1907] HallCompositae of Southern California. 27 



Plants acaulescent, with simple scapes, the heads therefore solitary and 

 leaves radical. 



Achenes beakless, broad and truncate at summit 



Malocothrix Calif ornica, p. 264. 



Achenes beaked. 



Achenes muricate-roughened above 115. TARAXACUM, p. 272. 



Achenes smooth or 10-ribbed ; the ribs either straight or wavy, but 

 not muricate 119. TEOXIMON, p. 275. 



Achenes flattened: leafy-stemmed plants. 



Achenes beaked 117. LACTUCA, p. 274. 



Achenes truncate, not beaked 116. SONCHUS, p. 272. 



TRIBE 1. EUPATORIEAE. EUPATORY TRIBE. 

 1. HOFMEISTERIA Walp. 



Suffrutescent desert plants. Lower leaves opposite, the upper 

 alternate. Heads medium-sized, long-pedunculate or nearly 

 sessile, many-flowered. Involucre campanulate; bracts narrow, 

 striate, the outer ones successively shorter. Receptacle naked. 

 Achenes 5-angled by the strong nerves, callous-thickened at base. 

 Pappus of 2 to 12 (in ours 10 to 12) scabrous bristles and in 

 addition a series of shorter thin paleae. 



1. H. pluriseta Gray, Pacif. R. Kept. iv. pt. 5, 96, t. 9 (1857). 



Stems decidedly woody, intricately much branched, forming 

 bush-like plants usually 3 to 6 dm. high: herbage glandular- 

 puberulent : leaves 1 to usually 3 cm. long ; petiole flat or canalic- 

 ulate at least toward the base, 1 to 4 cm. long; blade less than 7 

 mm. long, deltoid to lanceolate or linear, acute at apex, tapering 

 at base, entire or with 1 or 2 small teeth, the whole blade often so 

 small as to appear merely as the dilated and flattened tip of the 

 petiole: bracts of the inflorescence linear-subulate: involucre 7 

 to 9 mm. high, about 20-flowered; bracts conspicuously 3-striate, 

 with acuminate often recurved tip: pappus of 10 to 12 bristles 

 equalling or somewhat exceeding the corolla and about as many 

 narrow acute squamellae, the latter sometimes bristle-tipped. 



Rather common in canons of the desert ranges, especially on 

 rocky cliffs and in crevices of rocks : Inyo Mts. ; Palm Canon ; 

 Palm Springs ; Newberry ; Inyo Mts. ; Panamint Mts. ; to Utah 

 and Arizona. 



