28 Muhlenbergia, Volume 9 
TRIFOLIUM OLIVACEUM Greene 
A striking annual, appearing glabrous, but strongly ap- 
pressed pubescent throughout undera lens. The strongly nerved 
calyx tube and rigid teeth tinged with purple give it a harsh 
appearance, unlike any other species of the group. The flowers 
are at first deep purple, never conspicuous, and always much 
shorter than the calyx teeth. The heads are olive green, not 
silver gray as in columbinum. It was apparently first collected 
by Kellogg and Harford, no. 7go, in 1868 or 1869, the exact 
locality in California not given. This specimen is in the her- 
barium of the Missouri Botanical Garden, determined as 7. plu- 
mosum, and later as 7. Macraet. 
Annual, erect, with ascending branches, silky appressed pu- 
bescent throughout, sparsely so on the stems: internodes 4 to 8 
em. long: lower leaflets obovate-cuneate, emarginate dentate, 
1cm. long, soon drying up; upper ones longer and narrower, 
variable, obovate-cuneate to oblong and oblanceolate, mostly 
obtuse, dentate, about 2cin. long; petioles 3 to 5cin. long, upper 
ones much shorter: stipules membranaceous, lobes lanceolate to 
ovate with a long acumination, more or less notched: peduncles 
7c. long: flowers inconspicuous: heads terminal or subtermi- 
nal, one or two on each branch, globose, inclined to ovate coni- 
cal in fruit,r cm long and as wide, villous: calyx tube short, 
2mm. long, teeth setaceous, g or 10mm. long, villous below, 
becoming almost naked toward the apex, rigid and usually pur- 
ple tinged: corolla deep violet purple, inconspicuous, reaching 
to about half the length of the calyx teeth; vexillum oblong, 
uarrow, 8mm. long, 2.5 mm. wide, obtuse, apex irregularly den- 
tate: ovary pilose, 2-ovuled: style 4.5mm. long: legume mem- 
branaceous, glabrous except for a few hairs on the dorsal suture 
near the apex, light colored, striate, 3.5mm. long, 2 mm/wide, 
1-seeded: seeds oval, 2mm. long, 1mm. wide, light veTlowish 
brown, with a few dark markings at one end. 
Solano county: Near Vacaville, Heller and Brown 5394; 
Vanden, A’ennedy, May, 1907. 
Napa county: Near Napa, Heller and Brown 5359. 
Contra Costa counjy: Antioch, Mrs. Brandegee, May, 1907. 
California, Ke//agge and Harford 1yo, 1868-69. 
