14 PITTONIA. 
folium, Kell. Proc. Cal. Acad. ii. 103. fig. 51: Krynitzkia, 
Gray, Proc. Am. Acad. xx. 267; Syn. Fl. Suppl. 424. 
Common in moist grassy lands about San Francisco Bay. 
One of the very few species whose corollas are not minute 
but large enough to be showy ; easily distinguished from all 
the others by its conspicuously pedicelled flowers. Its affinity 
with A. lithocarya is indicated even in the nutlets, the lateral 
angles of which are drawn forward very close to the ventral 
keel, forming a groove along it, although not enclosing any 
part of it 
4. A. DIFFUSA. Pubescence light, closely appressed : 
branches procumbent, a foot or less in length, loosely race- 
mose from the base, the raceme leafy to the middle at least ; 
lowest pedicel a half-inch long, the others hardly a line: 
calyx widely spreading, corolla small: nutlets dark brown, 
broadly ovate, ineurved, 3-line long, ventrally carinate down 
to the supra-basal, oblong-lanceolate scar, the back with rather 
sharp granulations and rug:e, the latter favosely confluent. 
an Francisco, in grassy lands about the U. S. Marine 
Hospital, April, 1886. In habit most resembling A. Chori- 
siana, but the corolla minute and pedicels very short. Nut- 
lets, with their sharpened rugs and granulations, inclining 
toward those of the species which immediately follow. 
5. A. TRACHYCARPA. Size and habit of the last, but more 
.  branehing and decumbent rather than proeumbent, rough 
with a coarser and somewhat spreading pubescence : racemes 
less open, leafy almost throughout : segments of calyx linear, 
widely spreading: corolla very small: nutlets ovate, straight, 
carinate on both sides, the dorsal keel and nearly straight 
transverse rug: dentate-interrupted ; sear suborbicular, nearly 
basal.—" Krynitzkia trachycarpa, Gray, Proc. Am. Acad. l. e. 
3% A. ULIGINOSA. Stem erect, a foot or more high, simple below, where 
it is elothed with many pairs of connate-sheathing leaves: pubescence 
short and very sparse except on the calyx, closely appressed : racemes 
several, naked, rather dense; lowest pedicels 2 lines long, the rest 1 line 
