-4 mm. high and about 3 mm. broad, sparingly 
villous; bracts about 20, in 4 series, the outer ovate, the inner elliptic, all obtuse and with dark- 
brown or almost black margins; ray-flowers 5; ligules suborbicular, round-lobed, 2-3 mm. long, 
white or pinkish; disk-flowers 15-20; corollas yellowish-white, 2.5 mm. long; achenes 2 mm. 
long, narrowly margined. 
TYPE LOCALITY: Subalpine slopes of Mount Ouray, Colorado. 
DISTRIBUTION: High mountains, from Hudson Bay and Alberta to New Mexico, California, 
British Columbia, and Yukon; Gaspé Peninsula, Quebec. 
8. Achillea laxiflora Pollard & Cockerell, Proc. Biol. Soc. Wash. . 
15-9 S902: 
A stout perennial, with a rootstock; stem about 5 dm. high, glabrous or sparingly villous; 
leaves coarsely pinnatifid, the upper 5-6 cm. long, glabrous; divisions cleft or lobed; rachis 
conspicuously wing-margined; ultimate divisions lance-linear, acute; heads numerous, in 
loose corymbs, long-peduncled; involucre turbinate, about 8 mm. high and 6 mm. broad; 
bracts about 25, in 4 series, scarious, with green keel, the outer acutish, ovate, the inner obtuse 
or rounded at the apex; ray-flowers about 5; ligules white, suborbicular, about 5 mm. long; 
disk-flowers 40 or more; corollas 3 mm. long, yellowish-white; achenes linear, prominently 
winged towards the apex. 
TYPE LOCALITY: Sandia Mountains, New Mexico. 
DISTRIBUTION: New Mexico and northeastern Arizona. 
9. Achillea californica Pollard, Bull. Torrey Club 26: 369. 1899. 
Achillea Millefolium f. californica H. M. Hall, Univ. Calif. Publ. Bot. 3: 211. 1907. 
A robust perennial, with a creeping rootstock; stem 5—10 dm. high, usually branched above, 
striate or sulcate, villous, especially above, with long hairs; leaves numerous, bi- or tri-pinna- 
tifid, sparingly villous, the lower petioled, 10-15 cm. long, 2-3 cm. wide, the upper sessile 
and clasping, lanceolate in outline, 1-2 cm. wide; rachis merely margined; primary divisions 
ovate in outline, spreading, the ultimate ones linear or lance-linear, spinulose-tipped; heads 
numerous, in compound corymbiform panicles; involucre 5-6 mm. high, 4 mm. broad, rather 
densely villous; bracts about 20, in 4 series, all obtuse or rounded at the apex, the outer oval, 
the inner oblong; margins brown; ray-flowers 5 or 6; ligules white, orbicular or rounded- 
oval, 3-4 mm. long; disk-flowers 25-30; corollas 3 mm. long, yellowish-white; achenes 2 mm. 
long, thick-margined. 
TYPE LOocALITy: Sea coast at Santa Isabel, California. 
DistRIBuTION: California to Washington and Idaho. 
10. Achillea pacifica Rydberg, sp. nov. 
A stout perennial, with a creeping rootstock; stem 3-7 dm. high, sulcate, usually decidedly 
long-villous, simple or branched above; leaves 1-2 dm. long, 5-10 mm. wide, linear in outline, 
