100 LEAFLFTS. 
At 8000 feet in the Soldier Mountains, Idaho, L. F. Hender- 
son, 16 July, 1895. U.S. Herb. Species curiously simulating 
in a degree, the common Chickweed. 
+ + Pubescence spreading. 
6. A. costaTa. Low, stoutish, rather rigidly ascending, 
much branched and with short internodes twice exceeded by the 
firm light-green ascending foliage; stem with hirtellous and 
gland-tipped hairs intermixed, none retrorse: leaves oval to 
ovate-elliptic, faintly feather-veined, scabro-puberulent above, 
almost hirtellous beneath, minutely and closely hispid-ciliolate ; 
inflorescence terminal and contracted, pedicels less than 4 inch 
long: calyx-tube 10-ribbed; teeth ovate-deltoid, acute or acum- 
inate: lobes of petals broad, each with a lateral tooth. 
Extreme northern California and adjacent Oregon. Species 
based primarily on my n. 900 from Yreka as in my own herbar- 
ium. I have it also from Butte Co., by Mrs Austin, and 
Kellogg & Harford’s n. 83 from Oregon may in part be referred 
here. It is the only species in which ten quite prominent ribs 
occur in place of the usual nerves or angles of the calyx. 
7. A. Noposa. Stems 6 or 8 inches high, much branched 
dichotomously from toward the base, all the internodes slender 
but the nodes more than usually swollen, the many flowers borne 
above the main foliage: leaves 1 to 14 inches long, firm, spread- 
ing, elliptic-lanceolate, acute, sparsely beset on both faces and 
more closely so on the margin with spreading mostly gland-tip- 
ped short hairs, the stems more densely so clothed and with no 
retrorse pubescence: slender pedicels and rather long calyx vis- 
cid-hirtellous, teeth of the latter deltoid and short: corolla 
large for the plant ; lobes of petals oblong, obtuse. 
Wenatchee, eastern Washington, in damp ground along Beaver 
Creek, Kirk Whited, 17 Jaly, 1896, U. S. Herb. 
8. A. MACILENTA. Herbage of a vivid green, thin and deli- 
cate intexture, but the plants large, a foot high or more, branched 
from the base, amply leafy and loosely floriferous; the stem with 
no retrorse pubescence, scantily and delicately hirtellous and 
