SPECIES OF TRIFOLIUM. T 
the sniall keel and wings deep purple: petioles far exceeding 
the leaves. 
T. prvERSIFOLIUM, Nutt. Pl. Gamb. 152? Branches a foot 
or two long, stout but weak and mostly procumbent: involu- 
cre with 5—6 oval lobes much shorter than the ealyx: heads 
many-flowered : corolla twice as large as in the preceding, in 
age oblong-oval narrowed about equally at each end, very 
conspieuously striate : pod long-stipitate, 2-seeded. 
Not common, and known to the writer only from brackish 
marshes bordering San Francisco Bay. It was collected in 
San Francisco by Dr. Kellogg in May, 1878, and by myself at 
the following times and places: near Vallejo, 1882: at 16th 
Street Station, Oakland, April 30, 1883: at Belmont, thirty 
miles south of San Francisco, May 9, 1886. The flowers in 
this are always bright purple throughout, and the petioles 
are but little longer than the leaves. Even if it grew away 
from the salt marshes and with 7. amplectens, which it never 
does, it would be recognizable at a glance as distinct, by its 
twice larger and altogether differently inflated mature corollas. 
There can hardly be a doubt that this is Nuttall’s plant. 
T. LACINIATUM. Stems and span long, slender and pros- 
trate: leaflets oblong to linear, truncate and mucronulate at 
apex, coarsely laciniate-toothed or even lobed to the middle, 
of thin texture, with a prominent vein running to the apex of 
each lobe, the body of the leaflet distinctly reticulate-venu- 
lose; stipules very thin and searious, scarcely even veined : 
peduneles filiform, assurgent, 3—6-flowered, the involueral 
rim entire and searious: calyx very thin and scarious, even 
to the teeth, the upper pair of which are obsolete, the lower 
three equal, triangular-subulate ; pod long-stipitate, 4-seeded, 
quite filling, lengthwise, the linear-oblong, inflated corolla- 
tube; seeds corrugated. 
Subsaline or alkaline flats of the lower San Joaquin Valley, 
near Byron Springs, Contra Costa County, eolleeted only by 
the writer, April 1884. Closely akin to what we eall T. depau- 
