174 PITTONIA. 
or less distinctly wrinkled, either naked or with a few bristly 
hairs. 
Oakland, 23 March, 1889, V. K. Chesnut in U. 8. Herb. 
17. P. anvorum. Rather loosely diffuse, a foot high, more 
or less, and slender, the leafy branches and their many 
peduncles of about equal height: leaves narrow, 14 to 3 
inches long, acutish and callous-tipped, only scantily and 
softly pilose, the peduncles more hirsute: corollas 1 inch 
broad, quite rotate, the petals obovate, the inner distinctly 
narrower, all yellow at tip, the yellow extending cuneately 
down to the base of the petal, leaving the broad margins of 
cream-color below the middle, deciduous: stamens very un- 
equal, the outer and shorter oblong-cuneiform, the anther 
sessile in a deep notch between acute lobes, the inner spat- 
ulate-linear, truncate under the anthers; fruits small, only 
} inch long, including the rather long filiform stigmas and 
short styles; carpels about 12, abruptly and deeply con- 
stricted, about 6-jointed, without midnerve and the pericarp 
pale, glaucous, thin, marked with thin wavy striæ, or these 
obscure. 
In sandy fields at Tracy, San Joaquin Co., 25 April, 1903, 
Carl F. Baker, who distributed it under n. 3199. Easily dis- 
tinguished from all others by its corolla and carpels. 
18. P. nigricans. About a foot high, the suberect leafy 
branches and the surmounting peduncles of about equal 
length: leaves thin, pale, 2 inches long, commonly with a 
hollow cupuliform callosity at tip, sparsely hairy above, 
remotely so on the margin, the hairs all slender: corolla 
barely an inch broad, saucer-shaped, cream-color, deciduous: 
stamens unequal, apparently all elongated and with fila- 
ments only moderately dilated above the middle, below 
linear-filiform: carpels about twenty, forming an ovoid fruit 
