220 PITTONIA. 
SENECIO APHANACTIS. Annual, slender, 2 to 5 inches high, 
slightly arachnoid about the inflorescence, otherwise glabrous, 
scarcely viscid, scentless: leaves $ to 3 inch long, somewhat 
fleshy, firmly erect or ascending, the lowest linear-spatulate, 
entire, lower cauline from linear to oblong in outline, coarsely 
toothed or simply lobed : heads very small, 2 or 3 terminating 
the simple stem, or as many at the end of each of the 2 
or 3 lax branches :. involucre subtended by 2 or 3 minute 
braetlets, its proper scales linear-acuminate, without black 
tips : rays about 5, minute, recurved : achenes appressed-silky- 
canescent.— S. sylvaticus, Gray. Bot. Cal. i. 410, not of Linn. 
Indigenous and rare on clayey or gravelly open hill-tops of 
the Mt. Diablo Range in central California. Most related to 
the eommon S. Californicus, and, although heretofore inad- 
vertently allowed to pass as if a mere depauperate state of 5. 
sylwaticus introduced from the Old World, it is very unlike 
that speeies in most respects; for that is a rank gummy ill- 
scented coarse weed, with flaccid and spreading divided and 
subdivided ample foliage, and a large terminal corymb of 
heads which have twelve to fifteen not inconspicuous rays ; 
its achenes not silky-canescent, but powdery-puberulent. I 
have collected S. aphanactis only twice in all my years in Cali- 
fornia: once, in 1874, on the clayey and barren southern 
escarpment of Mare Island in San Francisco Bay, and again, 
in March of this year, in similar ground, near Byron Springs 
east of Mt. Diablo. 
SENECIO HYDROPHILUS, var. Pactricus. Stouter than the 
type, with more and ampler radical, and fewer cauline leaves: 
heads about twice as large and wholly destitute of rays: 
inflorescence very pronouncedly, and in age loosely, cymose- 
corymbose (that of the type being thyrsoid-paniculate). 
Frequent in either fresh or brackish marshes near the Bay 
of San Francisco: so unlike the typical plant of the far off 
interior of the continent, that it may eventually be concluded 
specifically distinct. The stems are clustered, decumbent at 
base, of a rich red-purple covered with bloom, and, occupying 
