NEW OR NOTEWORTHY SPECIES. d 
easily distinguished from the rigidly upright purple-stemmed 
rose-purple-flowered T. tridentatum form of those districts by 
its weak half reclining habit, green herbage and dull flesh- 
colored or whitish flowers. Occasionally the peduncles show 
some of that muriculation which more distinctly marks the 
rare T. scabrellum. This last I still know only from the 
subsaline flats of Tulare County. 
TRIFOLIUM sEGETUM. Annual, glabrous, tall and stout, 
the hollow stems often } ingh in diameter and 2 feet high : 
lowest leaves oblong-cuneiform, retuse, 5 or 6 lines long, the 
_others linear-lanceolate, acute, | or 2 inches long, serrulate: 
heads oval in maturity, an inch high, the lacerate involucre 
somewhat lobed : calyx 10-nerved, and its upper parts much 
reticulated, the somewhat quadrate-ovate lobes with a short 
awn and occasionally a tooth or two at its base: corollas 4 
inch long, light rose-red with a purple spot. 
Common in dry open grounds in middle California ; 
usually seen at its best in fields among the ripening grain. 
The plant is even larger than T. obtusiflorum and T. majus, 
and not susceptible of being confused with either. It has 
nothing of the bright green somewhat resiniferous herbage, 
or fringed leaf-margins of T. majus, nor of the hairiness of 
T. obtusiflorum ; and the calyx in both those species is 20- 
nerved, in this most strictly 10-nerved; in view of which 
character I had always referred it to T. tridentatum, to which 
it is truly allied. 
Trirotium FExpLERI Perennial, glabrous, low, matted 
and only a few inches high, or taller and decumbent: leaf- 
lets of the lowest leaves smaller and obcordate, or obovate 
and emarginate, the middle cauline 4 to inch long, obovate- 
oblong, very obtuse, the uppermost usually oblanceolate, 
acute, all very minutely serrulate : heads slender-peduncled 
and large, 1 inch in diameter; involucre many -lobed and the 
lobes not deeply lacerate: corollas crowded in the hemi- 
spherical head, } inch long, narrow, white or merely pink- 
