276 University of California Publications in Botany. [VOL. 3 



fruit expanding and forming a globose head, the bracts of the 

 involucre then reflexed. 



The reinstatement of the genus Agoseris Raf. (1817) has been 

 proposed for those species of Troximon in which the achenes are 

 beaked. But the two groups are best received into one genus, 

 being connected by the thick-beaked T. glaucum. Troximon was 

 first used as a generic name by Gaertner (1791), but since his 

 genus is not sustained, we may properly write Troximon Nutt. 

 (1813) as the name of the present group. 



Perennials: involucre 2.5 to 5 cm. high. 



Achenes abruptly beaked from a broad truncate summit.. ..1. T. retrorsum. 



Achenes tapering into the beak 2. T. plebeium. 



Annual: involucre 1.2 to 1.8 cm. high 3. T. heterophyllum. 



1. T. retrorsum (Benth.) Gray, Proc. Am. Acad. ix. 216 

 (1874). Macrorhynchus retrorsus Benth., PL Hartweg. 320 

 (1849). M. angustifolius Kell., Proc. Calif. Acad. v. 47 (1873) ? 

 Agoseris retrorsa Greene, Pitt. ii. 178 (1891). 



Scapes 1.5 to even 4 dm. high, from a stout perennial taproot : 

 herbage woolly-pubescent when young, the wool deciduous in 

 age : leaves commonly 1 to 2.5 dm. long, sometimes as long as the 

 peduncles, pinnately parted into narrowly linear or lanceolate 

 mostly retrorse segments, the rachis linear and the lobes more or 

 less remote: outer involucral bracts broadly oblong and merely 

 acute ; inner bracts linear and narrowly acuminate, 2.5 to 4 or 5 

 cm. long, about equalling the pappus : ligules short : achenes 5 to 

 6 mm. long, passing abruptly into the slender (18 to 20 mm. long) 

 beak : pappus soft and white. 



On open foothills and in the lower part of the pine belt, 

 usually in loose gravelly soil, from the Cuyamaca Mts., San Diego 

 Co. (and Lower California?), north to Oregon. Not common in 

 Southern California. 



2. T. plebeium Greene, Pitt. ii. 79 (1890). Agoseris plebeia 

 Greene, 1. c. 178 (1891). 



Scapes stout, 2 to 6 dm. high, much exceeding the leaves: 

 herbage short-hirsute or lightly tomentose, glabrate : leaves 1 to 

 2 dm. long, oblong or spatulate in outline, dentate to pinnately 

 parted into linear usually ascending lobes: involucre broad, 2.5 



