86 CALIFORNIA ACADEMY OF SCIENCES. 



of the region of San Francsico and northward to Mendocino 

 County; only half the size of those of § 1. 



* Stems simple, or with few erect or ascending branches: heads 

 12 —  2 ~> -flowered: pappus bristles 5, when present. 



h— Heads with white ray- and yellow disk-flowers. 



P. bellidiflora. 



Herbage green: peduncles glabrous: throat of corolla am- 

 ple, not contracted above. — P. aurea, Gray, Pacif. R. Rep. 

 IV. 99, Boland. Cat. 15, not of Nutt. P. exilis, Gray, Bot. 

 Cal. 1. c. and Syn. Fl. 1. c. excl. vars. but not Aphantoclueta 

 exilis. 



A plant of limited range, being confined, apparently, to 

 the immediate vicinity of San Francisco Bay, and seldom 

 collected. Still found at Corte Madera, in Marin County, 

 the original locality. Bolander's specimens from Crystal 

 Springs, a little south of San Francisco, are destitute of 

 pappus, but otherwise the same. 



-t — h Heads discoid: corollas red-purple, 



P. exilis. 



Herbage purple; peduncles white-villous under the invol- 

 ucre; throat of corolla contracted at the base of the minute 

 teeth. — Aphantochaita exilis, Gray, Pacif. R. Rep. IV. 99, t. 

 11. P. exilis, var. aphantoclueta, Gray, Bot. Cal. I, 305, 

 Syn. Fl. 1. c. P. aphantochaita, Greene, Bull. Torr. Club, 

 IX. 109, & Bot. Gaz. VIII. 256. 



A most common species in the counties eastward and 

 northward from San Francisco. Very distinct from the 

 preceding. 



* * Stems diffuse, much branched: heads in the forks, shoil- 

 peduncled, 3 — 7-floivered: rays wanting. 



P. alsinoides, Greene. 



Corollas filiform; tube scarcely widening into a throat, 



