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1. T. REPENS L. All peduncles axillary, 

 longer than the leaf. Petals white. — U- Com- 

 mon. Summer. 



2. T. Macr^i Hook. & Am. Heads not in- 

 volucrate; flowers sessile; petals dark purple. 

 0. Marin County. Spring. 



3. T. CILIATUM Nutt* Heads not involu- 

 crate; flowers shortly pedicillate; calyx teeth 

 lanceolate, rigid, ciliate at the bottom; petals 

 white or purplish. — 0. Common. Spring. 



4. T. GRACiLENTUM Torr. & Gray. Heads 

 not involucrate; flowers shortly pedicillate; 

 leaflets obovate; petal rose-color. — Common. 

 Spring. 



5. T. BIFIDUM Gray. Heads not involu- 

 crate; flowers shortly pedicillate; leaflets bifid 

 at the apex; corolla rose-color. — 0. Common. 

 Spring. 



6. T. INVOLUCRATUM Willd. Heads involu- 

 crate; involucre herbaceous, deeply lobed, the 

 lobes deeply dentate; corolla not becoming in- 

 flated; legume more than 4-ovulate; petals rose- 

 color. — 0. Common. Spring. 



7. T. TRIDENTATUM Lindl. Heads involu- 

 crate; involucre herbaceous, deeply lobed, the 

 lobes deeply dentate; corolla not becoming in- 

 flated; legume 1-2-ovulate; calyx teeth rigid, 

 abruptly narrowed into aspinulose apex; petals 

 considerably exceeding the calyx, purple with 

 paler or white tips. — ©. Common. Spring 



