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



two forms as regards habit, foliage, or flower, there is no ap- 

 parent reason for assigning specific rank to L. Coulteri. It may 

 be retained as a variety of L. glabrata, however, because of the 

 more conspicuous papillae of its achenes. 



65. BAERIA F. & M. GOLD FIELDS. 



Ours low and mostly slender annuals. Herbage commonly 

 pubescent and often glutinous but never hoary. Leaves opposite, 

 linear, entire or laciniate-pinnatifid. Flowers yellow, the heads 

 on slender peduncles. Involucre campanulate or hemispheric, its 

 bracts as many as the rays, ovate or oblong and becoming more 

 or less carinate below the middle in most species. Receptacle 

 from hemispheric to subulate, usually conical. Ray-flowers 

 mostly 5 to 18 (1 to 4 in B. micro glossa) , pistillate, showy for 

 the size of the heads, or the ligules sometimes very short. Disk- 

 flowers hermaphrodite, their style-branches obtuse and either with 

 or without a minute appendage. Achenes linear, but somewhat 

 broadened upward. Pappus of paleae, or awns, or both, or none. 



All of our species of Baeria, save only the first, which belongs 

 to the monotypic subgenus Burrielia, are very closely related. 

 This relationship is so close that even Doctor Gray's division into 

 three sections, representing the three genera, Baeria, Dichaeta. 

 Ptilomeris, of earlier botanists, is of doubtful value. 44 These 

 genera were based on characters of the pappus, receptacle, and 

 leaves. Pappus characters are entirely unreliable (as I shall dem- 

 onstrate under B. chrysostoma, and B. aristata), several species 

 of Eubaeria and Ptilomeris exhibiting at times the pappus of 

 Dichaeta, while epappose forms may be expected in any species. 

 The receptacle is described as muricate-roughened in Eubaeria 

 and Dichaeta, scrobiculate in Ptilomeris. But the receptacle in 

 every case is covered wtih papillae, each papilla being more or 

 less concave or cup-shaped at summit where it fits around the 

 callous base of its achene. Now, if the papillae are elongated and 

 distinct the receptacle will appear muricate, as is always the case, 

 so far as I am aware, in Eubaeria and Dichaeta ; but, if the pa- 

 pillae are short, thick, and close together, they present a smooth 



44 Of our species, no. 2, belongs to Dr. Gray's Eubaeria; no. 3 to 

 Dichaeta; no. 4 to Ptilomeris. 



