COMPOSIT.E. 457 



J)5J. SOLIVA, Ruiz tt Pavon. Small depressed herb with rigid short 

 branches, petioled piunately dissected leaves, and heads of greenish 

 dowers sessile iu the forks. Involucre of 5 — 12 nearly equal bracts. 

 Receptacle flat. Outer and only pistillate flowers apetalotis, their 

 achenes pointed with the hardened and persistent style, obcompressed, 

 with rigid callous margins. Pappus none. 



1. S. sessilis, R. & P. Prodr. 113, t. 24 (1794). Plant depressed, sel- 

 dom 6 in. broad, villous or glabrate: primary divisions of the leaves 3 — 5, 

 petiolulate, parted into 3 5 narrow lobes: heads depressed: achenes 

 broadly obovate, tliiu-winged, the wings entire or panduriform-incised 

 near the base, spinulose-pointed at summit: persistent style long and 

 stout. — In moist open ground, or, less frequently, in shady places. May. 



94. COTULA, Linnxns. Low herbs with alternate lobed or dissected 

 leaves, and slender-peduncled discoid short-hemispherical heads. Outer 

 series of flowers pistillate only, and apetalous, the style deciduous. 

 Disk-flowers 4-toothed. Bracts of involucre greenish, iu about 2 ranks. 

 Mature achenes pedicellate, obcompressed, thick-margined or narrowly 

 winged, in ours nearly or quite destitute of pappus. Both species of 

 our flora supposed to have come from Australia, in recent times. 



1. C. coronopifoijIA, Linn. Sp. PI. ii. 892 (1753). Somewhat succu- 

 lent glabrous stoutish and decumbent usually subaquatic perennial: 

 leaves ligulate-liuear, laciniate-pinnatifid, or the upper entire, the base 

 clasping or sheathing: head much depressed, J;3 — % in. broad: pistillate 

 fl. in a single series, their achenes with a thick spongy wing: disk- 

 achenes with wing reduced. — Abundant in shallow pools and on muddy 

 banks of tidal streams; occasionally on higher lands; flowering through- 

 out the year. 



2. C. AUSTKALis, Hook. f. Fl. Nov. Zel. 128 (1853). Slender, not 

 fleshy, very diffusely branched: leaves bipinnately dissected into linear 

 lobes and somewhat pubescent: heads small; pistillate fl. in 2 rows, their 

 achenes pedicelled, those of the disk less so. — Plentiful in gardens, and 

 along some streets in San Francisco and elsewhere. Feb. — June. 



Suborder 9. Senecionide.e. 



Plants herbaceous or suffrutescent, mostly with watery juice, but 

 pungent; some genera bitter and aromatic. Bracts of involucre herba- 

 ceous, in 1 or 2 series. Receptacle naked. x\nthers not caudate; some- 



