ASTEKACE^. 177 



and green-herbaceous almost throughout, the inner acutish and with a 

 green mid vein : rays short: achenes pubescent. On bluffs near the sea 

 at Point Lobos; also in the Mission Hills. Aug., Sept. 



13. PEXTACHJ2TA, Nutt. Slender almost glabrous small vernal 

 annuals. Leaves alternate, linear, entire. Involucres solitary, hemi- 

 spherical or campanulate, of thin scarious-margined appressed mucronu- 

 late bracts in 2 series. Bays white, yellow, or wanting. Disk-corollas 

 yellow, very slender. Style-appendages filiform-subulate, hispid. 

 Achenes pubescent. Pappus of 3 5 slender bristles. 



1. P. bellidiflora, Greene. Sparingly branching, the peduncles 

 somewhat scapiforni: involucre hemispherical, many-flowered: rays 8 14, 

 white or reddish; achenes oblong- turbinate, villous: pappus-bristles 5 or 

 none. Open hills and sterile slopes in Marin and San Mateo counties, 

 not common. April, May. 



2. P. alsinoides, Greene. Dichotomously branching, only 25 in. 

 high: involucre turbinate, of 5 7 bracts and 3 7-flowered: rays 0: disk- 

 corollas filiform, not deeply cleft: achenes obovate-clavate; pappus-bristles 

 3, very slender. An obscure hillside plant, but not rare. April June. 



3. P. exilis (Gray), Greene. Very slender, only 23 in. high, usually 

 simple and monocephalous : whole plant purplish, the peduncle white- 

 villous under the small head: outer series of corollas rose-red, claviform- 

 urceolate, i. e., widening upwards, the throat abruptly contracted under 

 the minute teeth: pappus of 3 5 short bristles or cusps, or obsolete. 

 Frequent on open hills in San Mateo and Contra Costa counties, thence 

 northward. April, May. 



14. BELLIS, Pliny (DAISY). Low herbs. Involucres broad, many- 

 flowered; bracts of nearly equal length. Rays many, white or reddish. 

 Disk-corollas yellow. Style-appendages short, triangular. Achenes 

 obovate, compressed, nerved on the margins. Pappus none. 



1. B. PERENNIS, L. Perennial, acaulescent: leaves obovate: scapes 

 several, each with a single head. Escaped from gardens, and naturalized 

 in the seaboard counties from at least Marin northward. 



15. LESSINGIA, Chamisso. More or less floccose-woolly annuals 

 with alternate more or less serrate leaves and small cymosely panicled 

 heads of yellow, whitish or purplish flowers, these all perfect. Corollas 

 with slender tube and long narrow lobes; those of the marginal row 

 more deeply cleft on one side and imitating a palmatifid ligule. Involu- 

 cre campanulate or turbinate; bracts much imbricated and appressed, 

 herbaceous-tipped. Anthers with slender-subulate appendages. Append- 

 ages of style-branches obtuse or truncate, densely hispid, often with a 

 setiform cusp amid the hairs. Achenes turbinate or cuneiform, silky- 

 villous. Pappus-bristles rigid, scabrous, red or brownish. 



